Sign In or Create an Account.

By continuing, you agree to the Terms of Service and acknowledge our Privacy Policy

Climate

A Big Week for Batteries

Texas and California offered intriguing, opposing examples of what batteries can do for the grid.

•
A battery.
Heatmap Illustration/Getty Images

While cold winters in the south and hot summers across the country are the most dramatic times for electricity usage — with air conditioners blasting as weary workers return home or inefficient electric heaters strain to keep toes warm from Chattanooga to El Paso before the sun is up — it may be early spring that gives us the most insight into the lower-emitting grid of the future.

In California, America’s longtime leader in clean energy deployment, the combination of mild temperatures and longer days means that solar power can do most of the heavy lifting. And in Texas — whose uniquely isolated, market-based and permissive grid is fast becoming the source of much of the country’s clean power growth — regulators allow the state’s vast fleet of natural gas power (and some coal) power plants to shut down for maintenance during the mild weather, giving renewables time to shine.

And not just renewables: Both Texas and California saw remarkable usage of batteries on the grid this week. If the whole country’s grid is ever going to be decarbonized, other grids will have to start looking at what's happening in America’s two largest states.

At 7:30 p.m. Central Time on Tuesday, with 20,000 megawatts of power unavailable due to planned outages of thermal power plants, batteries were providing 1.7 gigawatts of power to the Texas grid, slightly more than solar, while wind was providing 5.5 gigawatts. Four hours earlier, solar and wind combined for almost 25 gigawatts. Real-time prices Tuesday evening topped out at over $4,000 per megawatt hour, getting close to the $5,000 cap imposed after blackouts and price spikes of Winter Storm Uri in 2021.

“There was a substantial amount of physical capacity available still,” Connor Waldoch, co-founder of the electricity monitoring company Grid Status, told me, referring to generation that was capable of selling power to the grid but was being kept off in case of an emergency. “ERCOT,” the organization that governs the Texas grid, “has been operating conservatively for the last few years,” he said. Temperatures were also high late in the day, with temperatures in the 80s in the evening parts of Texas, leading ERCOT to ask some plants to delay their scheduled maintenance.

According to Grid Status, there was more battery storage on the Texas grid Tuesday than at any point since high temperatures tested its stability last September. That combined with high prices in the real-time energy market meant a huge payday for battery storage operators. When there are more planned outages for natural gas, Waldoch explained, batteries are bidding “at the very tippity top” and likely earning huge revenues in just a few a hours.

But all those batteries are not necessarily helping decarbonize Texas’ electricity system by charging when there’s a lot of cheap solar and discharging when renewables are scarce and prices are high.

That’s because battery systems in Texas make the lion’s share of their revenues by providing what’s known in Texas as “ancillary services.” ERCOT pays battery operators to be available if the grid needs power quickly — and then they get paid again for the power they provide when called upon.

The spike in prices and battery operators' response be a sign that the battery market is maturing. In 2023, according to the battery storage data service Modo Energy, Texas battery operators earned around 85% of their revenue from providing ancillary services. For battery developers, earning money this way is ideal because it means less wear and tear on battery systems as they charge and discharge.

That said, the portion of revenue that battery systems earn from selling actual energy almost tripled from 2022 to 2023; Brandt Vermillion, Modo’s ERCOT lead, estimated that installed battery capacity would double in ERCOT in 2024, while the amount of ancillary services would stay “more or less fixed.” As the supply of battery capacity gets closer to and possibly exceeds demand for ancillary services, those prices will fall, Vermillion said. Over time, “energy arbitrage” — charging when prices are low and discharging when prices are high — will become a more and more attractive way to earn revenue.

To get a sense of what that will look like, Texas battery storage operators should look west.

In California this week, conditions were more, well, pacific. At 8 p.m. Pacific Time on Tuesday night, there were around 6 gigawatts of battery storage discharging onto the grid, more than the 5 gigawatts of natural gas or the 4.5 gigawatts of hydro power at the time. Batteries were the largest source of power on the grid.

This was a signal moment for California, which has been procuring and deploying grid batteries at a breakneck pace, and even retooled its residential solar program to encourage home battery storage. California’s grid has over 7 gigawatts of installed battery storage, according to the Energy Information Administration, the most of any state, while Texas, in second place, has just over 3 gigawatts. (There are another 300 utility-scale battery projects in the pipeline for 2024, according to the EIA, with about half of them planned for Texas.)

In California, the so-called “saturation” of ancillary services by batteries is far more advanced, and the portion of revenues earned by battery systems by providing them has decreased.

“Ancillary services have gone from taking up the majority of battery capacity to only a small fraction,” according to a report by the California Independent System Operator. By the end of 2022, the majority of battery revenue came from the energy markets, not ancillary services, the report said.

Thanks to the magnitude of solar in California, Grid Status’ Waldoch explained, “almost every day there’s a long negative- or low-price period” — an ideal time for carbon-abating energy arbitrage.

Batteries that are most carbon-abating tend to power themselves when transmission is congested, which essentially “strands” renewables on the grid, or when they would otherwise be curtailed, when there’s too much renewable power available compared to demand, explained Emma Konet, co-founder of Tierra Climate, which is working to set up a voluntary carbon market to encourage carbon-abating battery usage. When the company examined Texas’ battery market in 2022, it found that only about a fifth of batteries were actually abating carbon.

In fact, the most carbon-intensive battery system in Texas that Tierra Climate looked at was also its most profitable, making the lion’s share of its revenue in the ancillary services markets; the most carbon-abating didn’t participate in the ancillary services markets at all, and was paired directly with a solar project.

Texas's energy market is simply not structured in a way such that there's a good correlation between low prices and low emissions for charging and high prices and high emissions when batteries discharge, Konet told me. (The best way to align batteries with lower emissions, she added, would be a carbon tax of at least $50 a ton.) While Tierra Climate hasn’t looked in detail at California, Konet said California’s battery systems are more likely to be carbon-abating because of the prevalence of storage projects paired with renewable generation.

There’s probably no worse way to encourage Texas to do something than by pointing to California as a positive example. Still, if Texas’ battery storage industry is ever going to turn into something more than an adjuster pedal for its existing grid mix, it’s going to have to get a little more Left Coast — or at least move a little closer to those solar panels.

You’re out of free articles.

Subscribe to access Heatmap's exclusive climate and energy polling, award-winning journalism, and subscriber-only events. Save $57 on an annual subscription, just $156 $99/year.
To continue reading
Create a free account or sign in to unlock more free articles.
or
Please enter an email address
By continuing, you agree to the Terms of Service and acknowledge our Privacy Policy
Energy

The Last-Minute Changes to the Senate Permitting Deal, Explained

A new version of the bill strives to address environmental and tribal concerns while strengthening some of its transmission provisions.

Power lines and data center construction.
Heatmap Illustration/Getty Images

We now have the updated final text of the bipartisan Senate permitting deal. Will it be enough to get the bill across the finish line?

On Saturday morning, senators released a reworked version of the Bipartisan Affordability and American Jobs Act. This version, known as a “manager’s amendment” under parliamentary procedure, aims to address many of the concerns and criticisms raised about the bill and will become the official legislative text that ultimately gets a vote in the Senate. There’s something in these changes for everyone – environmentalists, tribes, utilities – but it remains to be seen if they put the bill into a Goldilocks zone.

Keep reading...Show less
Climate

What to Know About COP31

The “35x35” electrification pledge and an AI pledge are on the table.

Antalya, Turkey.
Heatmap Illustration/Getty Images

World leaders are flocking to the Mediterranean resort town of Antalya, Turkey, this weekend for the 31st United Nations Climate Change Conference, also known as COP31. The U.S., of course, will once again not attend, as President Trump not only withdrew the country from the Paris Agreement but also from the United Nations Framework Convention on Climate Change, the umbrella group that organizes the annual conferences. Still, 194 other governments will be there, putting their heads together on how to move another few inches toward a safer future.

This year, as with the last several convenings, the meeting arrives against a backdrop of geopolitical instability, worsening climate impacts, and growing concern about energy security and affordability. While conflicts like the Iran war in some ways bolster the case for the energy transition by surfacing the risks of fossil fuel dependence, prioritizing energy security can manifest as countries turning inward and showing less willingness to work for the global good.

Keep reading...Show less
Green
Politics

California Just Voted for Single-Payer Wildfire Insurance

Progressive candidate Jane Kim declared victory in the race for California Insurance Commissioner.

Jane Kim and Ben Allen.
Heatmap Illustration/Getty Images, Jane Kim, Ben Allen

Few political wonks outside of California were likely paying much attention to the Golden State on Tuesday night, as Democrats’ anticipated blue wave crested. But the state did have one close, consequential race on the ballot: insurance commissioner. On Friday, Bernie Sanders-endorsed progressive Jane Kim won the race to lead the California Department of Insurance, which oversees the state’s $452 billion insurance market.

Kim declared victory over the more moderate State Senator Ben Allen, who was backed by the California Democratic Party, after reaching a nearly six-point lead on Friday. In a brief speech before supporters, Kim said Allen called to congratulate her that morning. (A spokesman for the Allen campaign confirmed the call to The Orange County Register.) Kim ran on a proposal for a state-run, single-payer insurance program that would cover homeowners against wildfire damage — though the plan would ultimately need approval from both the California legislature and Governor-elect Xavier Becerra.

Keep reading...Show less
Yellow