The United States Enters a New Era of Energy Storage

The American battery energy storage market is accelerating at an unprecedented pace in 2025, according to a recent Solarplaza study that examines the country’s 25 largest operational Battery Energy Storage Systems (BESS). These figures not only highlight the scale of the investment wave but also underline the speed at which energy systems are transforming.

The combined capacity of the top 25 projects now reaches 9,441 MW of power and 34,190 MWh of storage, marking a 13% increase in capacity and a 19% increase in storage volume compared to 2024. The total installed BESS capacity in the U.S. as of spring 2025 stands at 30 GW, with 18.2 GW of new installations expected within the year.

The Rise of Hybrid Solar + Storage Systems

A notable trend in the U.S. market is the dominance of hybrid configurations. Around two-thirds of the systems in the study combine battery storage with solar PV, rather than functioning as standalone battery parks. This demonstrates how integrated renewable energy and storage solutions are becoming fundamental pillars of modern electricity networks, improving both efficiency and grid stability.

California leads the nation with 13 of the top 25 projects, confirming its position as the epicentre of the solar + storage sector. Arizona and Nevada are catching up quickly, while Texas remains a major player with a strong presence of standalone storage facilities.

Landmark Projects Reshaping the Market

Among the most significant projects is the Edwards & Sanborn facility in California, which boasts 971 MW / 3,287 MWh of solar-plus-storage capacity. Another key development is the Moss Landing project, also in California, with 750 MW / 3,000 MWh of standalone storage. The Desert Peak installation, with 700 MW / 2,800 MWh, is another major player in the state’s grid infrastructure.

Market leaders such as NextEra Energy, Vistra Energy, Terra-Gen, Longroad Energy, and Calpine are at the forefront of ownership and operation, shaping the competitive landscape for large-scale storage.

Economics and Competitiveness

The levelised cost of energy for storage systems now ranges between $50 and $131 per MWh, making them already competitive against traditional gas- or coal-fired peaker plants. Moreover, the construction times for battery storage projects are significantly shorter than those for conventional generation facilities, further enhancing their attractiveness for rapid deployment.

Lessons for the Hungarian Market

The Solarplaza study makes one thing clear: energy storage is no longer a future option — it is the new standard for modern energy systems. In Hungary, industry associations such as the Hungarian Solar and Collector Association argue that national development policy should prioritise both industrial and residential energy storage. They also recommend making hybrid solar-plus-storage designs a regulatory priority during permitting processes, noting that long-term grid flexibility and energy security can only be ensured with storage solutions in place.

At Solar&Solar Wholesale, we closely follow global trends to help our partners — from installers to large enterprises — integrate cutting-edge solar and storage solutions into their projects. The developments in the U.S. are a clear signal: combining renewable generation with robust storage capacity is the pathway to a resilient, efficient, and sustainable energy future.