Historically, the journey of PV technology has been marked by impressive strides in module cost reductions. Early solar cells, initially relegated to niche applications, gradually became economically viable for widespread electricity generation. These advancements were propelled by intensive research and development, coupled with iterative learning processes that have continuously pushed the boundaries of efficiency and longevity. The trajectory of module costs has followed a steep downward curve, enabling solar energy to rival and increasingly undercut conventional energy sources in price, fostering broader market adoption.

Yet, as PV installations swell into the multi-terawatt realm, a new set of challenges and opportunities emerges. The era of mass deployment demands that the industry not only focus on price and efficiency but also broaden its scope to encompass sustainability, resource consumption, and end-of-life considerations. Large-scale manufacture and deployment necessitate a systemic approach to design for durability, reuse, and recycling, elevating environmental stewardship to a pivotal role alongside economic viability.

Technical innovation remains the engine driving this forward momentum. Contemporary progress in cell and module design exhibits a sharp focus on tandem solar cells—multi-junction configurations that exploit broader segments of the solar spectrum for breakthroughs in conversion efficiency. These tandem devices pave the way for surpassing the efficiency ceilings of traditional single-junction silicon cells, promising a new horizon in power output that aligns perfectly with scaling ambitions.

Moreover, reliability and module lifetime extensions have gained renewed emphasis. The shift toward multi-terawatt-scale deployment means that solar installations will serve as critical infrastructure, where longevity directly impacts economic returns and sustainability metrics. Advances in materials science, encapsulation techniques, and degradation mitigation approaches work synergistically to push module operational lifetimes well beyond previous benchmarks, reducing replacement frequency and the associated environmental burden.

In addition to technical factors, the field acknowledges the escalating need for holistic learning—an integration of knowledge expansion through research, hands-on deployment experience, and collaborative efforts across industry and academia. This multi-dimensional learning framework fosters adaptive strategies that can swiftly respond to emergent challenges such as supply chain constraints, geopolitical considerations, and evolving policy landscapes influential to global PV adoption.

Significantly, the industry’s future is also defined by its carbon footprint and resource consumption patterns. As PV systems become ubiquitous, understanding and minimizing the life cycle greenhouse gas emissions are critical to ensuring that solar power’s net climate benefit remains substantial. Detailed life-cycle assessments guide material selection, manufacturing methods, and system design to optimize environmental performance.

Addressing resource scarcity is another strategic imperative. The widespread use of critical and rare materials in PV technology — such as indium, gallium, and tellurium — presents bottlenecks for raw material availability. Innovations in material substitution, recovery, and recycling technologies are therefore increasingly central in research agendas, aiming to create closed-loop systems that decouple PV growth from finite resource dependence.

Recycling also emerges at the intersection of sustainability and economics. End-of-life PV module management is transitioning from a passive concern to an active field of development, with recycling infrastructure and business models adapting to support the circular economy best practices. This not only mitigates environmental hazards associated with waste but also recovers valuable materials to feed back into production cycles, minimizing overall resource footprint.

The expansive scale of future PV deployment further invites exploration into manufacturing innovations. Automation, high-throughput production techniques, and intelligent supply chain management are vital to meet the quantitative demands without compromising quality or environmental responsibility. Coupling these manufacturing advances with digital tools for monitoring and predictive maintenance enhances system performance and resource efficiency throughout the operational lifespan.

It is also vital to recognize the geopolitical implications tied to the multi-terawatt PV future. Nations rich in raw materials, manufacturing capacity, and technological expertise are poised to influence the direction of global solar energy markets. Collaborative international frameworks and trade policies will play critical roles in ensuring equitable and strategic access to PV technology and components amidst increasing demand.

From a research perspective, the continuous feedback loop of data derived from large-scale PV installations informs iterative improvements in design and deployment strategies. This dynamic process exemplifies the broader concept of “learning” articulated by experts: a composite of scientific discovery, practical experience, and collective knowledge exchange that accelerates progress.

Furthermore, the evolution of PV systems is dovetailing with advancements in energy storage and grid integration technologies. Multi-terawatt solar capacity necessitates sophisticated energy management solutions to balance variable supply with demand, reinforcing the importance of holistic energy system optimization beyond the PV module itself.

Looking forward, the vision for multi-terawatt photovoltaic deployment is one of not only unprecedented scale but also refined sophistication in sustainability, efficiency, and integration. This ongoing transformation reflects a confluence of robust scientific inquiry, innovative engineering, and strategic collaboration aimed at transitioning the planet toward a cleaner and more resilient energy paradigm.

Ultimately, the new era of photovoltaics embodies a commitment to holistic learning—from fundamental science and material innovation to systemic lifecycle management and global cooperation. These intertwined pathways collectively chart a course toward realizing the full promise of solar energy as a cornerstone of the future clean energy economy, with profound impacts on mitigating climate change and fostering sustainable development on a planetary scale.

Subject of Research:
The advancement and scaling of solar photovoltaics technology focusing on cost reduction, performance improvements, sustainability, and multi-terawatt deployment to meet future global energy demands.

Article Title:
Historical and future learning for the new era of multi-terawatt photovoltaics.

Article References:
Alberi, K., Peters, I.M., Verlinden, P. et al. Historical and future learning for the new era of multi-terawatt photovoltaics. Nat Energy (2025). https://doi.org/10.1038/s41560-025-01929-z

Image Credits:
AI Generated

DOI:
https://doi.org/10.1038/s41560-025-01929-z

Hydrogen, a colorless and odorless gas, is increasingly viewed as the fuel of tomorrow, especially for sectors that are difficult to decarbonize through electrification alone. Its high energy density and potential for zero-carbon emissions at the point of use make it a crucial component in ambitions to reduce greenhouse gases. However, the study by Ouyang, Jackson, Saunois, and colleagues unveils that unintentional emissions of hydrogen into the atmosphere during production, storage, and transport might offset some of the environmental benefits currently expected from hydrogen-based energy systems.

One critical insight highlighted by this groundbreaking research is that hydrogen leakage shares a parallel environmental concern with methane emissions from natural gas systems. Both gases have distinct atmospheric chemistries that influence climate and air quality but understanding hydrogen’s role has been historically hindered by limited measurement data. The study takes a rigorous approach to quantify hydrogen leakage despite such data scarcity, advancing our comprehension of the hydrogen cycle on a global scale.

Currently, more than 99% of hydrogen production worldwide is consumed at or near the production site, used primarily for industrial processes such as refining petroleum, producing ammonia, and various chemical syntheses. This localized consumption has led previous analyses to concentrate mainly on leakage at production facilities. However, as hydrogen infrastructure expands and the gas moves into sectors like transportation and power generation, understanding the full leakage footprint becomes imperative.

The researchers estimate the current global hydrogen leakage rate to be around 1%, with an uncertainty range of plus or minus 0.5%, based on synthesis of existing data and advanced modelling techniques. This leakage, though seemingly small in percentage terms, amounts to an estimated 0.7 teragrams per year (700,000 metric tons annually) leaked into the atmosphere from 2010 to 2020. This represents a nontrivial flow of hydrogen with implications for atmospheric chemistry and climate feedbacks.

Hydrogen is highly reactive in the atmosphere, primarily removed through reactions with the hydroxyl radical (OH), a key molecule in controlling the lifespan of many pollutants and greenhouse gases. The introduction of additional hydrogen through leakage disrupts this delicate balance, potentially reducing the atmosphere’s ability to cleanse itself and influencing methane’s atmospheric lifetime. Thereby, hydrogen leakage indirectly exacerbates methane’s greenhouse gas impact, a Warming feedback loop that has been poorly accounted for in current climate models.

This discovery is particularly timely and significant as hydrogen begins to scale in the global energy economy. Increased production and distribution infrastructure, spanning from centralized large-scale factories to decentralized small-scale electrolyzers, increase the number of potential leakage points. Leaks can occur during the electrolysis of water, at pipelines, storage tanks, and vehicle refueling stations, making comprehensive monitoring and mitigation strategies an urgent priority.

Moreover, the study points out that, while hydrogen leakage is currently modest compared to methane emissions from fossil fuels, its proportion could increase as hydrogen use expands. Future energy scenarios leveraging hydrogen heavily must incorporate robust monitoring and regulation to avoid unintended environmental consequences. This necessitates developing new technologies and protocols to detect leaks accurately and to maintain system integrity.

Given that hydrogen molecules are the smallest and lightest, they can escape through materials and joints that are otherwise secure for other gases. This physical property complicates containment efforts and demands innovative engineering solutions tailored specifically to hydrogen’s characteristics. Ensuring safe and environmentally responsible hydrogen deployment will rely on investments in materials science, sensor technologies, and infrastructure upgrades.

An important aspect of the research is the blend of observational data and sophisticated atmospheric chemistry models that enable tracing the fate of hydrogen once released. By constraining hydrogen emissions through a global budget approach, the authors provide policymakers and industry stakeholders with critical insights necessary to balance the benefits of hydrogen energy with responsible environmental stewardship.

This study’s findings underscore the need for integrating hydrogen leakage considerations into the broader climate action framework. As nations set ambitious net-zero emissions targets, accounting for and mitigating hidden emissions from emerging technologies like hydrogen could be the difference between achieving or missing these goals. It also highlights the value of interdisciplinary collaboration, combining atmospheric science, chemical engineering, and energy policy expertise to address complex climate challenges.

In conclusion, while hydrogen continues to hold great promise as a cornerstone of future sustainable energy systems, this new global budget analysis reveals the hidden environmental risks posed by leakage. Recognizing and managing hydrogen emissions at every stage of its lifecycle—from production to end use—is critical to unlocking its potential without undermining climate and air quality objectives. The path forward requires concerted innovation in detection, containment, and regulation mechanisms to ensure that the hydrogen economy grows responsibly and sustainably.

The authors’ comprehensive approach marks a pivotal step in quantifying a previously underappreciated aspect of the hydrogen economy. Their findings not only inform energy and environmental science but also prompt urgent action within industry and regulatory bodies worldwide. As hydrogen moves from niche industrial usage into broader energy systems, the insights from this research will be instrumental in guiding sustainable deployment strategies globally.

This research exemplifies the complexity of transitioning to low-carbon technologies and the imperative of holistic environmental assessments. By shedding light on the nuances of hydrogen leakage, it fosters a more nuanced and realistic understanding of hydrogen’s role in addressing the climate crisis. Through continued innovation and vigilance, the promise of hydrogen to power a cleaner, more sustainable future can be fulfilled—yet only if leakage is recognized and rigorously controlled.

Subject of Research: Hydrogen leakage and its implications on the global hydrogen budget and atmospheric chemistry.

Article Title: The global hydrogen budget.

Article References:
Ouyang, Z., Jackson, R.B., Saunois, M. et al. The global hydrogen budget. Nature 648, 616–624 (2025). https://doi.org/10.1038/s41586-025-09806-1

Image Credits: AI Generated

DOI: 18 December 2025

Hybrid energy storage systems represent a fusion of various storage technologies—such as batteries, supercapacitors, and flywheels—which complement each other’s strengths while compensating for individual limitations. For instance, while batteries offer high energy density, supercapacitors excel in power density and rapid charge-discharge capabilities. The primary challenge in designing HESS lies in precisely balancing these disparate components to meet varying demand profiles, grid conditions, and operational constraints, a multidimensional optimisation problem that defies traditional design methodologies.

What sets this new framework apart is its scenario-adaptive nature. Unlike fixed design paradigms that rely on static assumptions, this approach dynamically adapts to a wide array of plausible future scenarios, including fluctuating energy demands, renewable generation variability, and evolving regulatory standards. By embedding scenario analysis directly into the hierarchical optimisation process, the framework anticipates and mitigates performance bottlenecks before they manifest in real-world applications, thereby ensuring robustness and longevity in HESS design.

The hierarchical optimisation mechanism itself is inherently sophisticated. It decomposes the design problem into interconnected layers, spanning from component-level parameters to system-wide operational strategies. This decomposition allows for an iterative redesign process where localized adjustments propagate upwards, refining global system performance. Such a nested approach contrasts starkly with monolithic models that often overlook emergent properties arising from component interactions, thereby missing opportunities for optimization at the system level.

In practice, the framework leverages advanced algorithmic techniques, such as multi-objective evolutionary algorithms and machine learning-based predictive models. These computational tools enable rapid exploration of the vast design space, evaluating trade-offs between competing objectives such as cost, reliability, efficiency, and response time. The inclusion of machine learning models enhances predictive accuracy by capturing complex nonlinear relationships and temporal dependencies inherent in energy storage dynamics.

One remarkable outcome of this research is the demonstrated ability to tailor HESS design to specific application scenarios, ranging from grid frequency regulation and peak shaving to integration with intermittent renewables like wind and solar. This adaptability is crucial as energy systems evolve towards decentralization and increased participation of distributed energy resources. Whether stabilizing microgrids on remote islands or bolstering urban energy resilience, the adaptable framework provides a customized blueprint for optimal storage integration.

Moreover, the framework’s capacity to incorporate uncertainty quantification transforms conventional risk assessment paradigms. By systematically accounting for uncertainties in technology lifetimes, performance degradation, and future regulatory environments, it supports robust decision-making under ambiguity. This feature is especially beneficial for utilities and policymakers who navigate complex and often conflicting sustainability and reliability mandates.

The implications for economic viability are also profound. Through optimizing component selection and operational management simultaneously, the framework identifies pathways to reduce capital expenditures and operational expenses, thereby accelerating the commercial deployment of hybrid energy storage solutions. In addition, it offers insights into the lifecycle environmental impacts of different configurations, aligning technical innovation with broader sustainability goals.

Crucially, this research addresses scalability, a notorious bottleneck in energy systems design. By modularizing the optimisation process, it accommodates expansions and technology upgrades without necessitating complete redesigns. This forward-compatibility facilitates incremental innovation, allowing stakeholders to progressively enhance energy storage infrastructure as technologies mature and costs decline.

Beyond pure technical sophistication, the framework embodies a paradigm shift towards integrative and anticipatory design in energy storage. It challenges the prevailing siloed approach by fostering interdisciplinary collaboration among materials scientists, system engineers, data scientists, and policy analysts. By merging insights across scales and fields, it cultivates a holistic perspective that is indispensable for addressing the multifaceted challenges of modern energy systems.

The research team validated the framework through extensive simulations and pilot implementations across diverse climatic and grid contexts. These empirical assessments underscore its versatility and practical relevance, highlighting significant improvements in system lifespan, operational flexibility, and cost-effectiveness compared to conventional designs. Such evidence bolsters confidence in its applicability for both emerging and established energy markets.

Looking ahead, this framework lays the groundwork for integrating emerging storage technologies like solid-state batteries, flow batteries, and hydrogen storage into cohesive hybrid systems. Its extensible architecture anticipates future innovations, providing a robust platform to continuously refine design strategies as new materials and architectures come online.

Furthermore, as digitalization and smart grid technologies proliferate, this optimisation framework is primed to exploit real-time data streams and adaptive control techniques. By synchronizing design-time optimisation with runtime monitoring and control, it opens pathways to truly intelligent energy storage systems capable of self-optimizing and responding proactively to grid fluctuations.

In summary, the scenario-adaptive hierarchical optimisation framework devised by Guo, Wu, Ma, and colleagues represents a landmark advancement in the field of hybrid energy storage system design. Integrating robust computational techniques with scenario planning, it offers a versatile and powerful tool that addresses the complex trade-offs inherent in next-generation energy storage. As the global push towards clean energy solutions intensifies, such innovative frameworks will be instrumental in unlocking the full potential of hybrid storage, enabling more resilient, efficient, and economically viable energy systems around the world.

Subject of Research:
Hybrid energy storage system design and optimisation using scenario-adaptive hierarchical frameworks.

Article Title:
Scenario-adaptive hierarchical optimisation framework for design in hybrid energy storage systems.

Article References:
Guo, J., Wu, H., Ma, T. et al. Scenario-adaptive hierarchical optimisation framework for design in hybrid energy storage systems. Nat Commun (2025). https://doi.org/10.1038/s41467-025-67377-1

Image Credits: AI Generated

Among the laureates, Prof. Dr. Stefan Glunz stands out with his visionary project “UltimatePV – Ultimate Photovoltaics,” which aspires to revolutionize solar cell technology. Glunz proposes the development of ultrathin photovoltaic devices using novel photonic structures that markedly enhance optical absorption while drastically reducing material use by an order of magnitude. This innovative approach exploits energy-selective contacts to harness photoexcited charge carriers before they dissipate energy thermally—pushing solar cell efficiency beyond current limits. Such advancements promise to accelerate the energy transition by producing cost-effective, sustainable, and ultra-efficient solar cells.

Prof. Glunz’s dual affiliation with the University of Freiburg’s Department of Sustainable Systems Engineering (INATECH) and the Fraunhofer Institute for Solar Energy Systems ISE facilitates a powerful research synergy. The project also unites European collaborators including EPFL in Switzerland and France’s CNRS, supported further by leading research institutions like CSEM and IPVF. The ERC grant allocated nearly €10 million to this project, with €3.35 million directed to the University of Freiburg.

In another compelling biological challenge, Prof. Dr. Claudine Kraft spearheads the “DegrAbility” project, which dives into the intricacies of autophagy—the cellular process responsible for degrading and recycling protein aggregates. Protein aggregation and clearance are central to cellular health and understanding these pathways holds the key to tackling age-related and neurodegenerative diseases. Kraft’s team interrogates how the interaction between protein aggregates and autophagic machinery determines the fate of these potentially toxic structures, using high-resolution structural biology combined with biochemical reconstitution and cell biology. Their integrative approach is poised to uncover previously unknown regulatory mechanisms that could lead to novel therapeutic strategies to reinstate cellular quality control mechanisms impaired in disease.

Kraft’s research is conducted at the intersection of biochemistry and molecular biology, bolstered by her role as CIBSS spokesperson. International partners bring complementary expertise, creating a formidable team spanning the University of Vienna and the University of California, Berkeley. The project is funded with just under €10 million, of which €3.33 million supports Freiburg’s contribution.

Addressing one of the most aggressive and elusive cancers, junior professor Dr. Çağlar Ataman embarks on the “Zee-Zoom-Zap” project, which devises a cutting-edge theranostic platform for pancreatic cancer. By integrating early diagnostics, non-invasive biopsies, and localized therapies into a single optical endoscopic intervention, this project aspires to transform clinical workflows dramatically. The emphasis is on creating multifunctional optical catheters capable of high-resolution fluorescence imaging and 3D tomographic microscopy inside the pancreatic duct—a previously unattained feat. Utilizing pioneering 3D micro- and nanoprinting methods, Ataman’s team aims to develop clinical-grade, monolithically manufactured endoscopic microscopes, revolutionizing how pancreatic cancer is detected and treated.

Situated within the Department of Microsystems Engineering (IMTEK) at Freiburg, Ataman’s collaboration bridges European expertise from Denmark and Spain, integrating optical engineering with clinical ambitions. The ERC has awarded this initiative €10 million, with Freiburg receiving over €2 million.

The ERC’s support also extends to archaeological sciences through Dr. Susanne Brather-Walter’s involvement in the “CoCo – Connected Communities in Early Medieval Europe” consortium. Challenging the traditional viewpoint that Europe fragmented into isolated ethnic kingdoms after Rome’s fall, this project employs archaeological, anthropological, and genomic methodologies to reconstruct networks of connection across early medieval Europe. Focusing on the extensive distribution of bead artifacts and burial customs, Brather-Walter’s team argues that social ties among ordinary people played a pivotal role in maintaining continental connectivity. This approach rewrites early European history by highlighting grassroots continuity rather than solely focusing on elite narratives.

Brather-Walter, based at Freiburg’s Institute of Archaeology, collaborates with universities from the Netherlands, Italy, the Czech Republic, and Belgium. This expansive consortium has attracted around €11.1 million in ERC funding, with Freiburg’s share being nearly €0.5 million.

Complementing these projects is Prof. Dr. Rüdiger Quay’s “DISRUPT” project at the Fraunhofer Institute for Applied Solid State Physics IAF, which pioneers high-frequency semiconductor technologies designed to slash the energy consumption of future mobile phone networks by half. This research is critical at a time when digital infrastructures underpin global connectivity but contribute substantially to energy demand. Quay’s innovative approach integrates scalable semiconductor device engineering with sustainable systems design, potentially redefining the efficiency of next-generation telecommunications.

Quay holds dual roles at Fraunhofer IAF and the University of Freiburg’s Department of Sustainable Systems Engineering. Collaborations with the Delft University of Technology and University College Dublin strengthen this European research alliance. The project benefits from a €10 million ERC grant, facilitating development towards energy-efficient wireless communication hardware.

Collectively, these four ERC Synergy Grants epitomize the University of Freiburg’s vibrant research ecosystem and its integration into European research networks. With more than €41 million in funding earmarked for these pioneering endeavors and Freiburg receiving a sizeable portion, the university is poised to make transformative contributions to renewable energy, molecular biomedicine, biomedical engineering, early medieval history, and energy-efficient technology.

Prof. Dr. Stefan Rensing, Vice Rector for Research and Innovation, notes that these projects address pressing societal challenges through excellence and interdisciplinarity. Whether it’s combating climate change through solar innovation, unraveling cellular mechanisms to combat neurodegeneration, innovating cancer diagnostics, decoding early European social networks, or enhancing digital sustainability, each project embodies cutting-edge science with global impact.

The wealth of knowledge generated from these initiatives promises not only scientific breakthroughs but also novel technological applications and methodologies, propelling Freiburg and its partners to the forefront of their respective disciplines. This convergence of fundamental inquiry and applied innovation heralds a new era where interdisciplinary synergy catalyzes solutions vital for humanity’s future.

Subject of Research: Renewable energy, molecular biology, biomedical engineering, archaeology, semiconductor technology.

Article Title: University of Freiburg Researchers Secure ERC Synergy Grants for Breakthroughs in Solar Energy, Cellular Biology, Cancer Theranostics, and Early Medieval Europe.

News Publication Date: Not specified.

Web References:

• https://erc.europa.eu/news-events/news/erc-2025-synergy-grants-results
• https://www.iaf.fraunhofer.de/en/media-library/press-releases/erc-synergy-grant.html
• https://www.cibss.uni-freiburg.de/news/erc-synergy-grant-for-prof-dr-claudine-kraft

Image Credits: Photos by Jürgen Gocke / University of Freiburg; photo of Claudine Kraft by CIBSS / University of Freiburg.

Keywords: Alternative energy, Biochemistry, Cancer, Communications.

The comprehensive analysis put forth in recent studies highlights hydrogen production techniques, the economic landscape surrounding these methods, and their application within microgrid operations. A crucial aspect of hydrogen production is its classification into various categories based on the source and method of extraction. Currently, the predominant methods include steam methane reforming, electrolysis, and thermochemical production. Each technique exhibits its unique strengths and weaknesses, thus influencing the decision-making processes among energy producers trying to adopt this versatile fuel.

Steam methane reforming (SMR), a well-established technique, serves as the backbone of current hydrogen production, accounting for over 95% of global output. It primarily utilizes natural gas as a feedstock, combining it with high-temperature steam to yield hydrogen and carbon dioxide. Despite its wide usage, SMR raises environmental concerns due to the substantial CO2 emissions associated with natural gas. This limitation has propelled research towards greener alternatives, particularly within the context of advancing technologies for cleaner hydrogen extraction.

Electrolysis, on the other hand, provides a cleaner, albeit more energy-intensive, alternative. This technique incorporates electrical energy to decompose water into hydrogen and oxygen. When using renewable energy sources, such as solar or wind, electrolysis can produce ‘green hydrogen,’ effectively diminishing the carbon footprint typically linked with hydrogen production. As costs associated with renewable energy technology continue to decline, promising forecasts suggest that electrolysis could emerge as a primary production method in the future.

Thermochemical production makes use of high-temperature heat from nuclear reactors or concentrated solar power to facilitate chemical reactions that yield hydrogen. This method allows for large-scale hydrogen production with improved efficiencies, thereby gaining traction in discussions surrounding sustainable hydrogen energy systems. However, the implementation of thermochemical methods remains limited by technological barriers and the need for improved thermal efficiency ratios.

In exploring the economic aspects, the analysis emphasizes that hydrogen production costs must decrease to remain competitive with traditional fossil fuels. Economic assessments include considerations of capital investments in infrastructure, operational expenditures, and market dynamics. The advent of hydrogen markets, buoyed by government incentives and public-private partnerships, paints an optimistic picture for hydrogen’s economic viability in the near future, especially within the context of energy transition policies aimed at reducing dependency on carbon-intensive fuels.

The application of hydrogen in microgrid systems further exemplifies its potential to enhance energy resilience and sustainability. Microgrid systems can operate independently or in conjunction with the main grid, allowing localized energy production and consumption. Integrating hydrogen into these systems can provide both energy storage and supply during peak demand times or outages. This capability is particularly crucial given the increasing frequency of extreme weather events, pushing energy systems to adapt and maintain reliable service.

Moreover, hydrogen’s role extends beyond just production and usage; its storage characteristics also contribute significantly to modern energy systems. Hydrogen can be stored in several forms, including gaseous and liquid states. Its versatility enables long-term storage solutions that surpass conventional batteries, making it an appealing option for balancing intermittent renewable energy sources such as wind and solar. As energy producers and consumers face the challenge of matching energy supply with fluctuating demand, hydrogen presents a solution that transcends traditional limitations.

Looking toward the future, the integration of hydrogen technologies into microgrid systems signals a significant paradigm shift within energy methodologies. This evolution aligns with global efforts to modernize infrastructure and accommodate clean energy transitions. Nations worldwide are prioritizing investments in hydrogen technologies, aiming to harness local resources to create efficient and sustainable energy ecosystems.

Research continues to explore innovative solutions to surmount existing challenges in hydrogen energy production and integration. Such efforts underscore the urgency to optimize current technologies while fostering pioneering developments that can deploy hydrogen effectively and efficiently. Public and private sector collaboration will be vital in ensuring that technological breakthroughs yield practical results swiftly, thereby accelerating the transition to hydrogen-fueled energy systems.

As the world gears up for a clean energy revolution, hydrogen stands poised to play a transformative role. The exploration of its production techniques, economic implications, and applications within localized energy systems holds promise not only for sustainable growth but also for enhancing energy security. In summary, hydrogen’s journey from a secondary byproduct to a primary energy resource symbolizes humanity’s commitment to a greener future, one powered by innovation and sustainability.

The commitment to understanding and deploying hydrogen comes amid rising global temperatures and the pressing need for cleaner energy alternatives. By fostering a culture of research and development, promising avenues in hydrogen production, storage, and application can be established, reinforcing its presence within the energy landscape. The collaboration between academia and industry will drive this momentum, ultimately resulting in an energy system that balances efficiency, environmental consciousness, and economic viability.

Indeed, as this research on hydrogen energy resources unfolds, it represents a critical juncture for future energy policies and strategies on a global scale. Continued investment in hydrogen production and its integration into microgrid systems will be key components of achieving climate targets. Through proactive measures, stakeholders can ensure that hydrogen not only meets the immediate energy demands but also sets the stage for a sustainable and resilient energy future.

Subject of Research: Hydrogen energy resource production techniques, economy, and application in microgrid systems operation

Article Title: Hydrogen energy resource: overview of production techniques, economy and application in microgrid systems operation

Article References:

Olabode, O.E., Akinyele, D.O., Ariyo, F.K. et al. Hydrogen energy resource: overview of production techniques, economy and application in microgrid systems operation.
Discov Sustain 6, 921 (2025). https://doi.org/10.1007/s43621-025-01833-2

Image Credits: AI Generated

DOI: 10.1007/s43621-025-01833-2

Keywords: Hydrogen energy, production techniques, microgrid systems, sustainability, energy transition.

Hydrogeothermal energy, extracted by tapping into subsurface aquifers heated through geothermal gradients, represents a pivotal chapter in the quest for decarbonizing thermal energy supply. Unlike traditional geothermal power plants that rely predominantly on high enthalpy sources, hydrogeothermal energy typically utilizes moderate temperature water reservoirs to supply heat directly. This approach, while promising, necessitates rigorous evaluation frameworks due to the inherent hydrogeological complexities and operational uncertainties characteristic of subsurface fluid management, reservoir sustainability, and thermal depletion.

Drews and colleagues emphasize the crucial role of multidisciplinary integration in the assessment process, combining geotechnical, hydrological, and thermal engineering perspectives. Their methodology involves constructing detailed risk profiles for hydrogeothermal portfolios, encapsulating variables such as reservoir productivity, scaling tendencies, interference between neighboring wells, and thermal breakthrough timelines. By quantifying these factors, the study advances a predictive capacity to foresee operational lifespan and optimize maintenance schedules, thereby reducing financial exposure.

One particularly innovative aspect of the study lies in its portfolio-based outlook. Instead of evaluating isolated hydrogeothermal installations, Drews et al. advocate for the strategic bundling of multiple projects within a district heating network. This aggregation not only diversifies site-specific risks but also enables dynamic resource allocation, whereby heat extraction can be shifted in response to reservoir performance and community demand fluctuations. Such a holistic perspective is instrumental in overcoming the intermittency and spatial variability inherent in subsurface thermal resources.

The article navigates through the spectrum of geological uncertainties that can undermine hydrogeothermal project success. These include reservoir heterogeneity, fluid salinity impacting well corrosion, and unpredictable thermal gradients that affect the sustainability of heat extraction rates. By incorporating advanced reservoir simulation tools and uncertainty quantification methods, the researchers propose a robust framework to underpin strategic decisions from site selection through operational monitoring.

Environmental considerations emerge as another cornerstone of the study. Drews et al. rigorously evaluate the ecological ramifications of widespread groundwater extraction and reinjection practices. Potential drawbacks such as induced seismicity, subsidence, and contamination are discussed in relation to their likelihood and mitigative engineering controls. The study presents best practices for environmental stewardship, highlighting the balance between maximizing energy output and preserving subsurface integrity.

Financial risk management receives thorough treatment, with the authors detailing innovative contractual mechanisms and insurance products tailored for hydrogeothermal portfolios. Given the upfront capital intensity and prolonged payback periods customary in district heating infrastructures, integrating risk-sharing models between private investors and public stakeholders is portrayed as indispensable. This alignment of incentives fosters greater investment confidence and accelerates project realization timelines.

A notable strength of Drews et al.’s research is their emphasis on adaptive operation strategies enabled by real-time data acquisition and analytics. By deploying sensors and IoT technology throughout the wellfield and distribution networks, operators gain granular visibility into temperature fluctuations, flow rates, and equipment health. Such data-driven insights enable proactive interventions to stave off system degradation and ensure consistent heat delivery to end-users.

In parallel, the study underscores the vital importance of regulatory frameworks that support hydrogeothermal development. They call for streamlined permitting processes, clear environmental compliance standards, and integration with broader urban energy policies. Such governance mechanisms are projected to diminish administrative uncertainties and facilitate scaling of hydrogeothermal portfolios across metropolitan regions.

The authors also contextualize the role of hydrogeothermal district heating within the broader renewable energy ecosystem. By interfacing with other low-carbon technologies, such as solar thermal and waste heat recovery, hydrogeothermal systems can enhance overall grid flexibility and resilience. This synergy not only smooths seasonal demand variations but also provides a robust buffer against fossil fuel disruptions.

To further strengthen risk mitigation, Drews et al. explore the potential for hybrid heat production models combining hydrogeothermal sources with auxiliary boilers or heat pumps. These hybrid configurations offer a pragmatic safety net, ensuring uninterrupted thermal supply even when hydrogeothermal output fluctuates due to reservoir dynamics. This technological complementarity is hailed as key for wide-scale adoption.

Importantly, public acceptance and community engagement receive dedicated consideration within the research. By transparently communicating risks and benefits, involving local stakeholders in planning, and demonstrating the tangible environmental and economic advantages, hydrogeothermal projects can cultivate social license to operate, a critical factor for long-term success.

The comprehensive risk assessment models developed by the team leverage machine learning algorithms to continuously update risk profiles based on operational feedback. This cutting-edge approach enables not only improved predictive accuracy but also facilitates scenario analyses under shifting climate and demand conditions, thereby future-proofing heat portfolios.

Drews and collaborators envision a future where hydrogeothermal district heating evolves into a cornerstone of sustainable urban infrastructure, combining technical rigor, environmental stewardship, and economic viability. Their work provides a valuable blueprint for policymakers, engineers, and investors striving to integrate deep geothermal energy into the clean energy transition effectively.

In conclusion, this landmark study shifts the paradigm from single-project evaluations to robust portfolio management, advocating for multidisciplinary, adaptive, and data-driven strategies to harness hydrogeothermal energy at scale. Its insights are poised to accelerate the global embrace of low-carbon district heating solutions, contributing meaningfully to ambitious climate goals and resilient urban energy systems.

Subject of Research: Hydrogeothermal energy portfolio assessment and risk mitigation strategies for district heating systems.

Article Title: Assessment criteria and risk mitigation of hydrogeothermal energy portfolios for district heating.

Article References:

Drews, M.C., Pfrang, D., Schölderle, F. et al. Assessment criteria and risk mitigation of hydrogeothermal energy portfolios for district heating.
Commun Eng 4, 138 (2025). https://doi.org/10.1038/s44172-025-00478-3

Image Credits: AI Generated

At the heart of this groundbreaking study lies a techno-economic simulation model analyzing low-carbon transitions in electricity, heat, and mobility throughout the UK economy, projected up to 2035. What differentiates this analysis is its comprehensive approach, capturing both direct and indirect effects on labor productivity. By integrating sectoral changes with economy-wide repercussions, the model reveals an overarching multiplier effect: as energy services become cheaper, firms of all kinds experience reduced costs, enhancing operational efficiency and freeing capital for reinvestment and innovation.

Crucially, the research highlights that the full productivity gains depend on the degree to which reductions in energy production costs translate into lower prices for consumers and businesses. Dr. Jean-Francois Mercure, who leads Exeter Climate Policy, emphasizes that current market structures sometimes inhibit this transmission. For example, electricity prices set by the cost of natural gas can sustain elevated prices, limiting the pass-through of savings generated by the falling costs of renewable resources such as wind and solar. Unless these cost savings are effectively passed on, the benefits risk being captured as profits by energy firms and network operators instead of generating broader economic gains.

This nuanced insight warns policymakers that supporting regulatory frameworks must ensure energy market reforms that align pricing mechanisms with underlying production costs. Such reforms would enable the UK economy to harness the full potential of innovation in renewables and electrification technologies, amplifying positive feedback loops between decarbonization and economic growth. Without these interventions, the green transition could contribute less to productivity advancement than it deserves.

Beyond the UK, the study’s implications resonate globally, especially for countries heavily reliant on fossil fuel imports. For these energy importers, the transition presents a unique opportunity to reduce costs and improve competitiveness in a rapidly evolving global marketplace. Dimitri Zenghelis from the University of Cambridge stresses that this dynamic constitutes a global race for competitive advantage, one that the UK cannot afford to sit out. Meanwhile, fossil fuel exporting nations face a complex challenge, needing to diversify their economies swiftly to offset potential economic losses from declining demand for carbon-intensive energy.

The findings decisively challenge the outdated notion that environmental sustainability must come at the expense of economic growth. Economist Hector Pollitt, co-author of the study, asserts that the offshore wind industry in the UK exemplifies how green technologies can drive productivity increases and job creation. Technology, particularly in the green sector, acts as a powerful engine of innovation, disrupting traditional economic assumptions that positioned emissions reduction and growth in opposition.

Underpinning this research is significant support from The Productivity Institute and funding by the UK Economic and Social Research Council, underscoring governmental recognition of the intersection between climate policy and economic productivity. The study, published in the journal Climate Policy, opens fresh avenues for exploration into how low-carbon transitions influence labor productivity through changes in energy supply chains, technology deployment, and economic behavior.

Coinciding with the study’s release is the inauguration of Exeter Climate Policy (ECP), a pioneering research unit launched to bridge the gap between sophisticated climate-economic models and actionable policy. Situated within the University of Exeter, ECP aims to provide governments and finance ministries with tailored economic analyses that reflect local resources, institutional constraints, and socio-political realities. By equipping policymakers with tools to simulate varying green transition scenarios, ECP endeavors to make policy design more resilient and practically oriented toward transformative decarbonization.

Professor Jean-Francois Mercure elaborates on ECP’s mission, emphasizing that each country’s journey to net-zero is unique and complex. Models customized to regional specifics enable stakeholders to visualize policy outcomes before implementation, mitigating risks and improving decision quality. This collaborative and independent body will work closely with governmental and international partners, including the European Commission, the Brazilian Ministry of Finance, and the World Bank, to co-create evidence-based policy interventions crucial in the global climate response.

University of Exeter’s leadership underscores the institution’s commitment to addressing the climate challenge through actionable research and strategic partnerships. Professor Lisa Roberts, President and Vice-Chancellor of Exeter, highlights the university’s Strategy 2030, which prioritizes impactful climate action, echoing the urgency faced by policymakers worldwide. ECP embodies this commitment by translating academic rigor into practical solutions aimed at accelerating a zero-carbon future that is both fair and economically vibrant.

This study and accompanying institutional advancements mark a pivotal step in reconceptualizing the green transition not as a burden but as a catalyst for economic modernization. The research’s comprehensive modeling illuminates how technological innovation in low-carbon energy can serve as a linchpin for broader productivity improvements, reshaping competitive landscapes on multiple scales. These findings present a compelling narrative for integrating economic and environmental objectives to achieve sustainable growth.

Furthermore, the research elucidates the critical importance of market structures and pricing mechanisms in realizing the full benefits of renewable energy. Without structural changes ensuring energy cost savings reach end-users, economic efficiencies generated upstream may remain latent, curtailing the transition’s transformative potential. The policy implications are clear: coordinated regulatory reforms must accompany technology deployment to unlock systemic productivity gains.

In an era where climate commitments increasingly drive economic policy, this study offers a scientifically robust blueprint for reconciling emissions reduction with growth ambitions. By prioritizing sectoral integration and emphasizing economic spillovers, the research lays a foundation for nuanced policymaking that leverages green innovation as a core driver of prosperity. The holistic approach championed by Exeter Climate Policy is poised to shape the next generation of climate-economy modeling and policy design across the globe.

As the UK positions itself at the forefront of this green revolution, academic insights and policy innovation are converging to chart a course toward a sustainable, productive future. The synergy between cheaper renewable energy, smarter market policies, and collaborative international engagement paints an optimistic portrait of an economy thriving while decarbonizing. This research stands as both a call to action and a roadmap for how nations can harness climate strategies to unlock unprecedented economic opportunities.

Subject of Research: The effects of low-carbon transitions on labor productivity in the UK electricity, heat, and transport sectors using techno-economic modelling.

Article Title: The effects of low-carbon transitions on labour productivity: Analysing UK electricity, heat, and mobility with a techno-economic simulation model

News Publication Date: 3-Jul-2025

Web References:
https://exeterclimateforum.com/
https://gsiexeter.co.uk/
https://greenfuturessolutions.com/

References:
“The effects of low-carbon transitions on labour productivity: Analysing UK electricity, heat, and mobility with a techno-economic simulation model.” Climate Policy, 2025.

Keywords: Economics, Carbon emissions, Economic growth

Geothermal energy represents a vital pathway in the transition from fossil fuels to carbon-neutral energy sources. However, one of the significant challenges affecting its widespread acceptance and deployment is the potential for induced seismicity—low-magnitude earthquakes triggered by human interventions such as fluid injection and extraction. The TRIGGER project addresses this challenge by investigating how the injection of cold water into hot rock formations causes thermal stress that alters rock properties like permeability and mechanical strength. These changes subsequently influence the behavior of the geothermal reservoir, including fluid flow and fracture propagation.

The research initiative involves a multidisciplinary consortium of expert groups at Mainz University, including the Volcano Seismology group led by Professor Miriam Christina Reiss, who coordinates the project. Collaborators include teams specializing in Tectonics and Structural Geology, Geodynamics, and Metamorphic Processes. The project also partners with external institutions such as the Institute for Geothermal Resource Management (igem) in Bingen, Ruhr University Bochum, and Microstructure and Pores GmbH (MaP) in Aachen. This collaboration ensures a comprehensive approach, integrating seismology, rock mechanics, geochemistry, and computational modeling to unravel the complexities of geothermal reservoir dynamics.

At the core of TRIGGER’s research lies a fundamental question: how do substantial temperature gradients between injected cold water and native hot rock lead to fracture formation and evolution? This is crucial as fractures control permeability, the parameter dictating how efficiently thermal water can be extracted and reinjected. Understanding fracture dynamics under thermally induced stress changes also sheds light on the mechanisms that might trigger microseismic events, often undetected but potentially cumulative and impactful over time.

Geothermal reservoirs commonly lie deep underground, often beyond 1,500 meters, where temperatures escalates approximately 3 degrees Celsius per 100 meters of depth, or even 5 degrees Celsius per 100 meters in highly active regions such as the Upper Rhine Graben rift system. This pronounced geothermal gradient presents valuable energy that can be harnessed cost-effectively. However, efficient exploitation demands precise knowledge of how thermal contractions and expansions influence rock integrity during cyclic fluid injections, often resulting in temperature fluctuations exceeding 100 degrees Celsius within the reservoir.

Experimentally, the TRIGGER team is conducting elaborate laboratory tests on core samples retrieved from depths of up to 3 kilometers. These samples undergo controlled thermal, mechanical, structural, and chemical analyses to document changes induced by simulated geothermal conditions. Specialized deformation experiments involve injecting cold fluids into preheated rock samples, monitoring in real-time the onset and progression of fracturing using an array of sensitive sensors. Such meticulous characterization at the microstructural level allows researchers to quantify alterations in permeability and mechanical strength under thermal stress.

Complementing these laboratory efforts, complex computer models replicate the physical experiments and extend them to scenarios beyond laboratory constraints. These simulations allow exploration of wider parameter spaces, including variations in rock composition, temperature gradients, and fluid injection rates. This dual approach—integrating empirical data with numerical modeling—enables an unprecedented understanding of geothermal reservoir behavior over longer timescales and greater spatial dimensions, which is otherwise impossible to achieve solely through field studies.

A crucial outcome anticipated from TRIGGER is the identification of long-term impacts of thermal cycling on fracture networks and fluid- rock interactions. This knowledge could inform engineering strategies to optimize injection temperatures and schedules, maximizing heat extraction while mitigating induced seismicity risk. Such insights could pave the way for safer, more efficient geothermal operations, fostering greater public acceptance and facilitating smoother integration into national energy portfolios.

Public perception plays a decisive role in the adoption of geothermal technology. Historically, concerns about earthquakes linked to geothermal activity have hampered development efforts. TRIGGER seeks not only to advance scientific understanding but also to provide empirical evidence that supports responsible geothermal exploitation, thereby strengthening public trust. Germany’s geothermal infrastructure, exemplified by the Insheim power plant supplying renewable electricity for a decade, stands to greatly benefit from this enhanced knowledge base.

The regional specificity of geothermal systems adds complexity to this research. For instance, the Upper Rhine Graben is known for its distinctive tectonic setting and elevated geothermal gradient, making it an ideal natural laboratory. The TRIGGER project’s location at Mainz University situates it strategically close to this geologically active region, enriching the relevance and applicability of its findings. Adjacent initiatives in Rhineland-Palatinate further underscore the growing commitment to geothermal energy, with projects underway in Speyer and Wörth am Rhein.

Professor Miriam Christina Reiss, a rising figure in volcano seismology and geothermal geophysics, brings expertise that bridges fundamental earthquake science and applied geothermal research. Her academic journey—from an interdisciplinary background in English and Physics to doctorate-level seismological research—coupled with international experience at Yale University, fuels this innovative project’s success. Reiss’s vision encompasses not only unravelling the subsurface processes that govern geothermal systems but also translating these insights into actionable strategies for sustainable energy production.

As the TRIGGER project progresses, it is expected to deliver a holistic framework describing thermal fracture generation and evolution within geothermal reservoirs. Such frameworks will integrate microstructural observations, deformation mechanics, fluid dynamics, and seismicity patterns to inform geothermal engineering practices. Ultimately, this could revolutionize how geothermal reservoirs are managed, enhancing energy yields while minimizing environmental impacts.

The stakes extend beyond Germany; the methodologies and findings developed in TRIGGER could serve as a template for geothermal projects worldwide, particularly in regions with similar geological settings. By pushing the envelope in understanding thermally induced rock behavior, TRIGGER positions itself at the forefront of efforts to unlock the full potential of geothermal energy, aligning with global goals for clean, resilient, and sustainable energy systems.

In a world grappling with climate change and energy insecurity, engineering breakthroughs such as those anticipated from the TRIGGER project are indispensable. They fuse scientific rigor with practical urgency, offering hope for a future where earth’s internal heat can be accessed effectively and safely. This endeavor encapsulates the spirit of modern geosciences, blending advanced experimental techniques, computational prowess, and collaborative innovation to steward terrestrial resources responsibly.

Subject of Research: Thermal fracture formation and permeability changes in deep geothermal reservoirs induced by temperature fluctuations.

Article Title: Advancing Geothermal Energy: Unraveling Thermally Induced Fracture Dynamics in Deep Reservoirs

News Publication Date: April 2025

Image Credits: Valentin Koßmann / TRIGGER

Keywords: Geothermal energy, induced seismicity, thermal stress, fracture formation, permeability, deep reservoirs, Upper Rhine Graben, Johannes Gutenberg University Mainz, geothermal modeling, rock mechanics, microstructural analysis, geothermal sustainability

The research team, under the leadership of Dr. Asaf Tzachor, delves into the intricate supply chain of battery minerals, particularly highlighting the dominance of China in this global market. The study provides a comprehensive analysis of the environmental ramifications of battery mineral extraction and processing, emphasizing that particulate pollution is a leading contributor to health issues stemming from this supply chain. Alarmingly, it finds that over 62% of the negative health impacts are tied directly to polluted particulate matter, which significantly overshadows carbon dioxide emissions related to these energy technologies.

Environmental pollution from the mining and processing operations of key battery materials has far-reaching consequences, including respiratory diseases and other public health crises. Researchers warn that the current trajectory of extraction operations—especially rampant in regions with lax environmental regulations—poses serious risks and could negatively affect communities in proximity to mining venues. As such, a concerted effort is required to address these escalating issues before the production of batteries undermines the very benefits they aim to provide.

Dr. Tzachor stresses the urgency of recalibrating how we approach battery production; he asserts that while batteries play an indispensable role in transitioning to renewable energy, we must prioritize addressing their associated health and ecological challenges. Without immediate action, we risk substituting one pressing problem for another, which may incite geopolitical tensions and result in trade barriers affecting critical minerals.

To disrupt the current unsustainable cycle in the battery industry, the researchers propose three strategic avenues for reforming the mineral extraction and processing sectors. The introduction of green energy systems to power mineral extraction activities is paramount. By leveraging renewable energy sources, the carbon footprint associated with these energy-intensive processes would decrease significantly, aligning the extraction of minerals with global climate objectives. Transitioning to cleaner energy sources for mining operations is not merely advantageous; it is essential to foster a more sustainable future.

In addition to transitioning to renewable energy, the study calls for the implementation of tailings backfilling practices to combat land degradation and environmental pollution. Tailings, which are the harmful byproducts generated during the extraction of minerals, often leach toxins into surrounding ecosystems, leading to adverse environmental consequences. By adopting backfilling methods that involve recycling these waste materials back into mined-out areas, the environmental footprint resulting from mining operations could be reduced, helping to restore affected landscapes and mitigate ecological damage.

Furthermore, the researchers underline the significance of circular economy strategies as pivotal measures to minimize dependency on virgin mineral extraction. By promoting recycling and reusing battery materials, the industry can diminish the demand for freshly mined resources—thereby lowering both environmental and economic costs linked to mining activities. The implementation of these strategies not only extends the lifespan of valuable materials but also cultivates a resource-efficient approach that is crucial for the sustainability of the industry.

The findings of the study illustrate the necessity of a systemic overhaul in the way we source the materials essential for battery production. Failing to recognize and address these issues may result in the ongoing perpetuation of environmental devastation and exacerbate existing public health crises. However, by strategically balancing the benefits of energy storage technologies with their associated risks, we can ensure that the transition to clean energy is genuinely sustainable—not only for our planet but for the well-being of its people.

As the situation evolves, it becomes increasingly clear that more rigorous research and comprehensive policies are essential to harness the full potential of battery technologies while safeguarding our environment. The Yannay Institute for Energy Security serves as a pivotal space for exploring and implementing solutions aimed at addressing these challenges, while also fostering interdisciplinary collaboration among experts in various fields.

Through continued research efforts, the institute aims to uncover innovative solutions to the pressing global challenges surrounding energy security. It is imperative for scholars and industry leaders alike to remain vigilant and proactive in addressing these complex issues. The interplay between technology, environmental impact, and human health should guide our approach toward a more sustainable future. By framing discussions around energy storage in terms of ecological and public health implications, we can better inform policy decisions that affect both current and future generations.

Ultimately, the advancement of battery technologies should not come at the cost of environmental degradation or human suffering. We must advocate for a responsible transition to clean energy by prioritizing sustainable practices across the entire supply chain of battery production, ensuring that the aspirations of clean energy transition do not result in unforeseen consequences. The insights offered through this research lay the groundwork for future explorations into how we can sustainably meet energy demands, fostering an industry that benefits both the environment and society as a whole.

Subject of Research: Not applicable
Article Title: Assessing the environmental impacts associated with China’s battery minerals and technologies
News Publication Date: 1-Jan-2025
Web References: 10.1016/j.resconrec.2024.107978
References: Not applicable
Image Credits: Oz Schechter
Keywords: Environmental issues, Sustainable energy, Batteries, Risk factors, Environmental economics, Environmental methods, Power industry