The world’s first demonstration of a subsea geothermal power plant has taken place near an active underwater volcano almost a mile below the ocean surface. It generated less than 10 seconds of net-positive electricity but showed the technical feasibility of tapping another form of renewable energy underwater.

The three-week test deployment of the 3-ton prototype power plant took place at the Axial Seamount in the northeast Pacific Ocean in September. Endurance Energy, the Seattle-based startup behind the effort, aims to eventually commercialize subsea geothermal power for Pacific island nations and other customers looking for alternatives to importing expensive fossil fuels.

“The deep ocean gives us unlimited cold seawater for cooling, and its weight keeps the system and the well pressurized, so our plants can be compact,” said Andrew Redd, founder and CEO of Endurance Energy, in an email to Ars.

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Warm homes plan would create 50,000 jobs, compared with about 1,100 for Rosebank oilfield, thinktank finds

Insulating Britain’s homes and investing in heat pumps would do more to cut the cost of living, create jobs and boost the UK’s economy than drilling for new oil, research suggests.

The government’s £15bn warm homes plan, currently under threat of cuts as ministers seek budget savings, would slash £1bn a year from household energy bills across the UK, concentrated on those on low incomes, according to research by the thinktank E3G. It would also provide a £1.6bn yearly boost to the economy, and about 50,000 new jobs spread across thousands of small businesses.

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© Photograph: Murdo MacLeod/The Guardian

© Photograph: Murdo MacLeod/The Guardian

© Photograph: Murdo MacLeod/The Guardian

Grid operator paying large sums to switch off windfarms in areas of excess electricity generation while turning on gas plants elsewhere

The cost of balancing Great Britain’s power grid has soared to near-record highs of almost £50m a day after windfarms were turned off because of bottlenecks in transmitting power around the country.

The grid operator paid £47.9m on Wednesday to turn windfarms off in areas with an oversupply of electricity and turn gas plants on in areas where supplies were tight.

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© Photograph: Robin Weaver/Alamy

© Photograph: Robin Weaver/Alamy

© Photograph: Robin Weaver/Alamy

Tories plan to scrap low-carbon housebuilding, Greens back new nuclear reactors, and Labour put oil-drilling decisions on hold

New homes could be built without solar panels, heat pumps and high-grade insulation, leading to higher household bills if the Conservative party wins the next general election.

Kemi Badenoch made scrapping the future homes standard (FHS) one of the central planks of her bid to become the next prime minister at the Tory party conference this week.

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© Photograph: Tolga Akmen/EPA

© Photograph: Tolga Akmen/EPA

© Photograph: Tolga Akmen/EPA

Complaints risks putting defence ministry on collision course with Department for Energy Security and Net Zero

The Ministry of Defence has objected to at least four planned windfarms in the past year over fears the spinning blades could cause “unacceptable interference” with radars used to detect military aircraft.

MoD officials raised concerns in late June over plans for an onshore windfarm in County Durham that could result in aircraft “not being detected” within an RAF Low Flying Area, according to a letter to Britain’s planning authority.

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© Photograph: AFP/Getty Images

© Photograph: AFP/Getty Images

© Photograph: AFP/Getty Images

The Naylors’ four-bedroom home in Milton Keynes acts like a mini-power station after retrofitting solar panels, a battery and a heat pump

Clare Naylor paid close attention to how much energy she and her family were using last winter, filling hot-water bottles and bringing out extra blankets to ensure they didn’t go over budget. This year, she won’t have to worry as she is guaranteed not to receive a bill.

While millions of British households face the highest energy charges in three years from this week after a 4% rise in the price cap, and predictions of a 16% increase in January, upgrades to Naylor’s home mean she will not have to pay a thing.

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© Photograph: Teri Pengilley/The Guardian

© Photograph: Teri Pengilley/The Guardian

© Photograph: Teri Pengilley/The Guardian

Energy Secretary Chris Wright is pitching a future of fossil fuel abundance. It’s not always an easy sell while war drags on and oil prices surge.

© Ronaldo Schemidt/Agence France-Presse — Getty Images

The lawsuit, filed by Michigan, claimed oil companies colluded to obstruct solar power and to misrepresent climate risks, making energy costlier.

© Rebecca Cook/Reuters

Five years after virtually every world leader agreed to “phase down” the burning of coal for climate reasons, the fuel is more widely used than ever.

© Ahmad Mulia Panjaitan/Associated Press

The state is considering extending the life of its last nuclear power plant, Diablo Canyon, and allowing construction of new reactors to help meet its clean energy goals.