Getting Pumped: How LA Uses Two Big Lakes to Store Energy like a Giant Battery

LOS ANGELES – If L.A. is going to stop burning fossil fuels by 2045 — a key goal of Mayor Eric Garcetti’s proposed Green New Deal — it must store a lot more of the excess solar and wind energy it produces during the day so it doesn’t have to rely on gas and coal energy to power the city when the sun sets and the wind dies.

There’s a growing focus on building big batteries — for example, the kind that use lithium ions. But L.A. needs energy storage that is far bigger than any traditional battery.

And it’s found one.

The Los Angeles Department of Water and Power has turned two big lakes into a monster battery capable of storing enough energy to power tens of thousands of homes.

It involves using the excess wind and solar power L.A.’s renewable energy sites produce during the day to pump water from Castaic Lake uphill 7.5 miles to Pyramid Lake. Then, late in the day, when the sun goes down and the city’s energy demand spikes, the water gets run downhill through hydroelectric generators at Castaic Lake.

The next day, the cycle starts over again. The same 10,000 acre-feet of water can recirculate over and over, getting pumped uphill during the day and coming downhill at night to power the city.

It’s called pumped storage, and the plant at Castaic is one of the largest such plants in the western United States, but maybe not for long.

LADWP is looking at building an even larger plant at Hoover Dam, so this form of energy storage, if replicated, could be a key to L.A. weaning itself off of fossil fuels.

So Let’s Tour the Castaic Pumped Storage Plant

It’s hidden away — kind of like a superhero’s secret lair — behind locked gates at the end of a winding mountain ridge road off I-5.

Castaic Pumped Storage Plant as seen from a mountain ridge near Ridge Route Road. (Photo by Sharon McNary/KPCC/LAist)

Once you’re inside the gates, the first thing you notice are six gargantuan pipes that flow water from Pyramid Lake 7.5 miles down to Castaic Lake. Water is pumped back uphill in the same 30-foot-diameter pipes.

The pressure is 25 times the force of the water coming out of your home faucet.

Here’s another look at those massive pipes from a different perspective, way up on the mountain looking down at Castaic Lake.

These massive pipes, called penstocks, move water up and down between Castaic and Pyramid Lakes. This is a view looking downhill at Castaic Lake. The Elderberry Forebay at the base of the pipes is part of Castaic Lake. It holds up to 10,000 acre-feet of water that can be recirculated between the two lakes. (Photo by Andrew Cullen for LAist)

Time to head down into the guts of the plant. We step off the elevator to a balcony overlooking a giant windowless chamber four stories tall.

The six turbines are in a vast windowless chamber. The pressure of the water coming downhill in the giant pipes spins the hydroelectric turbines, generating power for Los Angeles. More than 50 LADWP employees keep the plant running.

Below you can see two of the six turbine units. Unit 3 on the left, is covered and is ready to produce electricity as water spins the turbines inside it. Unit 4, on the right, is open for maintenance.

Unit 3, left, produces electricity while Unit 4 sits open for maintenance at Castaic Hydroelectric Power Plant in Castaic, Calif. (Photo by Andrew Cullen for LAist)

The six turbine units look like giant spools sunk into the floor. They put out enough energy, when they are all spinning, to power 83,000 homes over the course of a day. Their output is huge in comparison to LADWP’s largest chemical battery, which is a 20 megawatt lithium ion battery, which can power about 600 homes over a day.

Here is a view of the turbine in Unit 5. It’s been lifted partially above the floor of the turbine room. Each turbine weighs 550 tons. To lift them up takes two cranes that move the length of the room.

Castaic Hydroelectric Power Plant has six reversible 250,000 kilowatt turbines. The plant provides power for Los Angeles during peak use periods. (Photo by Andrew Cullen for LAist)

It takes a lot of pipes and plumbing to control the flow of water in this pumped storage plant. We descend several flights of stairs to get to the bottom of the plant to see the pumps.

At the very bottom of the plant, we’re 90 feet under the water level of the lake.

Massive machinery controls the flow of water through the hydroeletric plant at Castaic Hydroelectric Power Plant in Castaic, Calif. (Photo by Andrew Cullen for LAist)

The pumps are what makes this plant different from an ordinary hydroelectric plant. There are six giant pumps — each with a shiny silver piston arm. They are pushing water back up the mountain to Pyramid Lake in the same 30-foot-diameter pipes that brought it down to Castaic Lake.

Recirculating the water like this takes a lot of energy — but that’s okay. DWP has more wind and solar energy during the day than it can use. So rather than disconnect the solar panels and windmills, or sell the energy cheaply to someone else, DWP uses the extra energy to move the water uphill to Pyramid Lake.

Once the water is waiting uphill at Pyramid Lake, it’s stored energy, ready to flow back downhill to generate energy when L.A. needs it, late in the day.

A pump pulls water from 90 feet under Lake Castaic into the Castaic Hydroelectric Power Plant in Castaic, Calif., and sends it uphill to Pyramid Lake. (Photo by Andrew Cullen for LAist)

This battery-like combination — pumps and turbines — can be built very big. And they use the most reliable force on Earth — gravity.

Elderberry Forebay is a section of Castaic Lake that holds the water that gets recirculated between Pyramid Lake and Castaic to produce electricity.

Runoff from Castaic Hydroelectric Power Plant enters Elderberry Lake, which holds water that can be pumped back up to Pyramid Lake and reused to produce electricity. (Photo by Andrew Cullen for LAist)

Assistant general manager Reiko Kerr says they could pump water from Lake Mohave 20-some miles upstream to Lake Mead to run through Hoover Dam’s giant hydroelectric turbines.

“You already have the dam, you have the generators, you have the transmission lines — you basically need a set of pumps and pipelines,” Kerr said.

The eventual size depends on the number of other agencies that might invest in the project.

“That upper reservoir is huge — Lake Mead — so you could store power in the form of water up there for potentially months, and seasonally,” she said.

The Hoover Dam pumped storage project could come online by 2030, adding to the energy storage L.A. needs to get to 100% renewable energy.

Storing Sunlight: Arizona’s Largest Utility Plans to Expand Battery Capacity

PHOENIX – Arizona Public Service Co. plans to add hundreds of megawatts of battery storage by 2025 to its solar power plants so customers can keep using solar energy when the sun sets.

Arizona’s largest utility announced last week that a new plan to add 850 megawatts of battery storage and at least 100 megawatts of new solar generation by 2025.

It’s one of the largest battery storage initiatives in the country, which is why U.S. Energy Secretary Rick Perry on Friday toured one of APS’s renewable energy facilities an hour’s drive west of Phoenix.

“The holy grail in this whole renewable energy quest is in energy storage,” Perry said in a downpour after the tour.

Perry said Arizona is on the forefront of a national effort in clean energy storage.

“Today (Friday) is a great example of an all-of-the-above energy policy which this country is striving towards,” he said.

Scott Bordenkircher directs technology and innovation at APS. He said battery storage will be developed over the next six years to store solar energy. “To put that in perspective, that’s the equivalent of about 3 million solar panels or 10,000 electric vehicles.” (Photo by Peter Gong/Cronkite News)

APS Chairman and CEO Don Brandt said on the company’s website that Arizona is a national leader in solar energy.

“The challenge is, no one has figured out how to stop the sun from setting at night,” Brandt said. “As storage technology improves and declines in cost, we will increasingly be able to store the power of the sun cost-effectively to deliver when our customers need it.”

Arizona is known for more than 300 sunny days a year, and power companies have tapped into this renewable source. The state ranks second to California, according to the U.S. Energy Information Administration, for generating solar energy, but it’s hard to store that power when the sun sets, a time when people often need power the most.

Scott Bordenkircher, director of technology and innovation at APS, said the storage will be developed over the next six years. “To put that in perspective, that’s the equivalent of about 3 million solar panels or 10,000 electric vehicles.”

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Bordenkircher said the company’s announcement means Arizona will be second only to California in terms of the size of batteries being used.

“Not all of their (California’s) batteries are meant to be coupled with renewable energy sources,” he said. “This is truly targeted at unlocking that renewable energy mix, that clean energy mix that we have in Arizona.”

The batteries are stored in a facility, and stacked on top of each other like building blocks. The storage system gets power from the sun during the day. Then, the energy from the solar panels gets transferred to the batteries. When the sun goes down, battery power activates allowing customers to use solar energy at night.

Patrick Graham, state director of the Nature Conservancy in Arizona, called the initiative an important step in protecting the environment.

“This really is the pathway to moving towards clean energy,” Graham said. “It’s short-term storage, so it’s not going to last for long periods of time. But it’s critical in helping balance out the reliance on renewable energy.”

Barbara Lockwood, vice president of regulations at APS, said bringing hundreds of batteries online will be an investment, but it won’t cost customers more than they already pay for electricity.

“It certainly costs money, but the great news is that energy storage costs have declined to the point where it’s competitive with sources of generation,” Lockwood said.

Arizona is second only to Nevada in solar energy potential, according to the U.S. Energy Information Administration. But in 2016, solar accounted for only about 5 percent of Arizona’s net electricity generation.

APS plans to install six battery systems at existing solar plants in Maricopa County and Yuma by 2020. And more storage and solar power will come online by 2025.

– Video by Lillian Donahue/Cronkite News

Renewable energy state by state

PHOENIX – Environment America released a report on Tuesday that focuses on how well the nation is utilizing renewable energy. Several states in the west top the lists, including California, and Arizona.

Arizona has dramatically increased renewable energy production since 2008, the report said, and ranks high in several categories. California leads the way in solar power and battery storage.