The Energy Storage Report 2024

Now available to download, covering deployments, technology, policy and finance in the energy storage market

Texas BESS reliability issue is ‘not over’ for ERCOT despite NPRR 1186 state-of-charge rule rebuff


The issue of ensuring reliability of BESS resources in the Texas electricity market has not gone away for grid operator ERCOT, despite the state regulator’s recent quashing of proposed minimum state-of-charge (SOC) rules.

As reported by in January this year, the Public Utility Commission of Texas (PUCT) ordered ERCOT to rescind NPRR (Nodal Protocol Revision Request) 1186, a rule which forced battery energy storage system (BESS) resources to hold additional capacity when providing ancillary services.

This article requires Premium SubscriptionBasic (FREE) Subscription

Enjoy 12 months of exclusive analysis

  • Regular insight and analysis of the industry’s biggest developments
  • In-depth interviews with the industry’s leading figures
  • Annual digital subscription to the PV Tech Power journal
  • Discounts on Solar Media’s portfolio of events, in-person and virtual

Or continue reading this article for free

ERCOT’s reasoning was to ensure that BESS resources could fulfil their ancillary service duties, with some units occasionally failing to provide the power they were contracted to provide. The state’s main ancillary services are ERCOT Contingency Reserve Service (ECRS), Reg-Up and Reg-Down and Responsive Reserve Service (RRS), which form the vast majority of revenues for BESS in Texas today.

Issue is ‘not dead’ for ERCOT

Speaking to at our publisher Solar Media’s Energy Storage Summit USA 2024 in the capital Austin last week, optimiser Gridmatic’s VP business development David Miller explained that the issue is not over.

“There is a perception that yes, it’s done and dusted, but we would say ‘not exactly’,” Miller said.

“ERCOT feels like some of the batteries are not operated with the level of reliability that they want. They’re worried that, moving forward, batteries are going to be providing all ancillary services, so in their mind it being a less reliable resource is a problem. NPRR 1186 is dead, but the issue is not.”

ERCOT can and will continue to penalise BESS – and any type of resource for that matter – with financial penalties for not providing an ancillary service when contracted to (‘failure to provide’). However, the penalties are not very high and BESS resources are better off having ‘failure to provide’ penalities from time to time. This is not what ERCOT wants, Miller said.

Adding: “We expect to see some kind of new solution. I’m not sure exactly what, it could be changing the way penalties work for ‘failure to provide’ or non-financial penalties like kicking out a poorly performing BESS out of the ancillary service market altogether. It’s not totally clear, but they have to be thinking about what tools they have to get there.”

The PUCT shot down NPRR 1186 because it was discriminatory against BESS, with no other type of resource forced to maintain minimum supplies of energy.

Thermal power plants are the other main type of ancillary service provider, and the only company that publicly argued for NPRR 1186 was oil and gas major Shell (where incidentally, Miller worked prior to spending five years at Greensmith Energy, the US energy storage pioneer which was acquired by Wartsila in 2017, before Miller then joined Gridmatic).

Miller added that the risk of a ‘failure to provide’ penalty is a big part of Gridmatic’s modelling when managing both its own and other client’s BESS units in the market.

The ERCOT, Texas market is the leading US one for BESS deployments along with California. California was set to reach around 8.5GW of BESS by end-2023 according to the California Energy Commission (CEC, the equivalent to Texas’ PUC) while ERCOT expects to have 9.5GW of BESS online by October 2024.

22 May 2024
London, UK
At the time of writing, Europe had had its most successful year in terms of Power Purchase Agreements (PPAs) with a record 7.8GW of renewable energy contracts signed. As we gather in May 2024 for the third edition of the Renewable Energy Revenues Summit, the energy landscape continues to evolve rapidly, influenced by the beating drum of climate change, volatility around power prices and the need to decarbonise power procurement as well as generation.
22 October 2024
New York, USA
Returning for its 11th edition, Solar and Storage Finance USA Summit remains the annual event where decision-makers at the forefront of solar and storage projects across the United States and capital converge. Featuring the most active solar and storage transactors, join us for a packed two-days of deal-making, learning and networking.

Read Next

April 23, 2024
The energy storage arm of Canadian Solar said the technology ‘has more complexity than solar’ when it comes to nearshoring manufacturing away from China, and local cell manufacturing could be part of the long-term strategy to leverage domestic content incentives.
April 23, 2024 Premium speaks with Michael Phelan, CEO of energy management solutions provider GridBeyond, following €52 million Series C funding round.
April 18, 2024
The CFO of Goldman Sachs-backed US battery storage developer-operator GridStor discussed its recent investment tax credit (ITC) transfer deal for a California BESS project, highlighting some downsides as well as positives from the new mechanism.
April 18, 2024
Clearway Energy has put two large solar and storage projects into operation in California, it announced on the same day as an industry letter asking Congress to reform siting, permitting and transmission before this year’s elections.
April 18, 2024
Rapid technology improvements and trade policy risk pose a dilemma for US battery storage procurement decision-makers, write George Touloupas and Jeff Zwijack of consultancy and market intelligence firm Clean Energy Associates (CEA).

Most Popular

Email Newsletter