As the sun sets on California’s solar farms, a backup energy source deep in the Sierra Nevada Mountains springs to life.
The huge system of reservoirs and turbines can store energy during the day and then crank out electricity for 900,000 homes, using just water and gravity.
As the state tries to make wind and solar work around the clock, officials want to build more like it. It is not likely to not be easy: Such projects take years to develop, are expensive and face stiff opposition.
The push by California and other states to revive the century-old technology — called “pumped-hydro storage” — underscores the limitations of modern batteries. While utilities are aggressively installing lithium-ion systems on California’s grid, facilities such as the aging one in the Sierras can deliver far more electricity than anything made by Tesla Inc.
“It’s not as glamorous as a battery, but it’s a tried and true technology that provides the volume that we need,” said Neena Kuzmich, project manager for a proposed pumped-storage facility near San Diego.
California’s goal to get 100 percent of its electricity from carbon-free sources by 2045 requires an unprecedented amount of energy storage.
Lithium-ion battery installations produce a few hundred megawatts of electricity at most. The 35-year-old plant in the Sierras — PG&E Corp’s Helms Pumped Storage facility — can deliver more than 1,200 megawatts at a clip.
The Swiss pioneered pumped-storage technology in the late 1800s, but it did not take off in the US until the 1960s and 1970s, when dozens of plants were built to store surplus energy from nuclear reactors and other big plants. There are seven in California alone.
Renewed interest is surging. The US Federal Energy Regulatory Commission has issued 34 preliminary permits for companies and government agencies exploring projects in New York, Pennsylvania, Wyoming and elsewhere. Another 16 applications are pending. Nine are proposed in California.
The idea is simple. Take two reservoirs at different elevations, connected by pipes or tunnels. When electricity is abundant, pump water from the lower reservoir to the one uphill. When the grid needs power, let the water flow back down through turbines.
While the concept is straightforward, execution is not. The projects can cost more than US$1 billion to build. They are cheap once up and running, but the huge upfront price makes them more expensive overall than utility-scale batteries, according to BloombergNEF.
Plus, securing permits, building dams and boring tunnels can take 10 years, and since the process often involves flooding valleys, most projects face resistance.
That is particularly true in California. Environmentalists there have scrutinized pumped storage projects not just for their effect on the wilderness — but for using too much water, too.
The furthest along of the projects proposed in the state would be next to Joshua Tree National Park, using abandoned mining pits for reservoirs. It has met fierce opposition.
“It would be drawing extraordinary amounts of water from an aquifer that feeds essentially everything in the park,” said Kathryn Phillips, Sierra Club director for California.
A spokesman for NextEra Energy Inc, which bought a majority interest in the project last year, said environmental impacts were thoroughly vetted before federal regulators approved it in 2014. Construction has yet to begin.
Other projects would incorporate existing reservoirs.
The Los Angeles Department of Water and Power has proposed converting the Hoover Dam into a giant pumped-storage facility, and the San Diego County Water Authority wants to build a reservoir uphill from an existing one to create a storage system.
Start-up Oceanus Power & Water, meanwhile, has applied for federal permits to study two spots on the coast for systems to store energy and desalinate seawater. They would pump ocean water up to a reservoir. The water would then flow back down, with some diverted into a system to remove the salt. The rest would power turbines.
“Anywhere there’s a large coastal population in a semi-arid part of the world, our solution can work,” Oceanus chief executive officer Neal Aronson said.
BUSINESS UPDATE: The iPhone assembler said operations outlook is expected to show quarter-on-quarter and year-on-year growth for the second quarter Hon Hai Precision Industry Co (鴻海精密) yesterday reported strong growth in sales last month, potentially raising expectations for iPhone sales while artificial intelligence (AI)-related business booms. The company, which assembles the majority of Apple Inc’s smartphones, reported a 19.03 percent rise in monthly sales to NT$510.9 billion (US$15.78 billion), from NT$429.22 billion in the same period last year. On a monthly basis, sales rose 14.16 percent, it said. The company in a statement said that last month’s revenue was a record-breaking April performance. Hon Hai, known also as Foxconn Technology Group (富士康科技集團), assembles most iPhones, but the company is diversifying its business to
Apple Inc has been developing a homegrown chip to run artificial intelligence (AI) tools in data centers, although it is unclear if the semiconductor would ever be deployed, the Wall Street Journal reported on Monday. The effort would build on Apple’s previous efforts to make in-house chips, which run in its iPhones, Macs and other devices, according to the Journal, which cited unidentified people familiar with the matter. The server project is code-named ACDC (Apple Chips in Data Center) within the company, aiming to utilize Apple’s expertise in chip design for the company’s server infrastructure, the newspaper said. While this initiative has been
GlobalWafers Co (環球晶圓), the world’s No. 3 silicon wafer supplier, yesterday said that revenue would rise moderately in the second half of this year, driven primarily by robust demand for advanced wafers used in high-bandwidth memory (HBM) chips, a key component of artificial intelligence (AI) technology. “The first quarter is the lowest point of this cycle. The second half will be better than the first for the whole semiconductor industry and for GlobalWafers,” chairwoman Doris Hsu (徐秀蘭) said during an online investors’ conference. “HBM would definitely be the key growth driver in the second half,” Hsu said. “That is our big hope
The consumer price index (CPI) last month eased to 1.95 percent, below the central bank’s 2 percent target, as food and entertainment cost increases decelerated, helped by stable egg prices, the Directorate-General of Budget, Accounting and Statistics (DGBAS) said yesterday. The slowdown bucked predictions by policymakers and academics that inflationary pressures would build up following double-digit electricity rate hikes on April 1. “The latest CPI data came after the cost of eating out and rent grew moderately amid mixed international raw material prices,” DGBAS official Tsao Chih-hung (曹志弘) told a news conference in Taipei. The central bank in March raised interest rates by