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The world’s biggest provider of wind and solar energy is now more valuable than the giant oil company Exxon Mobil, “once the largest public company on Earth,” reports Bloomberg:

NextEra ended Wednesday with market value of $145 billion, topping Exxon’s $142 billion… NextEra has emerged as the world’s most valuable utility, largely by betting big on renewables, especially wind. Exxon has seen its fortunes shift in the other direction as electric vehicles become more widespread and the fight against climate change takes on more urgency. “People believe that renewable energy is a growth story and that oil and gas is a declining story,” said Jigar Shah, co-founder of the green financier Generate.

NextEra had about 18 gigawatts of wind and solar farms at the end of last year, enough to power 13.5 million homes. And it’s expanding significantly, with contracts to add another 12 gigawatts of renewables. Its shares have surged more than 20% this year. At the same time, Exxon’s shares have tumbled more than 50% as the pandemic quashed global demand for fuels. The company’s second-quarter loss was its worst of the modern era and, in August, Exxon was ejected from the Dow Jones Industrial Average. The company was worth $525 billion in 2007, more than three times its current value.

Peter McNally, an energy expert at research firm Third Bridge, tells ExtremeTech that it all comes down to the cheaper price of renewable energy.

“Alternative power is now getting competitive with traditional forms of electricity, coal and natural gas fired generation.”

A nuclear energy venture founded by Bill Gates said Thursday it hopes to build small advanced nuclear power stations that can store electricity to supplement grids increasingly supplied by intermittent sources like solar and wind power. Reuters reports:
The effort is part of the billionaire philanthropist’s push to help fight climate change, and is targeted at helping utilities slash their emissions of planet-warming gases without undermining grid reliability. TerraPower LLC, which Gates founded 14 years ago, and its partner GE Hitachi Nuclear Energy, plan to commercialize stations called Natrium in the United States later this decade, TerraPower’s President and Chief Executive Chris Levesque said.

Levesque said the companies are seeking additional funding from private partners and the U.S. Energy Department, and that the project has the support of PacifiCorp, owned by billionaire Warren Buffett’s Berkshire Hathaway, along with Energy Northwest and Duke Energy. If successful, the plan is to build the plants in the United States and abroad, Levesque said. By 2050 “we would see hundreds of these reactors around the world, solving multiple different energy needs,” Levesque said. The 345-megawatt plants would be cooled by liquid sodium and cost about $1 billion each.

The new plants […] are designed to complement a renewable power because they will store the reactor power in tanks of molten salt during days when the grid is well supplied. The nuclear power could be used later when solar and wind power are low due to weather conditions. Molten salt power storage has been used at thermal solar plants in the past, but leaks have plagued some of the projects. Levesque said the Natrium design would provide more consistent temperatures than a solar plant, resulting in less wear and tear.

One of the big challenges of making 100 percent renewable energy [sic] a reality is long-term storage,” says Julian Hunt, an engineering scientist at the International Institute for Applied Systems Analysis in Austria. Hunt and his collaborators have devised a novel system to complement lithium-ion battery use for energy storage over the long run: Mountain Gravity Energy Storage, or MGES for short. Similar to hydroelectric power, MGES involves storing material at elevation to produce gravitational energy. The energy is recovered when the stored material falls and turns turbines to generate electricity. The group describes its system in a paper published November 6 in Energy.

“Instead of building a dam, we propose building a big sand or gravel reservoir,” explains Hunt. The key to MGES lies in finding two mountaintop sites that have a suitable difference in elevation — 1,000 meters is ideal. “The greater the height difference, the cheaper the technology,” he says. The sites will look similar, with each comprised of a mine-like station to store the sand or gravel, and a filling station directly below it. Valves release the material into waiting vessels, which are then transported via cranes and motor-run cables to the upper site. There, the sand or gravel is stored — for weeks, months, or even years — until it’s ready to be used. When the material is moved back down the mountain, that stored gravitational energy is released and converted into electrical energy.

Not only is the system more environmentally friendly [sic] than pumped-storage hydropower and dams, but it’s more flexible to meet varying energy demands.

“Hunt estimates that the annual cost of storing energy via this system will vary between $50 to $100 per megawatt hour (MWh),” the report adds. “And he says that the energy expended to transport materials to the upper sits will be offset by the amount of gravitational energy the system produces.”