Battery Storage — Fleet & Pipeline Analysis

Key Finding: The US battery storage fleet exhibits significant geographic concentration in Texas and California, which together account for over half of the national plant count and installed capacity.

State-Level Deployment Concentration

The deployment of battery storage plants across the US is heavily concentrated in a few key states, indicating regional market drivers or policy incentives.

• Texas (TX): 406 plants, 62.8 GW — Leading the nation in both plant count and capacity, highlighting its robust market for grid-scale storage.
• California (CA): 348 plants, 45.7 GW — Ranks second in both metrics, demonstrating strong policy support and high renewable penetration.
• Massachusetts (MA): 146 plants, 1.8 GW — Holds the third-highest plant count but a comparatively smaller total capacity, suggesting a prevalence of smaller-scale projects.
• Arizona (AZ): 76 plants, 22.4 GW — Ranks fourth in total capacity despite having fewer plants than Massachusetts, indicating larger average plant sizes.
• New York (NY): 65 plants, 1.5 GW — Reflects a growing but still developing market for battery storage, with moderate plant count and capacity.

Dominant Projects by Capacity

The national battery storage fleet is also characterized by several exceptionally large-scale projects, predominantly located in the Western US, signaling a trend towards utility-scale deployments.

1. Hop Hill Solar Generation and BESS (WA): 2,600 MW
2. Pepper Hammock Solar and Storage (GA): 2,500 MW
3. Sunstone Solar (OR): 2,400 MW
4. Deschutes Solar and BESS (OR): **

Recent news signals indicate robust development activity and significant project financing for battery storage, alongside emerging local regulatory challenges and environmental assessments.

Development Milestones & Funding

• Eolian commenced construction on a 1.06 GWh Ohio BESS, recognized as the largest battery energy storage project in the PJM region, with construction starting in late July 2026.

• Spearmint Energy secured nearly $450 million in project financing for a 600 MWh BESS project in July 2026, indicating continued investment in large-scale battery storage.

• Development news, totaling 178 articles, was the most frequent category among the 531 news signals, suggesting significant activity in project initiation and build-out.

Regulatory & Permitting Constraints

• Several signals indicate increasing regulatory scrutiny and potential local opposition: Green Mountain Power Corporation faced an environmental assessment notice in June 2026, and Johnstown considered a one-year battery moratorium in March 2026.

• Public hearings regarding battery storage bans or restrictions, such as in Virginia, were reported in February 2026, highlighting local community concerns.

• Regulatory news accounted for 63 articles, while Hazards & Incidents generated 9 articles, suggesting that while safety is a factor, broader regulatory frameworks and permitting challenges are more prominent.

The interconnection queue signals a massive expansion of standalone battery storage, with over 400 GW of proposed capacity, primarily driven by a few extremely large projects concentrated in specific states.

Battery Storage Dominates the Queue

• The interconnection queue for battery storage currently contains 2,072 projects, totaling 412.7 GW of proposed capacity, indicating substantial future growth potential.

• All projects in the queue are exclusively battery storage technology, reflecting a dedicated development focus.

• A large majority of these projects, specifically 1,947, are listed as active, with only 125 projects currently marked as suspended.

Significant Capacity in Top Projects

• The largest individual queue projects demonstrate a trend towards very high capacity installations, with five projects in Oregon each proposing 1,300 MW or more.

• Specifically, two projects in Oregon are each planned at 3,600 MW and 1,800 MW, respectively, highlighting the scale of some proposed developments.

• These top projects in Oregon alone account for a significant portion of the total proposed capacity, indicating a concentration of large-scale battery development in certain regions.