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Raindrop Triboelectric Energy Harvesting converts falling water into electricity using Teflon (PTFE) on indium tin oxide and an aluminum electrode, forming a transient water bridge; a low frequency nanogenerator for renewable, static electricity harvesting.

Key Points

A method using PTFE, ITO, and an aluminum electrode to turn raindrop impacts into low frequency electrical power.

✅ PTFE on ITO boosts charge transfer efficiency.

✅ Water bridge links electrodes for rapid discharge.

✅ Low frequency output suits continuous energy harvesting.

Scientists at the City University of Hong Kong have used a Teflon-coated surface and a phenomenon called triboelectricity to generate a charge from raindrops. “Here we develop a device to harvest energy from impinging water droplets by using an architecture that comprises a polytetrafluoroethylene [Teflon] film on an indium tin oxide substrate plus an aluminium electrode,” they explain in their new paper in Nature as a step toward cheap, abundant electricity in the long term.

Triboelectricity itself is an old concept. The word means “friction electricity”—from the Greek tribo, to rub or wear down, which is why a diatribe tires you out—and dates back a long, long time. Static electricity is the most famous kind of triboelectric, and related work has shown electricity from the night sky can be harvested as well in niche setups. In most naturally occurring kinds, scientists have studied triboelectric in order to avoid its effects, like explosions inside of grain silos or hospital workers touching off pure oxygen. (Blowing sand causes an electric field, and NASA even worries about static when astronauts eventually land on Mars.)

One of the most studied forms of intentional and useful triboelectric is in systems such as ocean wave generators where the natural friction of waves meets nanogenerators of triboelectric energy. These even already use Teflon, which has natural conductivity that makes it ideal for this job. But triboelectricity is chaotic, and harnessing it generally involves a bunch of complicated, intersecting variables that can vary with the hourly weather. Promises of static electricity charging devices have often been, well, so much hot, sandy wind.

The scientists at City University of Hong Kong used triboelectric ideas to turn falling raindrops into energy. They say previous versions of the same idea were not very efficient, with materials that didn’t allow for high-fidelity transfer of electrical charge. (Many sources of renewable energy aren’t yet as efficient to turn into power, both because of developing technology and because their renewability means even less efficient use could be better than, for example, fossil fuels, and advances in renewable energy storage could help.)

“[A]chieving a high density of electrical power generation is challenging,” the team explains in its paper. “Traditional hydraulic power generation mainly uses electromagnetic generators that are heavy, bulky, and become inefficient with low water supply.” Diversifying how power is generated by water sources such as oceans and rivers is good for the existing infrastructure as well as new installations.

The research team found that as simulated raindrops fell on their device, the way the water accumulated and spread created a link between their two electrodes, one Teflon-coated and the other aluminum. This watery de facto wire link closes the loop and allows accumulated energy to move through the system. Because it’s a mechanical setup, it’s not limited to salty seawater, and because the medium is already water, its potential isn’t affected by ambient humidity either.

Raindrop energy is very low frequency, which means this tech joins many other existing pushes to harvest continuously available, low frequency natural energy, including underwater 'kites' that exploit steady currents. To make an interface that increases “instantaneous power density by several orders of magnitude over equivalent devices,” as the researchers say they’ve done here, could represent a major step toward feasibility in triboelectric generation.

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London Electricity Tunnel strengthens grid modernization with high-voltage cabling from major substations, increasing redundancy, efficiency, and resilience while enabling renewable integration, optimized power distribution, and a stable, low-loss electricity supply across the capital.

Key Points

A high-voltage tunnel upgrading London's grid, with capacity, redundancy, and renewable integration for reliable power.

✅ High-voltage cabling from key substations boosts capacity

✅ Redundancy improves reliability during grid faults

✅ Enables renewable integration and lower transmission losses

London’s energy infrastructure has recently taken a significant leap forward with the commissioning of its newest electricity tunnel, and related upgrades like the 2GW substation that bolster transmission capacity, a project that promises to enhance the reliability and efficiency of the city's power distribution. This cutting-edge tunnel is a key component in London’s ongoing efforts to modernize its energy infrastructure, support its growing energy demands, and contribute to its long-term sustainability goals.

The newly activated tunnel is part of a broader initiative to upgrade London's aging power grid, which has faced increasing pressure from the city’s expanding population and its evolving energy needs, paralleling Toronto's electricity planning to accommodate growth. The tunnel is designed to carry high-voltage electricity from major substations to various parts of the city, improving the distribution network's capacity and reliability.

The construction of the tunnel was a major engineering feat, involving the excavation of a vast underground passage that stretches several kilometers beneath the city. The tunnel is equipped with advanced technology and materials to ensure its resilience and efficiency, and is informed by advances such as HVDC technology being explored across Europe for stronger grids. It features state-of-the-art cabling and insulation to handle high-voltage electricity safely and efficiently, minimizing energy losses and improving overall grid performance.

One of the key benefits of the new tunnel is its ability to enhance the reliability of London’s power supply. As the city continues to grow and demand for electricity increases, maintaining a stable and uninterrupted power supply is critical. The tunnel helps address this need by providing additional capacity and creating redundancy in the power distribution network, aligning with national efforts to fast-track grid connections that unlock capacity across the UK.

The tunnel also supports London’s sustainability goals by facilitating the integration of renewable energy sources into the grid. With the increasing use of solar, wind, and other clean energy technologies, including the Scotland-to-England subsea link that will carry renewable power, the power grid needs to be able to accommodate and distribute this energy effectively. The new tunnel is designed to handle the variable nature of renewable energy, allowing for a more flexible and adaptive grid that can better manage fluctuations in supply and demand.

In addition to its technical benefits, the tunnel represents a significant investment in London’s future energy infrastructure, echoing calls to invest in smarter electricity infrastructure across North America and beyond. The project has created jobs and stimulated economic activity during its construction phase, and it will continue to provide long-term benefits by supporting a more efficient and resilient power system. The upgrade is part of a broader strategy to modernize the city’s infrastructure and prepare it for future energy challenges.

The completion of the tunnel also reflects a commitment to addressing the challenges of urban infrastructure development. Building such a major piece of infrastructure in a densely populated city like London requires careful planning and coordination to minimize disruption and ensure safety. The project team worked closely with local communities and businesses to manage the construction process and mitigate any potential impacts.

As London moves forward, the new electricity tunnel will play a crucial role in supporting the city’s energy needs. It will help ensure that power is delivered efficiently and reliably to homes, businesses, and essential services. The tunnel also sets a precedent for future infrastructure projects, demonstrating how advanced engineering and technology can address the demands of modern urban environments.

The successful activation of the tunnel marks a significant milestone in London’s efforts to build a more sustainable and resilient energy system. It represents a forward-thinking approach to managing the city’s energy infrastructure and addressing the challenges posed by population growth, increasing energy demands, and the need for cleaner energy sources.

Looking ahead, London will continue to invest in and upgrade its energy infrastructure to support its ambitious climate goals and ensure a reliable power supply for its residents, a trend mirrored by Toronto's preparations for surging demand as that city continues to grow. The new electricity tunnel is just one example of the city’s commitment to innovation and sustainability in its approach to energy management.

In summary, London’s newest electricity tunnel is a major advancement in the city’s power distribution network. By enhancing reliability, supporting the integration of renewable energy, and investing in long-term infrastructure, the tunnel plays a critical role in addressing the city’s energy needs and sustainability goals. As London continues to evolve, such infrastructure projects will be essential in meeting the demands of a growing metropolis and creating a more resilient and efficient energy system for the future.

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Shift from Fossil Fuels to Renewables signals an energy transition and decarbonization, as investors favor wind and solar over coal, oil, and gas due to falling ROI, policy shifts, and accelerating clean-tech innovation.

Key Points

An economic and policy-driven move redirecting capital from coal, oil, and gas to scalable wind and solar power.

✅ Driven by ROI, risk, and protests curbing fossil fuel projects

✅ Coal declines as wind and solar capacity surges globally

✅ Policy, technology, and markets speed the energy transition

This article is an excerpt from "Changing Tides: An Ecologist's Journey to Make Peace with the Anthropocene" by Alejandro Frid. Reproduced with permission from New Society Publishers. The book releases Oct. 15.

The climate and biodiversity crises reflect the stories that we have allowed to infiltrate the collective psyche of industrial civilization. It is high time to let go of these stories. Unclutter ourselves. Regain clarity. Make room for other stories that can help us reshape our ways of being in the world.

For starters, I’d love to let go of what has been our most venerated and ingrained story since the mid-1700s: that burning more fossil fuels is synonymous with prosperity. Letting go of that story shouldn’t be too hard these days. Financial investment over the past decade has been shifting very quickly away from fossil fuels and towards renewable energies, as Europe's oil majors increasingly pivot to electrification. Even Bob Dudley, group chief executive of BP — one of the largest fossil fuel corporations in the world — acknowledged the trend, writing in the "BP Statistical Review of World Energy 2017": "The relentless drive to improve energy efficiency is causing global energy consumption overall to decelerate. And, of course, the energy mix is shifting towards cleaner, lower carbon fuels, driven by environmental needs and technological advances." Dudley went on:

Coal consumption fell sharply for the second consecutive year, with its share within primary energy falling to its lowest level since 2004. Indeed, coal production and consumption in the U.K. completed an entire cycle, falling back to levels last seen almost 200 years ago around the time of the Industrial Revolution, with the U.K. power sector recording its first-ever coal-free day in April of this year. In contrast, renewable energy globally led by wind and solar power grew strongly, helped by continuing technological advances.

According to Dudley’s team, global production of oil and natural gas also slowed down in 2016. Meanwhile, that same year, the combined power provided by wind and solar energy increased by 14.6 percent: the biggest jump on record. All in all, since 2005, the installed capacity for renewable energy has grown exponentially, doubling every 5.5 years, as investment incentives expand to accelerate clean power.

The shift away from fossil fuels and towards renewables has been happening not because investors suddenly became science-literate, ethical beings, but because most investors follow the money, and Trump-era oil policies even reshaped Wall Street’s energy strategies.

It is important to celebrate that King Coal — that grand initiator of the Industrial Revolution and nastiest of fossil fuels — has just begun to lose its power over people and the atmosphere. But it is even more important to understand the underlying causes for these changes. The shift away from fossil fuels and towards renewables has been happening not because the bulk of investors suddenly became science-literate, ethical beings, but because most investors follow the money.

The easy fossil fuels — the kind you used to be able to extract with a large profit margin and relatively low risk of disaster — are essentially gone. Almost all that is left are the dregs: unconventional fossil fuels such as bitumen, or untapped offshore oil reserves in very deep water or otherwise challenging environments, like the Arctic. Sure, the dregs are massive enough to keep tempting investors. There is so much unconventional oil and shale gas left underground that, if we burned it, we would warm the world by 6 degrees or more. But unconventional fossil fuels are very expensive and energy-intensive to extract, refine and market. Additionally, new fossil fuel projects, at least in my part of the world, have become hair triggers for social unrest. For instance, Burnaby Mountain, near my home in British Columbia, where renewable electricity in B.C. is expanding, is the site of a proposed bitumen pipeline expansion where hundreds of people have been arrested since 2015 during multiple acts of civil disobedience against new fossil fuel infrastructure. By triggering legal action and delaying the project, these protests have dented corporate profits. So return on investment for fossil fuels has been dropping.

It is no coincidence that in 2017, Petronas, a huge transnational energy corporation, withdrew their massive proposal to build liquefied natural gas infrastructure on the north coast of British Columbia, as Canada's race to net-zero gathers pace across industry. Petronas backed out not because of climate change or to protect essential rearing habitat for salmon, but to backpedal from a deal that would fail to make them richer.

Shifting investment away from fossil fuels and towards renewable energy, even as fossil-fuel workers signal readiness to support the transition, does not mean we have entirely ditched that tired old story about fossil fuel prosperity.

Neoliberal shifts to favor renewable energies can be completely devoid of concern for climate change. While in office, former Texas Gov. Rick Perry questioned climate science and cheered for the oil industry, yet that did not stop him from directing his state towards an expansion of wind and solar energy, even as President Obama argued that decarbonization is irreversible and anchored in long-term economics. Perry saw money to be made by batting for both teams, and merely did what most neoliberal entrepreneurs would have done.

The right change for the wrong reasons brings no guarantees. Shifting investment away from fossil fuels and towards renewable energy does not mean we have entirely ditched that tired old story about fossil fuel prosperity. Once again, let’s look at Perry. As U.S. secretary of energy under Trump’s presidency, in 2017 he called the global shift from fossil fuels "immoral" and said the United States was "blessed" to provide fossil fuels for the world.

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Ontario Hydro Flat Rate sets a single electricity rate at 12.8 cents per kWh, replacing time-of-use pricing for Ontario ratepayers, affecting hydro bills this summer, alongside COVID-19 Energy Assistance Program support.

Key Points

A fixed 12.8 cents per kWh electricity price replacing time-of-use rates across Ontario from June to November.

✅ Single rate applies 24/7, replacing time-of-use pricing

✅ May slightly raise bills versus pre-pandemic usage patterns

✅ COVID-19 aid offers one-time credits for households, small firms

A new provincial COVID-19 measure, including a fixed COVID-19 hydro rate designed to give Ontario ratepayers "stability" on their hydro bills this summer, could result in slightly higher hydro costs over the next four months.

Ontario Premier Doug Ford's government announced over the weekend that consumers would be charged a single around-the-clock electricity rate between June and November, before a Nov. 1 rate increase takes effect, replacing the much-derided time-of-use model ratepayers have complained about for years.

Instead of being charged between 10 to 20 cents per kilowatt hour, depending on the time of day electricity is used, including ultra-low TOU rates during off-peak hours, hydro users will be charged a blanket rate of 12.8 cents per kWh.

"The new rate will simply show up on your bill," Premier Doug Ford said at a Monday afternoon news conference.

While the government said the new fixed rate would give customers "greater flexibility" to use their home appliances without having to wait for the cheapest rate -- and has tabled legislation to lower rates as part of its broader plan -- the new policy also effectively erases a pandemic-related hydro discount for millions of consumers.

For example, a pre-pandemic bill of $59.90 with time-of-use rates, will now cost $60.28 with the government's new recovery rate, as fixed pricing ends across the province, before delivery charges, rebates and taxes.

That same bill would have been much cheaper -- $47.57 -- if the government continued applying the lowest tier of time-of-use 24/7 under an off-peak price freeze as it had been doing since March 24.

The government also introduced support for electric bills with two new assistance programs to help customers struggling to pay their bills.

The COVID-19 Energy Assistance Program will provide a one-time payment consumers to help pay off electricity debt incurred during the pandemic -- which will cost the government $9 million.

The government will spend another $8 million to provide similar assistance to small businesses hit hard by the pandemic.

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CPUC Decision on San Diego Community Power directs SDG&E to use updated forecasts, stabilizing electricity rates for CCA customers and supporting clean energy in San Diego with accurate rate forecasting and reduced volatility.

Key Points

A CPUC ruling directing SDG&E to use updated forecasts to ensure accurate, stable CCA rates and limit volatility.

✅ Uses 2021 sales forecasts for rate setting

✅ Aims to prevent undercollection and bill spikes

✅ Levels changes across customer classes

The California Public Utilities Commission on Thursday sided with the soon-to-launch San Diego community energy program in a dispute it had with San Diego Gas & Electric.

San Diego Community Power — which will begin to purchase power for customers in San Diego, Chula Vista, La Mesa, Encinitas and Imperial Beach later this year — had complained to the commission that data SDG&E intended to use to calculate rates, including community choice exit fees that could make the new energy program less attractive to prospective customers.

SDG&E argued it was using numbers it was authorized to employ as part of a general rate case amid a potential rate structure revamp that is still being considered by the commission.

But in a 4-0 vote, the commission, or CPUC, sided with San Diego Community Power and directed SDG&E to use an updated forecast for energy sales.

"This was not an easy decision," said CPUC president Marybel Batjer at the meeting, held remotely due to COVID-19 restrictions. "In my mind, this outcome best accounts for the shifting realities ... in the San Diego area while minimizing the impact on ratepayers during these difficult financial times."

In filings to the commission, SDG&E predicted a rate decrease of 12.35 percent in the coming year. While that appears to be good news for customers, Californians still face soaring electricity prices statewide, Commissioner Martha Guzman Aceves said the data set SDG&E wanted to use would lead to an undercollection of $150 million to $260 million.

That would result in rates that would be "artificially low," Guzman Aceves said, and rates "would inevitably go up quite a bit after the undercollection was addressed."

San Diego Community Power, or SDCP, said the temporary reduction would make its rates less attractive than SDG&E's, especially amid SDG&E's minimum charge proposal affecting low-usage customers, just as it is about to begin serving customers. SDCP's board members wrote an open letter last month to the commission, accusing the utility of "willful manipulation of data."

Working with an administrative law judge at the CPUC, Guzman Aceves authored a proposal requiring SDG&E to use numbers based on 2021 forecasts, as regulators simultaneously weigh whether the state needs more power plants to ensure reliability. The utility argued that could result in an increase of "roughly 40 percent" for medium and large commercial and industrial customers this year.

To help reduce potential volatility, Guzman Aceves, SDCP and other community energy supporters called for using a formula that would average out changes in rates across customer classes amid debates over income-based utility charges statewide. That's what the commissioners OK'd Thursday.

"It is essential that customer commodity rates be as accurate as we can possibly get them to avoid undercollections," said Commissioner Genevieve Shiroma.

San Diego Community Power is one of 23 community choice aggregation, or CCA, energy programs that have launched in California in the past decade.

CCAs compete with traditional power companies amid California's evolving power competition landscape, in one important role — purchasing power for a given community. They were created to boost the use of cleaner energy sources, such as wind and solar, at rates equal to or lower than investor-owned utilities.

However, CCAs do not replace utilities because the incumbent power companies still perform all of the tasks outside of power purchasing, such as transmission and distribution of energy and customer billing.

When a CCA is formed, California rules stipulate the utility customers in that area are automatically enrolled in the CCA. If customers prefer to stay with their previous power company, they can opt out of joining the CCA.

The shift of customers from SDG&E to San Diego Community Power is expected to be large. The total number of accounts for SDCP is expected to be 770,000, which would make it the second-largest CCA in the state. That's why SDCP considered Thursday's CPUC decision to be so important.

"At a time when customers are choosing between sticking with San Diego Gas & Electric and migrating to a CCA, we want them to have accurate bill information," said Commissioner Clifford Rechtschaffen.

"SDCP is very happy with today's CPUC decision, and that the commissioners shared our goal of limiting rate volatility for businesses and families in the region," said SDCP interim CEO Bill Carnahan. "This is definitely a win for accurate rate forecasting, and our mutual customers, and we look forward to working with SDG&E on next steps."

In an email, SDG&E spokeswoman Helen Gao said, "We are committed to continuing to work collaboratively with local Community Choice Aggregation programs to support their successful launch in 2021 and ensure that our mutual customers receive excellent customer service."

San Diego Community Power's case before the CPUC was joined by the California Community Choice Association, a trade group advocating for CCAs, and the Clean Energy Alliance — the North County-based CCA representing Del Mar, Solana Beach and Carlsbad that is scheduled to launch this summer.

SDCP will begin its rollout this year, folding in about 71,000 municipal, commercial and industrial accounts. The bulk of its roughly 700,000 residential accounts is expected to come in January 2022.

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UK Nuclear Power Expansion is vital for low-carbon baseload, energy security, and Net Zero, complementing renewables like wind and solar, reducing gas reliance, and unlocking investment through clear financing rules and proven, dependable reactor technology.

Key Points

Accelerating reactor build-out for low-carbon baseload to boost energy security and help deliver the UK Net Zero target.

✅ Cuts gas dependence and stabilizes grids with firm capacity.

✅ Complements wind and solar for reliable, low-carbon supply.

✅ Needs clear financing to unlock investment and lower costs.

Leading nuclear industry figures will today call for a major programme of new power stations to hit ambitious emissions reduction targets.

The 19th Nuclear Industry Association annual conference in London will highlight the need for a proven, dependable source of low carbon electricity generation alongside growth in weather-dependent solar and wind power, and particularly the rapid expansion of wind and solar generation across the UK.

Without this, they argue, the country risks embedding a major reliance on carbon-emitting gas fired power stations as Europe loses nuclear capacity at a critical time for energy security for generations to come.

Annual public opinion polling released today to coincide with the conference revealed 75% of the population want the UK Government to take more action to reduce CO2 emissions.

The survey, conducted by YouGov in October 2019, has tracked opinion trends on nuclear for more than a decade. It shows continued and consistent public support for an energy mix including nuclear and renewables, with 72% of respondents agreeing this was needed to ensure a reliable supply of electricity.

Nuclear power was also perceived as the most secure energy source for keeping the lights on, compared to other sources such as oil, gas, coal, wind power, fracking and solar power.

Last month both the Labour and Conservative Parties committed to new nuclear power as part of their election Manifestos and the government's wider green industrial revolution plans for clean growth. At the same time, 27 leading figures in the fields of environment, energy, and industry signed an open letter addressed to parliamentary candidates, which set out the benefits of nuclear and underscored the consequences of not, at least, replacing the UK's current fleet of power stations.

The Nuclear Industry Association said there is no time to be lost in clarifying the ambition and the financing rules for new nuclear power which would bring down costs and unlock a major programme of investment.

Tom Greatrex, Chief Executive of the NIA, said "We have to grow the industry's contribution to a low carbon economy. The independent Committee on Climate Change said earlier this year that we need a variety of technologies including nuclear power/1 for net zero to reach the UK's Net Zero emissions target by 2050".

"This is a proven, dependable, technology with lower lifecycle CO2 emissions than solar power and the same as offshore wind/2. It is also an important economic engine for the UK, supporting uses beyond electricity and creating high quality direct and indirect employment for around 155,000 people."

"Right now nuclear provides 20%/3 of all the UK's electricity but all but one of our existing fleet will close over the next decade, amid the debate over nuclear's decline as power demand will only increase with a shift to electric heating and vehicles."

"The countries and regions which have most successfully decarbonised, like Sweden, France and Ontario in Canada, have done so by relying on nuclear, aligning with Canada's climate goals for affordable, safe power today. You are not serious about tackling climate change if you are not serious about nuclear".

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