San Diego Navy Office goes to Sweden for wind power

Polycrystalline Tin Selenide Thermoelectrics enable waste heat recovery with ZT 3.1, matching single crystals while cutting costs, powering greener car engines, industrial furnaces, and thermoelectric generators via p-type and emerging n-type designs.

Key Points

Low-cost tin selenide devices that turn waste heat into power, achieving ZT 3.1 and enabling p-type and n-type modules.

✅ Oxygen removal prevents heat-leaking tin oxide grain skins.

✅ Polycrystalline ingots match single-crystal ZT 3.1 at lower cost.

✅ N-type tin selenide in development to pair with p-type.

So-called thermoelectric generators turn waste heat into electricity without producing greenhouse gas emissions, providing what seems like a free lunch. But despite helping power the Mars rovers, the high cost of these devices has prevented their widespread use. Now, researchers have found a way to make cheap thermoelectrics that work just as well as the pricey kind. The work could pave the way for a new generation of greener car engines, industrial furnaces, and other energy-generating devices.

“This looks like a very smart way to realize high performance,” says Li-Dong Zhao, a materials scientist at Beihang University who was not involved with the work. He notes there are still a few more steps to take before these materials can become high-performing thermoelectric generators. However, he says, “I think this will be used in the not too far future.”

Thermoelectrics are semiconductor devices placed on a hot surface, like a gas-powered car engine or on heat-generating electronics using thin-film converters to capture waste heat. That gives them a hot side and a cool side, away from the hot surface. They work by using the heat to push electrical charges from one to the other, a process of turning thermal energy into electricity that depends on the temperature gradient. If a device allows the hot side to warm up the cool side, the electricity stops flowing. A device’s success at preventing this, as well as its ability to conduct electrons, feeds into a score known as the figure of merit, or ZT.

 Over the past 2 decades, researchers have produced thermoelectric materials with increasing ZTs, while related advances such as nighttime solar cells have broadened thermal-to-electric concepts. The record came in 2014 when Mercouri Kanatzidis, a materials scientist at Northwestern University, and his colleagues came up with a single crystal of tin selenide with a ZT of 3.1. Yet the material was difficult to make and too fragile to work with. “For practical applications, it’s a non-starter,” Kanatzidis says.

So, his team decided to make its thermoelectrics from readily available tin and selenium powders, an approach that, once processed, makes grains of polycrystalline tin selenide instead of the single crystals. The polycrystalline grains are cheap and can be heated and compressed into ingots that are 3 to 5 centimeters long, which can be made into devices. The polycrystalline ingots are also more robust, and Kanatzidis expected the boundaries between the individual grains to slow the passage of heat. But when his team tested the polycrystalline materials, the thermal conductivity shot up, dropping their ZT scores as low as 1.2.

In 2016, the Northwestern team discovered the source of the problem: an ultrathin skin of tin oxide was forming around individual grains of polycrystalline tin selenide before they were pressed into ingots. And that skin acted as an express lane for the heat to travel from grain to grain through the material. So, in their current study, Kanatzidis and his colleagues came up with a way to use heat to drive any oxygen away from the powdery precursors, leaving pristine polycrystalline tin selenide, whereas other devices can generate electricity from thin air using ambient moisture.

The result, which they report today in Nature Materials, was not only a thermal conductivity below that of single-crystal tin selenide but also a ZT of 3.1, a development that echoes nighttime renewable devices showing electricity from cold conditions. “This opens the door for new devices to be built from polycrystalline tin selenide pellets and their applications to be explored,” Kanatzidis says.

Getting through that door will still take some time. The polycrystalline tin selenide the team makes is spiked with sodium atoms, creating what is known as a “p-type” material that conducts positive charges. To make working devices, researchers also need an “n-type” version to conduct negative charges.

Zhao’s team recently reported making an n-type single-crystal tin selenide by spiking it with bromine atoms. And Kanatzidis says his team is now working on making an n-type polycrystalline version. Once n-type and p-type tin selenide devices are paired, researchers should have a clear path to making a new generation of ultra-efficient thermoelectric generators. Those could be installed everywhere from automobile exhaust pipes to water heaters and industrial furnaces to scavenge energy from some of the 65% of fossil fuel energy that winds up as waste heat. 

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COVID-19 Impact on US Electric Grid: utilities, ERCOT, PJM, and MISO brace for load shifts as remote work rises, industrial demand falls, and nuclear plants enforce pandemic planning to maintain reliability and resilience.

Key Points

Pandemic-driven changes in electricity demand and operations as utilities shift to remote work and reduced industrial use.

✅ Utilities enact remote work and suspend disconnections

✅ Grid operators model load shifts and maintain reliability

✅ Nuclear plants sustain operations with pandemic protocols

Operators of the nation's electric grid and energy companies are bracing for the spread of a virus that is undercutting power demand in countries across Asia and Europe as daily activities grind to a halt.

Owners of U.S. utilities and nuclear plants are canceling events, halting travel, pushing remote work and testing ill workers to slow the spread of the novel coronavirus.

So far, grid operators in the United States say no substantial effect on the electricity demand has emerged, but that could change, even though some reports indicate the U.S. grid is safe for now amid COVID-19. Texas' main grid operator, the Electric Reliability Council of Texas (ERCOT), expressed uncertainty when asked whether it will see changes in demand patterns for power due to the virus.

"It's too early to tell," Leslie Sopko, a spokeswoman for ERCOT, said in an email.

The virus has already taken a toll on power demand overseas. The chairman of Japan's federation of electric utilities and president of Chubu Electric Power Co., Satoru Katsuno, told reporters Friday the country's power demand has weakened as industrial activity slows due to the outbreak, according to Reuters.

The news outlet similarly reported China's industrial power demand this year may decline as the virus curtailed factory output and prevented some employees from returning to work. And, according to Bloomberg, power use in Italy slumped 7.4% last week after the government there shut down schools and told workers to remain home, while Ontario electricity demand also declined as people stayed home.

U.S. utility executives said the sector is well prepared and has faced the threat of spreading infections before. More than a decade ago, global virus scares like SARS pushed companies to hammer out extensive disaster planning, and those have stuck.

"A lot of the foundational work on contingency planning is actually rooted in pandemic planning because of those experiences in the mid-2000s," Scott Aaronson, the Edison Electric Institute's vice president of security and preparedness, told E&E News. "There is a good body of work and a lot of planning and exercises that have gone into being able to operate through these challenges."

Keeping the nation's electric grid running is a top priority at the Department of Energy, said Chris Fall, the agency's point person for COVID-19, which the new coronavirus causes. "Our responsibility is to make sure the electrical grid is resilient and working," said Fall, who directs the department's Office of Science.

He told an agency podcast, called "Direct Current," that the department is working with the private sector and other elements of the energy system. "Obviously we are connected with other agencies like Homeland Security or [the Federal Energy Regulatory Commission] on things like the electrical grid and making sure we have power, and if those people get sick or impacted, we have backups for all of that," he said.

According to a bulletin EEI released on the issue, 40% of a company's employees could be out sick, be quarantined or stay home to care for sick family members. And pandemics may prevent "traditional mutual assistance programs that help companies restore service after natural disasters and weather events," EEI said, such as restoring power in Florida after major storms.

The utility sector is also juggling the needs of its customers. Many major utilities across the nation have vowed to suspend shut-offs and keep power, heat and water on for all customers — a particular concern for people who may be out of work and cannot afford to pay their bills. Companies are also suspending disconnections for nonpayment, some under direction from officials and regulators in states like Ohio and Connecticut, while in Canada Hydro One's peak rate policy has drawn attention among self-isolating customers.

Like other businesses preparing for pandemics, utilities focus on keeping the workforce healthy and operations running. But EEI's Aaronson noted that a key difference with keeping critical infrastructure humming is the possible requirement for the sheltering in place of essential employees who are unable to do their jobs from home, as some operators contemplate locking down key staff at work sites to ensure continuity.

Grid operators are also well-equipped to handle shifts in power demand, and he acknowledged the sector could see changes as more offices and businesses move to remote working. He compared it to the load demand shifts between weekdays and weekends.

"So on the weekends, you're going to have a lot of people at home," Aaronson said. "During the week, it's people in offices. But generally speaking, the ability to have that resiliency and redundancy, the ability to shift resources and the way the grid balances, that is not going to change."

Electricity demand from high-intensity industries like manufacturing or theme parks like Disneyland could also wane, he added, even as electricity inequality in California influences who is most affected.

"It's not just a load shift to the residential, but it's also the load drop in some cases," Aaronson said. "Some of the commercial and industrial customers are going to be working a little bit less than they are presently."

Nuclear plants
Work is continuing at the Plant Vogtle nuclear construction project after Georgia Power Co. announced that one of the site workers is being tested for the coronavirus. The utility does not have the results of that test, a Georgia Power spokesman said late yesterday afternoon. The person works primarily in an office setting and is not on the construction site where two nuclear reactors are being built.

A second worker was tested Saturday, and those results were negative, spokesman John Kraft told E&E News.

Vogtle boasts a high worker count of 9,000 across the entire construction site, which includes office buildings. This is mostly craft laborers, but there are also administrators, executives and Nuclear Regulatory Commission safety inspectors.

A number of contractors and vendors are also on site given the complexity of the project.

Employees who were near the office worker being tested have been sent home until the company receives results. If the test is positive, then those workers will stay home for 14 days, Georgia Power said.

"The company is taking every action to prepare for impacts of the COVID-19 pandemic," Kraft said in a statement. This includes using advice from medical professionals and the Atlanta-based Centers for Disease Control and Prevention.

Georgia Power, owned by Atlanta-based Southern Co., informed regulators at the NRC that a worker was being tested. The federal commission itself has pandemic plans in place to ensure continued oversight, including robust work-from-home capabilities and "social distancing" practices to limit close contact among employees at headquarters.

NRC spokesman Scott Burnell said in an email that telework is not unusual for the agency, and about 75% of its workforce is already equipped to work remotely. The commission tested its telework readiness Friday. Some positions require workers to stay on-site to ensure safe reactor operations, Burnell added.

The nuclear industry has maintained pandemic preparedness plans and procedures since 2006, which have been shared with federal agencies, according to Mary Love, a spokeswoman for the Nuclear Energy Institute. "NEI members are participating in weekly calls to facilitate communications, coordination and best practices," she said.

According to NEI statistics, each plant averages 500 to 1,000 workers. While not every position is essential to operations, some areas like the control room cannot be conducted remotely.

"We know that nuclear power plant operations and the availability of electric service will be tremendously important in minimizing the impact of the situation on the general public," Love added. "We are confident, based on extensive planning, that the industry will continue to operate nuclear plants safely as this event unfolds."

Grid operators
Hundreds of workers responsible for overseeing critical operations of the U.S. electric grid are being encouraged to work from home, their offices are being sanitized, and in-person meetings are being moved online.

PJM Interconnection, the nation's largest grid operator covering some 65 million people across Mid-Atlantic and Midwest states, said Friday a forecast on load changes was not yet available.

PJM has moved all stakeholder meetings online. Employee travel has been suspended, as have external visits to its headquarters in Valley Forge, Pa.

Employees "are equipped to work remotely, if necessary, to maintain business continuity," and PJM "is prepared and able to run and support all market applications from its campus or remotely, as needed," the operator said.

"PJM recognizes that these measures have significant impacts to our staff, members and stakeholders," PJM said on its coronavirus response webpage. "We are dedicated to striking a balance between those impacts and our number one priority — the reliability of the grid."

Still pending at the operator is a decision about its annual meeting in Chicago at the beginning of May. That decision will be made by April 3, PJM said.

The Midcontinent Independent System Operator (MISO), which runs the bulk power grid across 15 states and the Canadian province of Manitoba, is also holding meetings via conference call or online and restricting all business travel.

MISO has encouraged "nonessential" employees to work remotely, leaving only those who actively monitor and manage the operation of the grid working on-site.

The grid operator employs nearly 1,000 people, including 780 at its headquarters in Carmel, Ind.

A board meeting set for the last week of March in New Orleans hasn't yet been canceled, with a final decision on whether to move forward with the meeting expected today.

MISO said it hasn't encountered other changes in normal operations and has not seen significant shifts in electricity demand.

In Texas, ERCOT has about 750 employees, mostly at its campus in the city of Taylor. ERCOT's Sopko said the grid operator is encouraging employees who are not required to be on-site to work from home. The policy is voluntary at this time, but that could change quickly, she said Friday.

ERCOT is also taking extra steps to keep workers safe, including alternating use of facilities, encouraging social distancing and imposing control room measures as part of its pandemic planning, she added.

Energy companies
In the Midwest, utilities including DTE Energy Co., Commonwealth Edison, Consumers Energy and Ameren Corp. said they're following CDC guidance and working with state and local officials to help slow the spread of the virus. That means asking employees who can do their jobs at home to do so, restricting visitors to company offices, canceling large assemblies and nonessential business travel, and holding meetings by phone or online.

Chicago-based ComEd, which serves 4 million customers, is imposing a moratorium on service disconnections and waiving new late payment charges through at least May 1, in addition to working with customers who are facing financial hardships on a case-by-case basis to establish payment arrangements and identify energy assistance options, spokesman Paul Elsberg said.

Many of the Southeast's major energy companies are also curbing travel and encouraging telework, among other steps, in response to the coronavirus.

For Southern Co., this includes its Georgia Power unit; Southern Power; and employees of Southern Company Gas, who are in Illinois, Tennessee and Virginia. Southern has not extended the policies to its Alabama and Mississippi electric companies, spokesman Schuyler Baehman said.

Charlotte, N.C.-based Duke Energy Corp. has suspended all business travel unless workers are traveling by car. The energy giant also is encouraging its employees to rethink their own vacations if upcoming trips take them out of the country.

"Circumstances are changing rapidly around the world," the company said in a statement.

For workers who must come to the office, or work at power plants or on the lines, utilities are doubling down on disinfectant in those areas.

"We're also reminding our employees that we provide a very critical service; we need you well, we need you able," said Le-Ha Anderson, a spokeswoman for Richmond, Va.-based Dominion Energy Inc.

Dominion started asking employees a few weeks ago to take mobile devices home and make sure they have what they need to work remotely. Anyone who has traveled to one of the CDC-identified hot spots is asked to stay home for 14 days with no questions asked, Anderson said.

The federally owned Tennessee Valley Authority has reviewed and updated its plans on how it will operate during a pandemic but has not yet reached the point to have employees telework if they are able to do so.

"We come at this at a very phased approach," TVA spokesman Jim Hopson said. "We can't just shut the doors."

State utility commissions, too, have begun taking steps. In response to a state of emergency declared by Ohio Gov. Mike DeWine (R), the Public Utilities Commission of Ohio on Thursday directed utilities to act where possible to avoid suspending service to customers.

Will Seuffert, executive secretary of the Minnesota Public Utilities Commission, said in an email that the regulator has canceled all public hearings and agenda meetings for the next two weeks and has been supporting telework "throughout the agency" in response to the virus.

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Ukraine Winter Energy Crisis highlights blackouts, damaged grid, and resilient solutions: solar panels, generators, wood stoves, district heating, batteries, and energy efficiency campaigns backed by EU and US aid to support communities through harsh winters.

Key Points

A wartime surge of blackouts driving resilient, off-grid and efficiency solutions to keep heat and power flowing.

✅ Solar panels, batteries, and generators stabilize essential loads

✅ Wood stoves and district heating maintain winter warmth

✅ Efficiency upgrades and aid bolster grid resilience

As winter sets in across Ukraine, the country faces not only the bitter cold but also the ongoing energy crisis exacerbated by Russia’s invasion. Over the past year, Ukraine has experienced widespread blackouts due to targeted strikes on its power infrastructure. With the harsh winter conditions ahead, Ukrainians are finding innovative ways to adapt to these energy challenges and to keep the lights on this winter despite shortages. From relying on alternative power sources to implementing energy-saving measures, the Ukrainian population is demonstrating resilience in the face of adversity.

The Energy Crisis in Ukraine

Since the onset of the war in February 2022, Ukraine’s energy infrastructure has become a prime target for Russian missile strikes. Power plants, electrical grids, and transmission lines have all been hit, causing significant damage to the nation’s energy systems, as Ukraine fights to keep the lights on amid repeated attacks. As a result, millions of Ukrainians have faced regular power outages, especially in the winter months when energy demand surges due to heating needs.

The situation has been compounded by the difficulty of repairing damaged infrastructure while the war continues. Many areas, particularly in eastern and southern Ukraine, still suffer from limited access to electricity, heating, and water, with strikes in western Ukraine occasionally causing further disruptions. With no end in sight to the conflict, the Ukrainian government and its citizens are being forced to think outside the box to ensure they can survive the harsh winter months.

Alternative Energy Sources: Solar Power and Generators

In response to these energy shortages, many Ukrainians are turning to alternative energy sources, particularly solar power and generators. Solar energy, which has been growing in popularity over the past decade, is seen as a promising solution. Solar panels can be installed on homes, schools, and businesses, providing a renewable source of electricity. During the day, the sun provides much-needed energy to power lights, appliances, and even heating systems in homes. While solar power may not fully replace the energy lost during blackouts, it can significantly reduce dependency on the grid, and recent electricity reserve updates suggest fewer planned outages if attacks abate.

To make solar power more accessible, many local and international organizations are providing solar panels and batteries to Ukrainians. These efforts have been critical, especially in rural areas where access to the national grid may be sporadic or unreliable. Additionally, solar-powered streetlights and community energy hubs are being set up in various cities to provide essential services during prolonged outages.

Generators, too, have become a vital tool for many households. Portable generators allow people to maintain some level of comfort during blackouts, powering essential appliances like refrigerators, stoves, and even small heaters. While generators are not a permanent solution, they offer a crucial lifeline when the grid is down for extended periods.

Wood and Coal Stoves: A Return to the Past

In addition to modern energy solutions, many Ukrainians are returning to more traditional sources of energy, such as wood and coal stoves. These methods of heating, while old-fashioned, are still widely available and effective. With gas shortages affecting the country and electricity supplies often unreliable, wood and coal stoves have become an essential part of daily life for many households.

Firewood is being sourced locally, and many Ukrainians are collecting and stockpiling it in preparation for the colder months. While this reliance on solid fuels presents environmental concerns, it remains one of the most feasible options for families living in rural areas or in homes without access to reliable electricity.

Moreover, some urban areas have seen a revival of district heating systems, where heat is generated centrally and distributed throughout a network of buildings. This system, although not without its challenges, is helping to provide warmth to thousands of people in larger cities like Kyiv and Lviv.

Energy Conservation and Efficiency

Beyond alternative energy sources, many Ukrainians are taking measures to reduce their energy consumption. Energy conservation has become a key strategy in dealing with blackouts, as individuals and families aim to minimize their reliance on the national grid. Simple steps like using energy-efficient appliances, sealing windows and doors to prevent heat loss, and limiting the use of electric heating have all become commonplace.

The Ukrainian government, in collaboration with international partners, has also launched campaigns to encourage energy-saving behaviors. These include public information campaigns on how to reduce energy consumption and initiatives to improve the insulation of homes and buildings. By promoting energy efficiency, Ukraine is not only making the most of its limited resources but also preparing for long-term sustainability.

The Role of the International Community

The international community has played a crucial role in helping Ukraine navigate the energy crisis. Several countries and organizations have provided funding, technology, and expertise to assist Ukraine in repairing its power infrastructure and implementing alternative energy solutions. For example, the United States and the European Union have supplied Ukraine with generators, solar panels, and other renewable energy technologies, though U.S. support for grid restoration has recently ended in some areas of assistance. This support has been vital in ensuring that Ukrainians can meet their energy needs despite the ongoing conflict.

In addition, humanitarian organizations have been working to provide emergency relief, including distributing winter clothing, heaters, and fuel to the most vulnerable populations, and Ukraine helped Spain amid blackouts earlier this year, underscoring reciprocal resilience. The global response has been a testament to the solidarity that exists for Ukraine in its time of need.

As winter arrives, Ukrainians are finding creative and resourceful ways to deal with the ongoing energy crisis caused by the war, reflecting the notion that electricity is civilization on the front lines. While the situation remains difficult, the country's reliance on alternative energy sources, traditional heating methods, and energy conservation measures demonstrates a remarkable level of resilience. With continued support from the international community and a commitment to innovation, Ukraine is determined to overcome the challenges of blackouts and ensure that its people can survive the harsh winter months ahead.

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UK Wind Power Surpasses Gas as offshore wind and solar drive record electricity generation, National Grid milestones, and net zero progress, despite grid capacity bottlenecks, onshore planning reforms, demand from heat pumps and transport electrification.

Key Points

A milestone where wind turbines generated more UK electricity than gas, advancing progress toward a net zero grid.

✅ Offshore wind delivered the majority of UK wind generation

✅ Grid connection delays stall billions in green projects

✅ Planning reforms may restart onshore wind development

Wind turbines have generated more electricity than gas, as wind becomes the main source for the first time in the UK.

In the first three months of this year a third of the country's electricity came from wind farms, as the UK set a wind generation record that underscored the trend, research from Imperial College London has shown.

National Grid has also confirmed that April saw a record period of solar energy generation, and wind and solar outproduced nuclear in earlier milestones.

By 2035 the UK aims for all of its electricity to have net zero emissions, after a 2019 stall in low-carbon generation highlighted the challenge.

"There are still many hurdles to reaching a completely fossil fuel-free grid, but wind out-supplying gas for the first time is a genuine milestone event," said Iain Staffell, energy researcher at Imperial College and lead author of the report.

The research was commissioned by Drax Electrical Insights, which is funded by Drax energy company.

The majority of the UK's wind power has come from offshore wind farms, and the country leads the G20 for wind's electricity share according to recent analyses. Installing new onshore wind turbines has effectively been banned since 2015 in England.

Under current planning rules, companies can only apply to build onshore wind turbines on land specifically identified for development in the land-use plans drawn up by local councils. Prime Minister Rishi Sunak agreed in December to relax these planning restrictions to speed up development.

Scientists say switching to renewable power is crucial to curb the impacts of climate change, which are already being felt, including in the UK, which last year recorded its hottest year since records began.

Solar and wind have seen significant growth in the UK, with wind surpassing coal in 2016 as a milestone. In the first quarter of 2023, 42% of the UK's electricity came from renewable energy, with 33% coming from fossil fuels like gas and coal.

But BBC research revealed on Thursday that billions of pounds' worth of green energy projects are stuck on hold due to delays with getting connections to the grid, as peak power prices also climbed amid system pressures.

Some new solar and wind sites are waiting up to 10 to 15 years to be connected because of a lack of capacity in the electricity system.

And electricity only accounts for 18% of the UK's total power needs. There are many demands for energy which electricity is not meeting, such as heating our homes, manufacturing and transport.

Currently the majority of UK homes use gas for their heating - the government is seeking to move households away from gas boilers and on to heat pumps which use electricity.

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UK Energy Network Profits are under scrutiny as Ofgem price controls, Citizens Advice claims, and National Grid margins spark debate over monopolies, allowed returns, consumer bills, rebates, and future investment under tougher regulation.

Key Points

UK Energy Network Profits are returns set by Ofgem for regulated grid operators, shaping consumer bills and investment

✅ Ofgem sets allowed returns for monopoly networks via price controls

✅ Dispute over interest rates, bond yields, and risk premiums

✅ Reforms proposed: shorter controls, tougher investor incentives

Companies that run Britain’s electricity and gas networks, including National Grid, are making “eye-watering” profits at the expense of households, according to a well-known consumer group.

Citizens Advice believes £7.5bn in “unjustified” profits should be returned to consumers who pay for network costs via their electricity and gas bills, with parallels seen in a deferred BC Hydro costs report abroad, although its figures have been contested by the energy industry and regulator.

Ownership of electricity and gas networks came under the spotlight in the run-up to June’s general election, after the Labour party said in its manifesto it would bring both national and regional grid infrastructure to back into public ownership, amid wider debates about grid privatization concerns elsewhere, over time.

Electricity sector privatisation began in 1990 and the gas industry was privatised in 1986. Energy network companies — which own and operate the cables and wires that help deliver electricity and gas to homes and businesses — are in effect monopolies that are regulated by Ofgem. Ofgem evaluates what their costs, including the cost of capital to finance investments, might be over an eight-year “price control” period, similar to determinations like the OEB decision on Hydro One rates in Ontario, Canada. Citizens Advice claims many of the regulator’s calculations for the most recent price control went “considerably in networks’ financial favour”.

It believes assumptions Ofgem made about factors such as the future path of interest rates and returns on government bonds were too generous, with international contrasts like power theft challenges in India illustrating different risk contexts, as was the regulator’s assessment of the risk associated with operating a network company. 

These “generous” assumptions will lead to network companies making average profit margins of 19 per cent and an average return of 10 per cent for their investors at the expense of consumers, Citizens Advice claims in a report published on Wednesday, which recommends a shorter price control period to allow for more accurate forecasting.

“Decisions made by Ofgem have allowed gas and electricity network companies to make sky-high profits that we’ve found are not justified by their performance,” said Gillian Guy, chief executive of Citizens Advice. Ofgem defended its regulatory regime, saying it helped to cut costs, improve reliability and customer satisfaction. 

“Ofgem has already cut costs to consumers by 6 per cent in the current price control and secured a rebate of over £4.5bn from network companies and is engaging with the industry to deliver further savings, with some regions seeing Ontario electricity rate reductions for businesses as well,” said Dermot Nolan, chief executive of the energy regulator.

Mr Nolan insisted the next price controls would be “tougher for investors”. The current price controls for the gas and electricity transmission networks, plus gas distribution, run until 2021 and until 2023 for local electricity distribution networks.

“While we don’t agree with its modelling and the figures it has produced, the Citizens Advice report raises some important issues about network regulation which will be addressed in the next control,” Mr Nolan said.

The Energy Networks Association, a trade body, refuted the claims of Citizens Advice, insisting that costs had fallen by 17 per cent in real terms since privatisation. The current regulatory framework was established after a public consultation, it said, adding that today’s report repeated several old claims that had previously been rejected by the Competition and Markets Authority.

“Our energy networks are among the most reliable and lowest cost in the world and their performance has never been better. In the next six years energy network companies are forecasted to deliver £45bn of investment in the UK economy,” a spokesman for the networks association added. National Grid said that since 2013 it had generated savings of £460m for bill payers.

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Costa Rica Renewable Energy Record highlights 99.99% clean power in May 2019, driven by hydropower, wind, solar, geothermal, and biomass, enabling ICE REM electricity exports and reduced rates from optimized generation totaling 984.19 GWh.

Key Points

May 2019 benchmark: Costa Rica generated 99.99% of 984.19 GWh from renewables, shifting from imports to regional exports.

✅ 99.99% renewable share across hydro, wind, solar, geothermal, biomass

✅ 984.19 GWh generated; ICE suspended imports and exported via REM

✅ Geothermal output increased to offset dry-season hydropower variability

During the whole month of May 2019, Costa Rica generated a total of 984.19 gigawatt hours of electricity, the highest in the country’s history. What makes this feat even more impressive is the fact that 99.99% of this energy came from a portfolio of renewable sources such as hydropower, wind, biomass, solar, and geothermal.

With such a high generation rate, the state power company Instituto Costariccense de Electricidad (ICE) were able to suspend energy imports from the first week of May and shifted to exports, while U.S. renewable electricity surpassed coal in 2022 domestically. To date, the power company continues to sell electricity to the Regional Electricity Market (REM) which generates revenues and is likely to reduce local electricity rates, a trend echoed in places like Idaho where a vast majority of electricity comes from renewables.

The record-breaking power generation was made possible by optimization of the country’s renewable sources, much as U.S. wind capacity surpassed hydro capacity at the end of 2016 to reshape portfolios. As the period coincided with the tail end of the dry season, the geothermal quota had to be increased.

Costa Rica remains a leader in renewable power generation, whereas U.S. wind generation has become the most-used renewable source in recent years. In 2015, more than 98% of the country’s electrical generation came from renewable sources, while U.S. renewables hit a record 28% in April in one recent benchmark. Through the years, this figure has remained fairly constant despite dry bouts caused by the El Niño phenomenon, and U.S. solar generation also continued to rise.

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