China experiments with solar-thermal power

By PhysicsWeb


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Construction is due to start in April on an experimental solar–thermal power plant in the shadow of China’s Great Wall that will bring clean energy to 30,000 households by 2010.

Built on the outskirts of Beijing at a cost of £10m, the 1.5 MW Dahan plant will cover an area the size of 10 football pitches, and will serve as a platform for experiments on different solar-power technologies.

Unlike photovoltaic solar panels, which produce electricity directly from sunlight, solar–thermal power is based on an array of mirrors that focus the Sun’s rays onto a receiver. Several solar-thermal plants are already operating elsewhere in the world — notably in California’s Mojave Desert and in Granada in Spain — but the Dahan facility will be the first of its kind in Asia.

“The actual amount of power generated is small, but it is a big step for China to go into solar-thermal power generation using its own designs,” says Christoph Richter, site manager of the German Aerospace Centre at the Plataforma Solar de Alméria, a solar-power research centre in Tabernas, Spain.

The Chinese design relies on 100 curved “heliostat” mirrors that track the Sun’s movement across the sky and redirect light onto a receiver atop a 100 metre–high central tower. Water flowing through the receiver is transformed into superheated steam, which can then drive electricity-generating turbines as in a conventional power plant. Surplus energy is stored as heat, with a tank of synthetic oil serving as a reservoir for the high temperature (350°C) heat needed to produce superheated steam, and a second system “downstream” to store heat at lower temperatures.

Such two stage thermal storage boosts the plantÂ’s efficiency, notes Zhihao Yao, a researcher at the Laboratory of Solar Thermal Energy in Beijing and member of the Dahan design team. The oil used in the Dahan storage system is also cheaper than the molten salts used to store heat at the Spanish facility, in part because the saltsÂ’ high melting point means that such systems must be drained when the plant is not in use.

Keeping costs down is important. “In China, the cost for using their own coal is unbeatable, unless you factor in the environmental damage,” says Richter. Another snag is the large amount of land needed. David Faiman, director of Israel’s Ben-Gurion National Solar Energy Center, notes that China’s energy demand increased by about 430 terawatt–hours in 2007, and simply keeping up with this expansion would require devoting about 3,000 square kilometres of the Gobi desert each year to solar-thermal power. Still, the fact that China is investing in solar power on any scale is a “favourable sign”, he adds.

The next step for the Chinese will be to enlarge the Dahan plant to 5–10 MW. This will happen by 2015, deputy project leader Li Xin told physicsworld.com. A separate 1,000 MW plant is being planned for the Chinese province of Inner Mongolia, with support from Solar Millennium, the German firm that built the plant in Granada, but this commercial–scale facility is still a few years away.

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City officials take clean energy message to Georgia Power, PSC

Georgia Cities Clean Energy IRP Coalition unites Savannah, Atlanta, Decatur, and Athens-Clarke to shape Georgia Power's Integrated Resource Plan, accelerating renewables, energy efficiency, community solar, and coal retirements through Georgia Public Service Commission hearings.

 

Key Points

Georgia cities working to steer Georgia Power's IRP toward renewables, energy efficiency, and community solar.

✅ Targets coal retirements and doubling renewables by 2035

✅ Advocates data access, transparency, and energy efficiency

✅ Seeks affordable community solar options for low-income customers

 

Savannah is among several Georgia cities that have led the charge forward in recent years to push for clean energy. Now, several of the state's largest municipalities are banding together to demand action from Georgia's largest energy provider.

Hearings regarding Georgia Power's Integrated Resource Plan (IRP) happen every three years, but this year for the first time the cities of Savannah, Decatur, Atlanta and Athens-Clarke and DeKalb counties were at the table.

"It's pretty unprecedented. It's such an important opportunity to get to represent ourselves and our citizens," said City of Savannah Energy Analyst Alicia Brown, the Savannah representative for the Georgia Coalition for Local Governments.

The IRP, which essentially maps out how the company will use its various forms of energy over the next 20 years was filed with the Georgia Public Service Commission (GPSC) in January, the 200-page IRP outlines Georgia Power's plans to shutter nearly all Georgia Power-controlled coal units, similar to Tucson Electric Power's coal exit timelines elsewhere, which could begin later this year.

The company is also planning to double its renewable energy generation by 2035. The IRP also outlines plans for several programs, including an Income-Qualified Community Solar Pilot, reflecting momentum for community energy programs in other states as well.

During the hearings the coalition, alongside the other groups, had the ability to question Georgia Power officials about the plan to include the proposed increase per kilowatt for the company's Simple Solar program, Behind-the-Meter Solar program study and various other components, amid debates over solar strategy in the South that could impact lower income customers.

"The established and open IRP process is central to effective, long-term energy planning in Georgia and is part of our commitment to 2.7 million customers to deliver clean, safe, reliable and affordable energy. In continuing our longstanding relationship with the City of Savannah, we welcome their interest and participation in the IRP process," John Kraft, Georgia Power spokesman said in an email.

Brown said the coalition's areas of interest fall into three categories: energy efficiency and demand response, data access and transparency and renewable energy for citizens as well as the governments in the coalition.

"We have these renewable goals and just the way the current regulations are set, the way the current laws are on the books, and developments like consumer choice in California show how policy shifts can reshape utility markets, it's very challenging for us to meet those renewable energy goals without Georgia Power setting up programs that are workable for us," she said.

The city of Savannah is already taking action locally to reduce carbon emissions and move toward clean and renewable energy through the 100% Savannah Clean Energy Plan, which was adopted by Savannah City Council in December.

The plan aims to achieve 100% renewable electricity community-wide by 2035 and 100% renewable energy for all energy needs by 2050.

Council previously approved the 100% Clean Energy Resolution needed to develop the plan in March 2020, making Savannah the fifth city in the state to pledge to pursue a lower carbon future to fight climate change.

The final plan includes 45 strategies that fall into five categories: energy efficiency; renewable energy; transportation and mobility; community and economic development; and education and engagement.

Brown said the education and engagement component is central to the plan, but the pandemic has hindered community education and awareness efforts, and utilities have warned customers about pandemic-related scams that complicate outreach, something the city hopes to catapult in the coming weeks.

"With the 100% Savannah resolution passing right before the pandemic, we haven't had as many opportunities to raise awareness about the initiative and to educate the public about clean energy as we would like. This transition will present a lot of opportunities for our communities, but only if people know that they are there to be taken," she said.

"... We also want to engage the community so that they feel like they are developing this vision for a healthy, prosperous, clean community alongside us. It's not just us telling them, 'we're going to have a clean energy future and it's going to look like this,' but really helping them to develop and realize a collective vision for what 100% Savannah should be."

The final round of IRP hearings are scheduled for next month. Those hearings will allow the coalition and other groups to put witnesses on the stand who will make the case for why Georgia Power's IRP should be different, Brown said.

In June, Georgia Power, following a June bill reduction for customers, will have a chance to offer rebuttal testimony and will again be subject to cross examination. Shortly after those hearings, the parties will join together for the settlement process, a sort of compromise on the plan that the commission will vote on toward the beginning of July.

 

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Britons could save on soaring bills as ministers plan to end link between gas and electricity prices

UK Electricity-Gas Price Decoupling aims to reform wholesale electricity pricing under the Energy Security Bill, shielding households from gas price spikes, supporting renewables, and easing the cost-of-living crisis through market redesign and transparent tariffs.

 

Key Points

Policy to decouple power prices from gas via the Energy Security Bill, stabilizing bills and reflecting renewables

✅ Breaks gas-to-power pricing link to cut electricity costs

✅ Reduces volatility; shields households from global gas shocks

✅ Highlights benefits of renewables and market transparency

 

Britons could be handed relief on rocketing household bills under Government plans to sever the link between the prices of gas and electricity, including proposals to restrict energy prices in the market, it has emerged.

Ministers are set to bring forward new laws under the Energy Security Bill to overhaul the UK's energy market in the face of the current cost-of-living crisis.

They have promised to provide greater protection for Britons against global fluctuations in energy prices, through a price cap on bills among other measures.

The current worldwide crisis has been exacerbated by the Ukraine war, which has sent gas prices spiralling higher.

Under the current make-up of Britain's energy market, soaring natural gas prices have had a knock-on effect on electricity costs.

But it has now been reported the new legislation will seek to prevent future shocks in the global gas market having a similar impact on electricity prices.

Yet the overhaul might not come in time to ease high winter energy costs for households ahead of this winter.

According to The Times, Business Secretary Kwasi Kwarteng will outline proposals for reforms in the coming weeks.

These will then form part of the Energy Security Bill to be introduced in the autumn, with officials anticipating a decrease in energy bills by April.

The newspaper said the plans will end the current system under which the wholesale cost of gas effectively determines the price of electricity for households.

Although more than a quarter of Britain's electricity comes from renewable sources, under current market rules it is the most expensive megawatt needed to meet demand that determines the price for all electricity generation.

This means that soaring gas prices have driven up all electricity costs in recent months, even though only around 40% of UK electricity comes from gas power stations.

Energy experts have compared the current market to train passengers having to pay the peak-period price for every journey they make.

One Government source told The Times: 'In the past it didn’t really matter because the price of gas was reasonably stable.

'Now it seems completely crazy that the price of electricity is based on the price of gas when a large amount of our generation is from renewables.'

It was also claimed ministers hope the reforms will make the market more transparent and emphasise to consumers the benefits of decarbonisation, amid an ongoing industry debate over free electricity for consumers.

A Government spokesperson said: 'The high global gas prices and linked high electricity prices that we are currently facing have given added urgency to the need to consider electricity market reform.

 

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EPA Policy to limit telework emerges during pandemic

EPA Telework Policy restricts remote work, balancing work-from-home guidance during the COVID-19 pandemic with flexible schedules, union contracts, OMB guidance, and federal workforce rules, impacting managers, SES staff, and non-bargaining employees nationwide.

 

Key Points

A directive limiting many EPA staff to two telework days weekly, with pandemic exceptions and flexible schedules.

✅ Limits telework to two days per week for many employees

✅ Allows flexible schedules, including maxiflex, during emergencies

✅ Aligns with OMB, OPM, CDC guidance; honors union agreements

 

EPA has moved forward on a new policy that would restrict telework even as agency leadership has encouraged staff to work from home during the coronavirus outbreak.

The new EPA order obtained by E&E News would require employees to report to the office at least three days every week.

"Full-time employees are expected to report to the official worksite and duty station a minimum of three (3) days per week," says the order, dated as approved on Feb. 27. It went into effect March 15 — that night, EPA Administrator Andrew Wheeler authorized telework for the entire agency due to the pandemic.

The order focuses on EPA employees' work schedules and gives them new flexibilities that could come in handy during a public health emergency like the COVID-19 virus, when parts of the power sector consider on-site staffing to ensure continuity.

It also stipulates a deep reduction in EPA employees' capability to work remotely, leaving them with two days of telework per week. An agency order on telework, issued in January 2016, said staff could telework full time.

"The EPA supports the use of telework," said that order. "Regular telework may range from one day per pay period up to full time."

An EPA spokeswoman said the new order doesn't change the agency's guidance to staff to work from home during the pandemic.

"The health and safety of our employees is our top priority, and that is why we have requested that all employees telework, even as residential electricity use increases with more people at home, until at least April 3. There is no provision in the work schedules policy, telework policy or collective bargaining agreement that limits this request," said the spokeswoman.

"While EPA did implement the national work schedule policy effective 3/15/2020, it was implemented in order to provide increased work schedule flexibilities for non-bargaining unit employees who were not previously afforded flexible schedules, including maxiflex," she added.

"The implementation of the policy does not currently impact telework opportunities for EPA employees, and EPA has strongly encouraged all staff to telework," she said.

Still, the new order has caused consternation among EPA employees.

One EPA manager described it as another move by the Trump administration to restrict telework across the government.

"Amidst the COVID-19 crisis, this policy seems particularly ill-timed and unwise. It doesn't even give the administration the chance to evaluate the situation once the COVID-19 pandemic passes," said the manager.

"I think this is a dramatic change in the flexibilities available to the EPA employees without any data to support such a drastic move," the manager said. "It has huge ramifications for employees, many of whom commute over an hour each way to the office, increasing air pollution in the process."

Another EPA staffer said, "I honestly think such an order, given current circumstances, would elicit little more than a scoff and a smirk."

The person added, "How tone-deaf and heavy-handed can one administration be?"

Inside EPA first reported on the new order. E&E News obtained the memo independently.

The recently issued policy applies only to non-bargaining-unit employees, including "full-time and part-time" agency staff as well as "supervisors and managers in the competitive, excepted, Senior Level, Scientific and Professional, and Senior Executive Service positions."

In addition, the order covers "Public Health Service Officers, Schedule C, Administratively Determined employees and non-EPA employees serving on Intergovernmental Personnel Act assignments to EPA."

Nevertheless, EPA employees covered under union contracts must adhere to those contracts if the policy runs counter to them.

"If provisions of this order conflict with the provisions of a collective bargaining agreement, the provisions of the agreement must be applied," the order says.

EPA has taken a more restrictive approach with the agency's largest union, American Federation of Government Employees Council 238, which represents about 7,500 EPA employees. EPA imposed a contract on the council's bargaining unit employees last July that limited them to one day of telework per week, among other changes that triggered union protests.

EPA and AFGE have since relaunched contract negotiations, and how to handle telework is one of the issues under discussion. Both sides committed to complete those bargaining talks by April 15 and work with the Federal Service Impasses Panel if needed (Greenwire, Feb. 27).

 

Both sides of the telework debate
EPA's new order has been under consideration for some time.

E&E News obtained a draft version last year. The agency had circulated it for comment in July, noting the proposal "limits the number of days an employee may telework per week," among other changes (Greenwire, Sept. 12, 2019).

EPA, like other federal agencies under the Trump administration, has sought to reduce employees' telework. That effort, though, has run into the headwinds of a global pandemic, with a U.S. grid warning highlighting broader risks, leading agency leaders to reverse course and now encourage staff to work remotely in order to stop the spread of the COVID-19 virus.

Wheeler in an email last week told staff that he authorized telework for employees across the country. Federal worker unions had sought the opportunity for remote work on behalf of EPA employees, and the agency had already relaxed telework policies at various offices the prior week where the coronavirus had begun to take hold.

The EPA spokeswoman said the agency moved toward telework after guidance from other agencies.

"Consistent with [Office of Management and Budget], [Centers for Disease Control and Prevention] and [Office of Personnel Management] guidance, along with state and local directives, we have taken swift action in regions and at headquarters to implement telework for all employees. We continue to tell all employees to telework," said the spokeswoman.

Wheeler said in a later video message that his expectation was most EPA employees were working from home.

"I understand that this is a difficult and scary time for all of us," said the EPA administrator.

The coronavirus has become a real challenge for EPA, and utilities like BC Hydro Site C updates illustrate broader operational adjustments.

Agency staff have been exposed to the virus while some have tested positive, and nuclear plant workers have raised similar concerns, according to internal emails. That has led to employees self-quarantining while their colleagues worry they may next fall ill (Greenwire, March 20).

One employee said that since EPA's operations have been maintained with staff working from home, even as household electricity bills rise for many, it's harder for the Trump administration to justify restricting remote work.

"With the current climate, I think employees have shown we can keep the agency going with nearly 95% teleworking full time. It makes their argument hard to justify in light of things," said the EPA employee.

The Trump administration overall has pushed for more remote work by the federal workforce in the battle with the COVID-19 virus. The Office of Management and Budget issued guidance to agencies last week "to minimize face-to-face interactions" and "maximize telework across the nation."

Lawmakers have also pushed to expand telework for federal workers due to the virus.

Democratic senators sent a letter last week urging President Trump to issue an executive order directing agencies to use telework.

In addition, Sens. James Lankford (R-Okla.), Chris Van Hollen (D-Md.) and Kyrsten Sinema (D-Ariz.) introduced legislation that would allow federal employees to telework full time during the pandemic.

Some worry EPA's new order could further sour morale at the agency after the pandemic passes, as other utilities consider measures like unpaid days off to trim costs. Employees may leave if they can't work from home more.

"People will quit EPA over something like this. Maybe that's the goal," said the EPA manager.

 

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Hydro-Québec puts global ambitions on hold as crisis weighs on demand

Hydro-Que9bec COVID-19 M&A Pause signals a halt to international expansion as falling electricity demand, weaker exports, and revenue pressure shift capital to the Quebec economy, prioritizing domestic investment, strategic plan revisions, and risk management.

 

Key Points

Hydro-Que9bec COVID-19 M&A Pause halts overseas deals, shifting investment to Quebec as demand, exports and revenue fall.

✅ International M&A on hold; capital reallocated to Quebec projects

✅ Lower electricity demand reduces exports and spot prices

✅ Strategic plan and 2020 guidance revised downward

 

COVID-19 is forcing Hydro-Québec to pull the plug on its global ambitions — for now, even as its electricity ambitions have reopened old wounds in Newfoundland and Labrador in recent years.

Quebec’s state-owned power generator and distributor has put international mergers and acquisitions on hold for the foreseeable future because of the COVID-19 crisis, chief financial officer Jean-Hugues Lafleur said Friday.

Former chief executive officer Éric Martel, who left last month, had made foreign expansion a key tenet of his growth strategy.

“We’re in revision mode” as pertains to acquisitions, Lafleur told reporters on a conference call, as the company pursues a long-term strategy to wean the province off fossil fuels at home as well. “I don’t see how Hydro-Québec could take $5 billion now and invest it in Chile because we have an investment opportunity there. Instead, the $5 billion will be invested here to support the Quebec economy. We’re going to make sure the Quebec economy recovers the right way before we go abroad.”

Lafleur spoke after Hydro-Québec reported a 14-per-cent drop in first-quarter profit and warned full-year results will fall short of expectations as COVID-19 weighs on power demand.

Net income in the three-month period ended March 31 was $1.53 billion, down from $1.77 billion a year ago, Hydro-Québec said in a statement. Revenue fell about six per cent to $4.37 billion.

“Due to the economic downturn resulting from the current crisis, we’re anticipating lower electricity sales in all of our markets,” Lafleur said. “Consequently, the financial outlook for 2020 set out in the strategic plan 2020–2024, which also reflects the province’s no-nuclear stance, will be revised downward.”

It’s still too early to determine the scope of the revision, the company said in its quarterly report. Hydro-Québec was targeting net income of between $2.8 billion and $3 billion in 2020, according to its strategic plan.

The first quarter was the utility’s last under Martel, who quit to take over at jetmaker Bombardier Inc. Quebec appointed former Énergir CEO Sophie Brochu to replace him, effective April 6.

First-quarter results “weren’t significantly affected” by the pandemic, Lafleur said on a conference call with reporters. Electricity sales generated $294 million less than a year ago due primarily to milder temperatures, he said.

Results will start to reflect COVID-19’s impact in the second quarter, though NB Power has signed three deals to bring more Quebec electricity into the province that could cushion some exports.

Electricity consumption in Quebec has fallen five per cent in the past two months, paced by an 11-per-cent plunge for commercial and institutional clients, and cities such as Ottawa saw a demand plunge during closures.

Industrial customers such as pulp and paper producers have also curbed power use, and it’s hard to see demand rebounding this year, Lafleur said.

“What we’ve lost since the start of the pandemic is not coming back,” he said.

Demand on export markets, meanwhile, has shrunk between six per cent and nine per cent since mid-March. The drop has been particularly steep in Ontario, reaching as much as 12 per cent, after the province chose not to renew its electricity deal with Quebec earlier this year, compared with declines of up to five per cent in New England and eight per cent in New York.

Spot prices in the U.S. have retreated in tandem, falling this week to as low as 1.5 U.S. cents per kilowatt-hour, Lafleur said. Hydro-Québec’s hedging strategy — which involves entering into fixed-price sales contracts about a year ahead of time — allowed the company to export power for an average of 4.9 U.S. cents per kilowatt-hour in the first quarter, compared with the 2.2 cents it would have otherwise made.

Investments will decline this year as construction activity proceeds at reduced speed, Lafleur said. Hydro-Québec was initially planning to invest about $4 billion in the province, he said, as it works to increase hydropower capacity to more than 37,000 MW across its fleet.

Physical distancing measures “are having an impact on productivity,” Lafleur said. “We can’t work the way we wanted, and project costs are going to be affected. Anytime we send workers north on a plane, we need to leave an empty seat beside them.”

 

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KHNP is being considered for Bulgarian Nuclear Power Plant Project

KHNP Shortlisted for Belene Nuclear Power Plant, named by the Bulgarian Energy Ministry alongside Rosatom and CNNC; highlights APR1400 reactor expertise, EPC credentials, and expansion into the European nuclear energy market.

 

Key Points

KHNP is a strategic investor candidate for Bulgaria's Belene NPP, leveraging APR1400 and European market entry.

✅ Selected with Rosatom and CNNC by Bulgarian Energy Ministry

✅ Builds on APR1400 reactor design and EPC track record

✅ Positions KHNP for EU nuclear projects and O&M services

 

Korea Hydro & Nuclear Power (KHNP) has been selected as one of the three strategic investor candidates for a Bulgarian nuclear power plant project amid global nuclear project milestones worldwide.

The Bulgarian Energy Ministry selected KHNP of Korea, RosAtom of Russia and CNNC of China as strategic investor candidates for the construction of the Belene Nuclear Power Plant, KHNP said on Dec. 20. The Belene Nuclear Power Plant is the second nuclear power plant that Bulgaria plans to build following the 2,000-megawatt Kozloduy Nuclear Power Plant built in 1991 during the Soviet Union era. The project budget is estimated at 10 billion euros.

By being included in the shortlist for the Bulgarian project, KHNP has boosted the possibility of making a foray into the European nuclear power plant market, as India takes steps to get nuclear back on track worldwide. KHNP began to export nuclear power plants in 2009 by winning the UAE Barakah Nuclear Power Plant Project, with Barakah Unit 1 reaching 100% power as it moves toward commercial operations. The UAE plant will be based on the APR1400, a next-generation Korean nuclear reactor that is used in Shin Kori Units 3 and 4 in Korea.

The ARP1400 is a Korean nuclear reactor developed by KHNP with investment of about 230 billion won for 10 years from 1992. The nuclear reactor became the first non-U.S. type reactor to receive a design certificate (DC) from the U.S. Nuclear Regulatory Commission (NRC), as China's nuclear energy program continues on a steady development track globally. By receiving the DC, its safety was internationally recognized. In June, the company also won the maintenance project for the Barakah Nuclear Power Plant, completing the entire cycle from the construction of the nuclear power plant to its design, operation and maintenance. However, U.S. and U.K. companies took part of the maintenance project for the nuclear power plant.

In July, KHNP officials visited Turkey and contacted local energy officials to prepare for nuclear power plant projects to be launched in that country, as Bangladesh develops nuclear power with IAEA assistance in the region. Earlier in May, the company also submitted a proposal to participate in the construction of a new nuclear power plant in Kazakhstan, while Kenya moves forward with plans for a $5 billion plant.

 

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Bill Gates’ Nuclear Startup Unveils Mini-Reactor Design Including Molten Salt Energy Storage

Natrium small modular reactor pairs a sodium-cooled fast reactor with molten salt storage to deliver load-following, dispatchable nuclear power, enhancing grid flexibility and peaking capacity as TerraPower and GE Hitachi pursue factory-built, affordable deployment.

 

Key Points

A TerraPower-GE Hitachi SMR joining a sodium-cooled reactor with molten salt storage for flexible, dispatchable power.

✅ 345 MW base; 500 MW for 5.5 hours via thermal storage

✅ Sodium-cooled coolant and molten salt storage enable load-following

✅ Backed by major utilities; factory-built modules aim lower costs

 

Nuclear power is the Immovable Object of generation sources. It can take days just to bring a nuclear plant completely online, rendering it useless as a tool to manage the fluctuations in the supply and demand on a modern energy grid.  

Now a firm launched by Bill Gates in 2006, TerraPower, in partnership with GE Hitachi Nuclear Energy, believes it has found a way to make the infamously unwieldy energy source a great deal nimbler, drawing on next-gen nuclear ideas — and for an affordable price. 

The new design, announced by TerraPower on August 27th, is a combination of a "sodium-cooled fast reactor" — a type of small reactor in which liquid sodium is used as a coolant — and an energy storage system. While the reactor could pump out 345 megawatts of electrical power indefinitely, the attached storage system would retain heat in the form of molten salt and could discharge the heat when needed, increasing the plant’s overall power output to 500 megawatts for more than 5.5 hours. 

“This allows for a nuclear design that follows daily electric load changes and helps customers capitalize on peaking opportunities driven by renewable energy fluctuations,” TerraPower said. 

Dubbed Natrium after the Latin name for sodium ('natrium'), the new design will be available in the late 2020s, said Chris Levesque, TerraPower's president and CEO.

TerraPower said it has the support of a handful of top U.S. utilities, including Berkshire Hathaway Energy subsidiary Pacificorp, Energy Northwest, and Duke Energy. 

The reactor's molten salt storage add-on would essentially reprise the role currently played by coal- or gas-fired power stations or grid-scale batteries: each is a dispatchable form of power generation that can quickly ratchet up or down in response to changes in grid demand or supply. As the power demands of modern grids become ever more variable with additions of wind and solar power — which only provide energy when the wind is blowing or the sun shining — low-carbon sources of dispatchable power are needed more and more, and Europe is losing nuclear power at a difficult moment for energy security. California’s rolling blackouts are one example of what can happen when not enough power is available to be dispatched to meet peak demand. 

The use of molten salt, which retains heat at extremely high temperatures, as a storage technology is not new. Concentrated solar power plants also collect energy in the form of molten salt, although such plants have largely been abandoned in the U.S. The technology could enjoy new life alongside nuclear plants: TerraPower and GE Hitachi Nuclear are only two of several private firms working to develop reactor designs that incorporate molten salt storage units, including U.K.- and Canada-based developer Moltex Energy.

The Gates-backed venture and its partner touted the "significant cost savings" that would be achieved by building major portions of their Natrium plants through not a custom but an industrial process — a defining feature of the newest generation of advanced reactors is that their parts can be made in factories and assembled on-site — although more details on cost weren't available. Reuters reported earlier that each plant would cost around $1 billion.

NuScale Power

A day after TerraPower and GE Hitachi's unveiled their new design, another nuclear firm — Portland, Oregon-based NuScale Power — announced that the U.S. Nuclear Regulatory Commission (NRC) had completed its final safety evaluation of NuScale’s new small modular reactor design.

It was the first small modular reactor design ever to receive design approval from the NRC, NuScale said. 

The approval means customers can now pursue plans to develop its reactor design confident that the NRC has signed off on its safety aspects. NuScale said it has signed agreements with interested parties in the U.S., Canada, Romania, the Czech Republic, and Jordan, and is in the process of negotiating more. 

NuScale previously said that construction on one of its plants could begin in Utah in 2023, with the aim of completing the first Power Module in 2026 and the remaining 11 modules in 2027.

NuScale
An artist’s rendering of NuScale Power’s small modular nuclear reactor plant. NUSCALE POWER
NuScale’s reactor is smaller than TerraPower’s. Entirely factory-built, each of its Power Modules would generate 60 megawatts of power. The design, typical of advanced reactors, uses pressurized water reactor technology, with one power plant able to house up to 12 individual Power Modules. 

In a sign of the huge amounts of time and resources it takes to get new nuclear technology to the market’s doorstep, NuScale said it first completed its Design Certification Application in December 2016. NRC officials then spent as many as 115,000 hours reviewing it, NuScale said, in what was only the first of several phases in the review process. 

In January 2019, President Donald Trump signed into law the Nuclear Energy Innovation and Modernization Act (NEIMA), designed to speed the licensing process for advanced nuclear reactors, and the DOE under Secretary Rick Perry moved to advance nuclear development through parallel initiatives. The law had widespread bipartisan support, underscoring Democrats' recent tentative embrace of nuclear power.

An industry eager to turn the page

After a boom in the construction of massive nuclear power plants in the 1960s and 70s, the world's aging fleet of nuclear plants suffers from rising costs and flagging public support. Nuclear advocates have for years heralded so-called small modular reactors or SMRs as the cheaper and more agile successors to the first generation of plants, and policy moves such as the UK's green industrial revolution lay out pathways for successive waves of reactors. But so far a breakthrough on cost has proved elusive, and delays in development timelines have been abundant. 

Edwin Lyman, the director of nuclear power safety at the Union of Concerned Scientists, suggested on Twitter that the nuclear designs used by TerraPower and GE Hitachi had fallen short of a major innovation. “Oh brother. The last thing the world needs is a fleet of sodium-cooled fast reactors,” he wrote.  

Still, climate scientists view nuclear energy as a crucial source of zero-carbon energy, with analyses arguing that net-zero emissions may be impossible without nuclear in many scenarios, if the world stands a chance at limiting global temperature increases to well below 2 degrees Celsius above pre-industrial levels. Nearly all mainstream projections of the world’s path to keeping the temperature increase below those levels feature nuclear energy in a prominent role, including those by the United Nations and the International Energy Agency (IEA). 

According to the IEA: “Achieving the clean energy transition with less nuclear power is possible but would require an extraordinary effort.”

 

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