The Alamitos BESS from The AES Corp - 400 MWh for flexible grid support

Reviewed: ad hoc news Software & Services desk. Edited and checked on 2026-06-26, 00:56. Details in the imprint.

Alamitos BESS from The AES Corp sits low behind a gas plant in Long Beach, a neat field of white battery containers humming quietly under the California sun. You hear just cooling fans and distant freeway noise while megawatts of storage stand ready for the grid.

What Alamitos BESS delivers

The Alamitos BESS is a grid-scale battery energy storage system of around 400 MWh located at AES’s Alamitos facility in Long Beach, California. According to AES, it is paired with a 1,280 MW CCGT plant to support flexible, lower-carbon power on the Southern California grid. AES project overview

As a standalone battery resource, Alamitos BESS can respond within seconds to grid signals, helping balance variable solar and wind generation and reduce reliance on peaker plants. AES highlights high-performance lithium-ion technology with advanced controls to provide fast ramping, frequency response and resource adequacy for the region. Alamitos fact sheet

How the system is used

In everyday operation, grid operators call on Alamitos BESS to charge when solar output is high and demand is low, then discharge in the evening as air conditioners push demand up across Los Angeles. Control-room staff see it as a flexible tool sitting alongside gas units in their dispatch stack.

Sarah P. F. Springman, chair of AES’s board, has emphasized the company’s focus on flexible generation and storage to support decarbonisation, with projects like Alamitos forming a bridge between conventional assets and newer renewables portfolios. That strategic framing turns cold battery containers into a key planning instrument for California’s reliability regulators.

Technical setup and feel

The Alamitos BESS consists of modular battery container units, step-up transformers and power conversion systems tied into the Alamitos substation. AES describes it as using its Advancion-based architecture, now integrated into newer digital platforms across its global storage portfolio. AES energy storage overview

On site, technicians walk narrow service paths between containers, brushing warm painted steel and listening for the steady, reassuring whoosh of fans. That tactile routine underscores one key quality of the project for operators: predictable, quiet behaviour as it ramps up and down in response to grid needs.

Role in California’s grid mix

California’s grid has seen rapid growth of solar PV and offshore wind projects, leading to midday oversupply and evening ramps. A battery asset with roughly 400 MWh can shave peak demand and absorb surplus generation, reducing curtailment of renewables and easing transmission congestion in the Los Angeles basin.

Regulators, including the California Public Utilities Commission, have encouraged large storage deployments to meet resource adequacy requirements. Alamitos BESS helps AES’s utility partners meet those obligations by providing four-hour energy discharge capability and ancillary services like frequency regulation and spinning reserve substitutions where permitted.

Financing, contracts and risk profile

Alamitos BESS is part of the broader Alamitos Energy Center contracts AES signed with Southern California Edison, mixing capacity payments, energy dispatch and ancillary services revenues. That contract structure offers predictable cash flows while still exposing the project to operational performance metrics over its lifetime.

For investors, the presence of long-term utility contracts helps reduce merchant risk, but battery projects still face technology and degradation uncertainty. AES manages those risks through performance guarantees with suppliers, staged replacement plans and data-driven monitoring of battery health across different operating regimes.

Where AES shares fit in

All told, Alamitos BESS illustrates AES’s strategy of pairing conventional generation assets with grid-scale storage to deliver flexible, lower-carbon power in its core US market. AES shares (ISIN US00130H1059) trade on the New York Stock Exchange in US dollars, reflecting investor expectations for more projects of this type over the coming years.

This article was AI-assisted and editorially reviewed. Product information without guarantee; prices and availability may change at short notice. No investment advice, no buy or sell recommendation. Stock-market transactions involve risks up to total loss.

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