Solar Plus Battery Storage Cheaper Than Conventional Power in Germany


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Germany Solar-Plus-Storage Cost Parity signals grid parity as solar power with battery storage undercuts conventional electricity. Falling LCOE, policy incentives, and economies of scale accelerate the energy transition and decarbonization across Germany's power market.

 

Key Points

The point at which solar power with battery storage is cheaper than conventional grid electricity across Germany.

✅ Lower LCOE from tech advances and economies of scale

✅ EEG incentives and streamlined installs cut total costs

✅ Enhances energy security, reduces fossil fuel dependence

 

Germany, a global leader in renewable energy adoption, with clean energy supplying about half of its electricity in recent years, has reached a significant milestone: the cost of solar power combined with battery storage has now fallen below that of conventional electricity sources. This development marks a transformative shift in the energy landscape, showcasing the increasing affordability and competitiveness of renewable energy technologies and reinforcing Germany’s position as a pioneer in the transition to sustainable energy.

The decline in costs for solar power paired with battery storage represents a breakthrough in Germany’s energy sector, especially amid the recent solar power boost during the energy crisis, where the transition from traditional fossil fuels to cleaner alternatives has been a central focus. Historically, conventional power sources such as coal, natural gas, and nuclear energy have dominated electricity markets due to their established infrastructure and relatively stable pricing. However, the rapid advancements in solar technology and energy storage solutions are altering this dynamic, making renewable energy not only environmentally preferable but also economically advantageous.

Several factors contribute to the cost reduction of solar power with battery storage:

  1. Technological Advancements: The technology behind solar panels and battery storage systems has evolved significantly over recent years. Solar panel efficiency has improved, allowing for greater energy generation from smaller installations. Similarly, cheaper batteries have advanced, with reductions in cost and increases in energy density and lifespan. These improvements mean that solar installations can produce more electricity and store it more effectively, enhancing their economic viability.

  2. Economies of Scale: As demand for solar and battery storage systems has grown, manufacturers have scaled up production, leading to economies of scale. This scaling has driven down the cost of both solar panels and batteries, making them more affordable for consumers. As the market for these technologies expands, prices are expected to continue decreasing, further enhancing their competitiveness.

  3. Government Incentives and Policies: Germany’s commitment to renewable energy has been supported by robust government policies and incentives. The country’s Renewable Energy Sources Act (EEG) and other supportive measures, alongside efforts to remove barriers to PV in Berlin that could accelerate adoption, have provided financial incentives for the adoption of solar power and battery storage. These policies have encouraged investment in renewable technologies and facilitated their integration into the energy market, contributing to the overall reduction in costs.

  4. Falling Installation Costs: The cost of installing solar power systems and battery storage has decreased as the industry has matured. Advances in installation techniques, increased competition among service providers, and streamlined permitting processes have all contributed to lower installation costs. This reduction in upfront expenses has made solar with battery storage more accessible and financially attractive to both residential and commercial consumers.

The economic benefits of solar power with battery storage becoming cheaper than conventional power are substantial. For consumers, this shift translates into lower electricity bills and reduced reliance on fossil fuels. Solar installations with battery storage allow households and businesses to generate their own electricity, store it for use during times of low sunlight, and even sell excess power back to the grid, reflecting how solar is reshaping electricity prices in Northern Europe as markets adapt. This self-sufficiency reduces exposure to fluctuating energy prices and enhances energy security.

For the broader energy market, the decreasing cost of solar power with battery storage challenges the dominance of conventional power sources. As renewable energy becomes more cost-effective, it creates pressure on traditional energy providers to adapt and invest in cleaner technologies, including responses to instances of negative electricity prices during renewable surpluses. This shift can accelerate the transition to a low-carbon energy system and contribute to the reduction of greenhouse gas emissions.

Germany’s achievement also has implications for global energy markets. The country’s success in making solar with battery storage cheaper than conventional power serves as a model for other nations pursuing similar energy transitions. As the cost of renewable technologies continues to decline, other countries can leverage these advancements to enhance their own energy systems, reduce carbon emissions, and achieve energy independence amid over 30% of global electricity now from renewables trends worldwide.

The impact of this development extends beyond economics. It represents a significant step forward in addressing climate change and promoting sustainability. By reducing the cost of renewable energy technologies, Germany is accelerating the shift towards a cleaner and more resilient energy system. This progress aligns with the country’s ambitious climate goals and reinforces its role as a leader in global efforts to combat climate change.

Looking ahead, several challenges remain. The integration of renewable energy into existing energy infrastructure, grid stability, and the management of energy storage are all areas that require continued innovation and investment. However, the decreasing cost of solar power with battery storage provides a strong foundation for addressing these challenges and advancing the transition to a sustainable energy future.

In conclusion, the fact that solar power with battery storage in Germany has become cheaper than conventional power is a groundbreaking development with wide-ranging implications. It underscores the technological advancements, economic benefits, and environmental gains associated with renewable energy technologies. As Germany continues to lead the way in clean energy adoption, this achievement highlights the potential for renewable energy to drive global change and reshape the future of energy.

 

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Philippines Reaffirms Clean Energy Commitment at APEC Summit

Philippines Clean Energy Commitment underscores APEC-aligned renewables, energy transition, and climate resilience, backed by policy incentives, streamlined regulation, technology transfer, and public-private investments to boost energy security, jobs, and sustainable growth.

 

Key Points

It is the nation's pledge to scale renewables and build climate resilience through APEC-aligned energy policy.

✅ Policy incentives, PPPs, and streamlined permits

✅ Grid upgrades, storage, and smart infrastructure

✅ Regional cooperation on tech transfer and capacity building

 

At the recent Indo-Pacific Economic Cooperation (APEC) Summit, the Philippines reiterated its dedication to advancing clean energy initiatives as part of its sustainable development agenda. This reaffirmation underscores the country's commitment to mitigating climate change impacts, promoting energy security, and fostering economic resilience through renewable energy solutions, with insights from an IRENA study on the power crisis informing policy direction.

Strategic Goals and Initiatives

During the summit, Philippine representatives highlighted strategic goals aimed at enhancing clean energy adoption and sustainability practices. These include expanding renewable energy infrastructure, accelerating energy transition efforts toward 100% renewables targets, and integrating climate resilience into national development plans.

Policy Framework and Regulatory Support

The Philippines has implemented a robust policy framework to support clean energy investments and initiatives. This includes incentives for renewable energy projects, streamlined regulatory processes, and partnerships with international stakeholders, such as ADFD-IRENA funding initiatives, to leverage expertise and resources in advancing sustainable energy solutions.

Role in Regional Cooperation

As an active participant in regional economic cooperation, the Philippines collaborates with APEC member economies to promote knowledge sharing, technology transfer, and capacity building in renewable energy development, as over 30% of global electricity is now generated from renewables, reinforcing the momentum. These partnerships facilitate collective efforts to address energy challenges and achieve mutual sustainability goals.

Economic and Environmental Benefits

Investing in clean energy not only reduces greenhouse gas emissions but also stimulates economic growth and creates job opportunities in the renewable energy sector. The Philippines recognizes the dual benefits of transitioning to cleaner energy sources, with projects like the Aboitiz geothermal financing award illustrating private-sector momentum, contributing to long-term economic stability and environmental stewardship.

Challenges and Opportunities

Despite progress, the Philippines faces challenges such as energy access disparities, infrastructure limitations, and financing constraints in scaling up clean energy projects, amid regional signals like India's solar slowdown and coal resurgence that underscore transition risks. Addressing these challenges requires innovative financing mechanisms, public-private partnerships, and community engagement to ensure inclusive and sustainable development.

Future Outlook

Moving forward, the Philippines aims to accelerate clean energy deployment through strategic investments, technology innovation, and policy coherence, aligning with the U.S. clean energy market trajectory toward majority share to capture emerging opportunities. Embracing renewable energy as a cornerstone of its economic strategy positions the country to attract investments, enhance energy security, and achieve resilience against global energy market fluctuations.

Conclusion

The Philippines' reaffirmation of its commitment to clean energy at the APEC Summit underscores its leadership in promoting sustainable development and addressing climate change challenges. By prioritizing renewable energy investments and fostering regional cooperation, the Philippines aims to build a resilient energy infrastructure that supports economic growth and environmental sustainability. As the country continues to navigate its energy transition journey, collaboration and innovation will be key in realizing a clean energy future that benefits present and future generations.

 

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Fixing California's electric grid is like repairing a car while driving

CAISO Clean Energy Transition outlines California's path to 100% carbon-free power by 2045, scaling renewables, battery storage, and offshore wind while safeguarding grid reliability, managing natural gas, and leveraging Western markets like EDAM.

 

Key Points

CAISO Clean Energy Transition is the plan to reach 100% carbon-free power by 2045 while maintaining grid reliability.

✅ Target: add 7 GW/year to reach 120 GW capacity by 2045

✅ Battery storage up 30x; smooths intermittent solar and wind

✅ EDAM and WEIM enhance imports, savings, and reliability

 

Mark Rothleder, Chief Operating Officer and Senior Vice President at the California Independent System Operator (CAISO), which manages roughly 80% of California’s electric grid, has expressed cautious optimism about meeting the state's ambitious clean energy targets while keeping the lights on across the grid. However, he acknowledges that this journey will not be without its challenges.

California aims to transition its power system to 100% carbon-free sources by 2045, ensuring a reliable electricity supply at reasonable costs for consumers. Rothleder, aware of the task's enormity, likens it to a complex car repair performed while the vehicle is in motion.

Recent achievements have demonstrated California's ability to temporarily sustain its grid using clean energy sources. According to Rothleder, the real challenge lies in maintaining this performance round the clock, every day of the year.

Adding thousands of megawatts of renewable energy into California’s existing 50-gigawatt system, which needs to expand to 120 gigawatts to meet the 2045 goal, poses a significant challenge, though recent grid upgrade funding offers some support for needed infrastructure. CAISO estimates that an addition of 7 gigawatts of clean power per year for the next two decades is necessary, all while ensuring uninterrupted power delivery.

While natural gas currently constitutes California's largest single source of power, Rothleder notes the need to gradually decrease reliance on it, even as it remains an operational necessity in the transition phase.

In 2023, CAISO added 5,660 megawatts of new power to the grid, with plans to integrate over 1,100 additional megawatts in the next six to eight months of 2024. Battery storage, crucial for mitigating the intermittent nature of wind and solar power, has seen substantial growth as California turns to batteries for grid support, increasing 30-fold in three years.

Rothleder emphasizes that electricity reliability is paramount, as consumers always expect power availability. He also highlights the potential of offshore wind projects to significantly contribute to California's power mix by 2045.

The offshore wind industry faces financial and supply chain challenges despite these plans. CAISO’s 20-year outlook indicates a significant increase in utility-scale solar, requiring extensive land use and wider deployment of advanced inverters for grid stability.

Addressing affordability is vital, especially as California residents face increasing utility bills. Rothleder suggests a broader energy cost perspective, encompassing utility and transportation expenses.

Despite smooth grid operations in 2023, challenges in previous years, including extreme weather-induced power outages driven by climate change, underscore the need for a robust, adaptable grid. California imports about a quarter of its power from neighbouring states and participates in the Western Energy Imbalance Market, which has yielded significant savings.

CAISO is also working on establishing an extended day-ahead electricity market (EDAM) to enhance the current energy market's success, building on insights from a Western grid integration report that supports expanded coordination.

Rothleder believes that a thoughtfully designed, diverse power system can offer greater reliability and resilience in the long run. A future grid reliant on multiple, smaller power sources such as microgrids could better absorb potential losses, ensuring a more reliable electricity supply for California.

 

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Finland Investigates Russian Ship After Electricity Cable Damage

Finland Shadow Fleet Cable Investigation details suspected Russia-linked sabotage of Baltic Sea undersea cables, AIS dark activity, and false-flag tactics threatening critical infrastructure, prompting NATO and EU vigilance against hybrid warfare across Northern Europe.

 

Key Points

Finland probes suspected sabotage of undersea cables by a Russia-linked vessel using flag of convenience and AIS off.

✅ Undersea cable damage in Baltic Sea sparks security alerts

✅ Suspected shadow fleet ship ran AIS dark under false flag

✅ NATO and EU boost maritime surveillance, critical infrastructure

 

In December 2024, Finland launched an investigation into a ship allegedly linked to Russia’s “shadow fleet” following a series of incidents involving damage to undersea cables. The investigation has raised significant concerns in Finland and across Europe, as it suggests possible sabotage or other intentional acts related to the disruption of vital communication and energy infrastructure in the Baltic Sea region. This article explores the key details of the investigation, the role of Russia’s shadow fleet, and the broader geopolitical implications of this event.

The "Shadow Fleet" and Its Role

The term “shadow fleet” refers to a collection of ships, often disguised or operating under false flags, that are believed to be part of Russia's covert maritime operations. These vessels are typically used for activities such as smuggling, surveillance, and potentially military operations, mirroring the covert hacker infrastructure documented by researchers in related domains. In recent years, the "shadow fleet" has been under increasing scrutiny due to its involvement in various clandestine actions, especially in regions close to NATO member countries and areas with sensitive infrastructure.

Russia’s "shadow fleet" operates in the shadows of regular international shipping, often difficult to track due to the use of deceptive practices like turning off automatic identification systems (AIS). This makes it difficult for authorities to monitor their movements and assess their true purpose, raising alarm bells when one of these ships is suspected of being involved in damaging vital infrastructure like undersea cables.

The Cable Damage Incident

The investigation was sparked after damage was discovered to an undersea cable in the Baltic Sea, a vital link for communication, data transmission, and energy supply between Finland and other parts of Europe. These undersea cables are crucial for everything from internet connections to energy grid stability, with recent Nordic grid constraints underscoring their importance, and any disruption to them can have serious consequences.

Finnish authorities reported that the damage appeared to be deliberate, raising suspicions of potential sabotage. The timing of the damage coincides with a period of heightened tensions between Russia and the West, particularly following the escalation of the war in Ukraine, with recent strikes on Ukraine's power grid highlighting the stakes, and ongoing geopolitical instability. This has led many to speculate that the damage to the cables could be part of a broader strategy to undermine European security and disrupt critical infrastructure.

Upon further investigation, a vessel that had been in the vicinity at the time of the damage was identified as potentially being part of Russia’s "shadow fleet." The ship had been operating under a false flag and had disabled its AIS system, making it challenging for authorities to track its movements. The vessel’s activities raised red flags, and Finnish authorities are now working closely with international partners to ascertain its involvement in the incident.

Geopolitical Implications

The damage to undersea cables and the suspected involvement of Russia’s "shadow fleet" have broader geopolitical implications, particularly in the context of Europe’s security landscape. Undersea cables are considered critical infrastructure, akin to electric utilities where intrusions into US control rooms have been documented, and any deliberate attack on them could be seen as an act of war or an attempt to destabilize regional security.

In the wake of the investigation, there has been increased concern about the vulnerability of Europe’s energy and communication networks, which are increasingly reliant on these undersea connections, and as the Baltics pursue grid synchronization with the EU to reduce dependencies, policymakers are reassessing resilience measures. The European Union, alongside NATO, has expressed growing alarm over potential threats to this infrastructure, especially as tensions with Russia continue to escalate.

The incident also highlights the growing risks associated with hybrid warfare tactics, which combine conventional military actions with cyberattacks, including the U.S. condemnation of power grid hacking as a cautionary example, sabotage, and disinformation campaigns. The targeting of undersea cables could be part of a broader strategy by Russia to disrupt Europe’s ability to coordinate and respond effectively, particularly in the context of ongoing sanctions and diplomatic pressure.

Furthermore, the suspected involvement of a "shadow fleet" ship raises questions about the transparency and accountability of maritime activities in the region. The use of vessels operating under false flags or without identification systems complicates efforts to monitor and regulate shipping in international waters. This has led to calls for stronger maritime security measures and greater cooperation between European countries to ensure the safety and integrity of critical infrastructure.

Finland’s Response and Ongoing Investigation

In response to the cable damage incident, Finnish authorities have mobilized a comprehensive investigation, seeking to determine the extent of the damage and whether the actions were deliberate or accidental. The Finnish government has called for increased vigilance and cooperation with international partners to identify and address potential threats to undersea infrastructure, drawing on Symantec's Dragonfly research for insights into hostile capabilities.

Finland, which shares a border with Russia and has been increasingly concerned about its security in the wake of Russia's invasion of Ukraine, has ramped up its defense posture. The damage to undersea cables serves as a stark reminder of the vulnerabilities that come with an interconnected global infrastructure, and Finland’s security services are likely to scrutinize the incident as part of their broader defense strategy.

Additionally, the incident is being closely monitored by NATO and the European Union, both of which have emphasized the importance of safeguarding critical infrastructure. As an EU member and NATO partner, Finland’s response to this situation could influence how Europe addresses similar challenges in the future.

The investigation into the damage to undersea cables in the Baltic Sea, allegedly linked to Russia’s "shadow fleet," has significant implications for European security. The use of covert operations, including the deployment of ships under false flags, underscores the growing threats to vital infrastructure in the region. With tensions between Russia and the West continuing to rise, the potential for future incidents targeting critical communication and energy networks is a pressing concern.

As Finland continues its investigation, the incident highlights the need for greater international cooperation and vigilance in safeguarding undersea cables and other critical infrastructure. In a world where hybrid warfare tactics are becoming increasingly common, ensuring the security of these vital connections will be crucial for maintaining stability in Europe. The outcome of this investigation may serve as a crucial case study in the ongoing efforts to protect infrastructure from emerging and unconventional threats.

 

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The Need for Electricity During the COVID-19 Pandemic

US utilities COVID-19 resilience shows electric utilities maintaining demand stability, reaffirming earnings guidance, and accessing the bond market for low-cost financing, as Dominion, NextEra, and Con Edison manage recession risks.

 

Key Points

It is the sector's capacity to sustain demand, financing access, and guidance despite pandemic recession pressures.

✅ Bond market access locks in low-cost, long-term debt

✅ Stable residential load offsets industrial weakness

✅ Guidance largely reaffirmed by major utilities

 

Dominion Energy (D) expects "incremental residential load" gains, consistent with COVID-19 electricity demand patterns, as a result of COVID-19 fallout. Southern Company CEO Tom Fanning says his company is "nowhere near" a need to review earnings guidance because of a potential recession, in a region where efficiency and demand response can help level electricity demand for years.

Sempra Energy (SRE) has reaffirmed earnings per share guidance for 2020 and 2021, as well timing for the sale of assets in Chile and Peru, and peers such as Duke Energy's renewables plan have reaffirmed capital investments to deliver cleaner energy and economic growth. And Xcel Energy (XEL) says it still "hasn’t seen material impact on its business."

Several electric utilities have demonstrated ability to tap the bond market, in line with utility sector trends in recent years, to lock in low-cost financing, as America moves toward broader electrification, despite ongoing turmoil. Their ranks include Dominion Energy, renewable energy leader NextEra Energy (NEE) and Consolidated Edison (ED), which last week sold $1 billion of 30-year bonds at a coupon rate of just 3.95 percent.

It’s still early days for US COVID-19 fallout. And most electric companies have yet to issue guidance. That’s understandable, since so much is still unknown about the virus and the damage it will ultimately do to human health and the global economy. But so far, the US power industry is showing typical resilience in tough times, as it coordinates closely with federal partners to maintain reliability.

Will it last? We won’t know for certain until there’s a lot more data. NextEra is usually first to report its Q1 earnings reports and detailed guidance. But that’s not expected until April 23. And companies may delay financials further, should the virus and efforts to control it impede collection and analysis of data, and as they address electricity shut-off risks affecting customers.

 

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Ukraine Helps Spain Amid Blackouts

Ukraine-Spain Power Aid highlights swift international solidarity as Kyiv offers grid restoration expertise to Spain after unprecedented blackouts, aiding energy infrastructure recovery, interconnectors, and emergency response while operators restore power across Spain and Portugal.

 

Key Points

Ukraine sends grid experts to help Spain recover from blackouts, restore power, and reinforce energy infrastructure.

✅ Ukraine offers grid restoration expertise and emergency support.

✅ Partial power restored; cause of blackouts under investigation.

✅ EU funding and Ukrenergo bolster infrastructure resilience.

 

In a remarkable display of international solidarity, Ukraine has extended assistance to Spain as the country grapples with widespread power outages. On April 28, 2025, Spain and neighboring Portugal experienced unprecedented blackouts that disrupted daily life, including internet connectivity and subway operations. The two nations declared a state of emergency as they worked to restore power.

Ukraine's Offer of Assistance

In response to the crisis, Ukrainian President Volodymyr Zelensky reached out to Spanish Prime Minister Pedro Sánchez, offering support to help restore Spain's power grid. Zelensky emphasized Ukraine's extensive experience in managing energy challenges, particularly in fighting to keep the lights on during sustained Russian attacks on its energy infrastructure. He instructed Ukraine’s Energy Minister, Herman Haluschchenko, to mobilize technical experts to assist Spain swiftly. As of April 29, grid operators in both Spain and Portugal reported partial restoration of power, with recovery efforts ongoing. Authorities continue to investigate the cause of the outages. 

Ukraine's Energy Crisis: A Background

Ukraine's offer of assistance is particularly poignant given its own recent struggles with energy security. Throughout 2024, Russia launched numerous aerial strikes targeting Ukraine's energy infrastructure, including strikes on western Ukraine that severely damaged power generation facilities and transmission networks. These attacks led to significant challenges during the winter season, including widespread blackouts and difficulties in heating households, prompting efforts to keep the lights on this winter across the country. Despite these adversities, Ukraine managed to navigate the winter without major power shortages, thanks to rapid repairs and the resilience of its energy sector. 

International Support for Ukraine

The international community has played a crucial role in supporting Ukraine's energy sector, even as U.S. support for grid restoration has shifted, with continued aid from European partners. In July 2024, the European Union allocated nearly $110 million through the KfW Development Bank to modernize high-voltage substations and develop interconnectors with continental Europe's power system. This funding has been instrumental in repairing and restoring equipment damaged by Russian attacks and enhancing the protection of Ukraine's substations. Since the onset of the conflict, Ukraine's energy grid operator, Ukrenergo, has received international assistance totaling approximately €1.5 billion. 

A Gesture of Solidarity

Ukraine's offer to assist Spain underscores the deepening ties between the two nations and reflects a broader spirit of international cooperation. While Spain continues its recovery efforts, the support from Ukraine serves as a reminder of the importance of solidarity, and of Ukraine's electricity reserves that help prevent further outages in times of crisis. As both countries work towards restoring and securing their energy infrastructures, their collaboration highlights the shared challenges and mutual support that define the European community.

Ukraine's proactive stance in offering assistance to Spain amidst the recent blackouts exemplifies the strength of international partnerships and the shared commitment to new energy solutions that overcome energy challenges. As the situation develops, the continued cooperation between nations will be pivotal in ensuring energy security and resilience as winter looms over Ukraine once more.

 

 

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Scientists Built a Genius Device That Generates Electricity 'Out of Thin Air'

Air-gen Protein Nanowire Generator delivers clean energy by harvesting ambient humidity via Geobacter-derived conductive nanowires, generating continuous hydrovoltaic electricity through moisture gradients, electrodes, and proton diffusion for sustainable, low-waste power in diverse climates.

 

Key Points

A device using Geobacter protein nanowires to harvest humidity, producing continuous DC power via proton diffusion.

✅ 7 micrometer film between electrodes adsorbs water vapor.

✅ Output: ~0.5 V, 17 uA/cm2; stack units to scale power.

✅ Geobacter optimized via engineered E. coli for mass nanowires.

 

They found it buried in the muddy shores of the Potomac River more than three decades ago: a strange "sediment organism" that could do things nobody had ever seen before in bacteria.

This unusual microbe, belonging to the Geobacter genus, was first noted for its ability to produce magnetite in the absence of oxygen, but with time scientists found it could make other things too, like bacterial nanowires that conduct electricity.

For years, researchers have been trying to figure out ways to usefully exploit that natural gift, and they might have just hit pay-dirt with a device they're calling the Air-gen. According to the team, their device can create electricity out of… well, almost nothing, similar to power from falling snow reported elsewhere.

"We are literally making electricity out of thin air," says electrical engineer Jun Yao from the University of Massachusetts Amherst. "The Air-gen generates clean energy 24/7."

The claim may sound like an overstatement, but a new study by Yao and his team describes how the air-powered generator can indeed create electricity with nothing but the presence of air around it. It's all thanks to the electrically conductive protein nanowires produced by Geobacter (G. sulfurreducens, in this instance).

The Air-gen consists of a thin film of the protein nanowires measuring just 7 micrometres thick, positioned between two electrodes, referencing advances in near light-speed conduction in materials science, but also exposed to the air.

Because of that exposure, the nanowire film is able to adsorb water vapour that exists in the atmosphere, offering a contrast to legacy hydropower models, enabling the device to generate a continuous electrical current conducted between the two electrodes.

The team says the charge is likely created by a moisture gradient that creates a diffusion of protons in the nanowire material.

"This charge diffusion is expected to induce a counterbalancing electrical field or potential analogous to the resting membrane potential in biological systems," the authors explain in their study.

"A maintained moisture gradient, which is fundamentally different to anything seen in previous systems, explains the continuous voltage output from our nanowire device."

The discovery was made almost by accident, when Yao noticed devices he was experimenting with were conducting electricity seemingly all by themselves.

"I saw that when the nanowires were contacted with electrodes in a specific way the devices generated a current," Yao says.

"I found that exposure to atmospheric humidity was essential and that protein nanowires adsorbed water, producing a voltage gradient across the device."

Previous research has demonstrated hydrovoltaic power generation using other kinds of nanomaterials – such as graphene-based systems now under study – but those attempts have largely produced only short bursts of electricity, lasting perhaps only seconds.

By contrast, the Air-gen produces a sustained voltage of around 0.5 volts, with a current density of about 17 microamperes per square centimetre, and complementary fuel cell solutions can help keep batteries energized, with a current density of about 17 microamperes per square centimetre. That's not much energy, but the team says that connecting multiple devices could generate enough power to charge small devices like smartphones and other personal electronics – concepts akin to virtual power plants that aggregate distributed resources – all with no waste, and using nothing but ambient humidity (even in regions as dry as the Sahara Desert).

"The ultimate goal is to make large-scale systems," Yao says, explaining that future efforts could use the technology to power homes via nanowire incorporated into wall paint, supported by energy storage for microgrids to balance supply and demand.

"Once we get to an industrial scale for wire production, I fully expect that we can make large systems that will make a major contribution to sustainable energy production."

If there is a hold-up to realising this seemingly incredible potential, it's the limited amount of nanowire G. sulfurreducens produces.

Related research by one of the team – microbiologist Derek Lovley, who first identified Geobacter microbes back in the 1980s – could have a fix for that: genetically engineering other bugs, like E. coli, to perform the same trick in massive supplies.

"We turned E. coli into a protein nanowire factory," Lovley says.

"With this new scalable process, protein nanowire supply will no longer be a bottleneck to developing these applications."

 

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