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.

Remembering the legacy of “those dam women”

LAS VEGAS – What we now know as Hoover Dam was one of the most impressive and recognizable feats of engineering of the 20th Century. It spans the Colorado River between Arizona and Nevada, about 30 miles southeast of Las Vegas and it creates one of the most important reservoirs for the southwest, Lake Mead.

Construction of the dam began in June, 1933, and was completed in May, 1935.

But some of the people who helped build the dam and its related city are not as well known: the women.

Dennis McBride is director of the Nevada State Museum in Las Vegas and has been researching the role of women in the massive construction project. He calls the project, which explores the legacy of how women helped make one of the largest infrastructure projects in American history possible, “Those Dam Women.”

“The stories of the women that were involved in various roles has been overlooked,” he told Nevada Public Radio on the show State of Nevada.

McBride said women may not have done actual construction work on the dam, but that is the only thing they didn’t do for the project and the town.

He said they created businesses, schools and sports organizations — everything a town with nothing in it would need.

“We can’t forget that one of the most important roles that women played were as wives and mothers,” he said, pointing out that “traditional” doesn’t mean insignificant or unimportant.

McBride said that women came out to an empty Southern Nevada and made homes out of tents, as well as shacks made of powder boxes and even the backs of cars, while their husbands worked on the dam.

“That can’t be underestimated — the importance and the effort that that took,” he said.

Construction of Boulder Dam. It was renamed Hoover Dam in 1947. (Photo courtesy of Nevada State Museum)

Boulder City was supposed to be built before construction on the dam started, but the stock market crash and the Great Depression meant workers started pouring into the area before the town was actually built.

McBride said workers pulled off the side of the road and set up tents, creating a community out of nothing.

The first female in the Boulder City townsite was Edith Powell, whose husband was working on the water tank at the top of the dam. The workers for that project set up tents before there was anything else there.

He said the people in charge of creating that community were primarily the women.

“The [phrase] that comes to mind is ‘it takes a village,'” he said. “It was the women that made Boulder City the village that was necessary to create lives and homes and futures for the people who chose to stay on there.”

While many women came out with their husbands who were looking for work, there were others who came out to start businesses of their own.

“But there were many women who came out to be entrepreneurs and business people,” McBride said. “So, there was a nice mix. It just depended on where you were when the Depression hit.”

If an unmarried woman who had to earn a living on her own came to Boulder City, McBride said she would find plenty of work to do.

The women who came here to set up a home and raise a family found a very tough life because nothing had been established.

One of the women who came out to Boulder City while the dam was being built was Ida Browder. McBride said she was a widow from Salt Lake City who set up the first commercial business on the Boulder City townsite: a lunch counter called Browder Lunch.

From there, Browder became a politically powerful woman — who was eventually dubbed the unofficial mayor of Boulder City.

Another political powerful woman from the time was Teddy Fenton. Fenton was essentially a mail-order bride from North Dakota. Fenton eventually ended up owning a lot of property and became extremely influential.

“People like [former Nevada governor] Mike O’Callaghan would come out, and they used to call it ‘to kiss Teddy’s ring’ to get her endorsement, because they knew if they got Teddy’s endorsement they had Boulder City,” McBride said.

There is a park named after Fenton, which is now at risk of disappearing, McBride said. Besides that park, he said, there is very little in the way of anything memorializing the women who helped build the community and keep the Boulder Dam project moving forward.