Utility-scale solar and batteries dominated U.S. plants that actually came online in first half of 2026

The clearest signal in the U.S. generation build this year isn’t coming from press releases about future gas plants. It’s sitting in the list of what actually got turned on.

From January through June 2026, 368 utility-scale power plants began operating in the United States, and the list is dominated by utility-scale solar and battery storage, according to Inside Climate News’ analysis of U.S. Energy Information Administration (EIA) data.

For grid operators, large-load developers, and energy procurement teams, that mix changes the day-to-day problem: less “do we have enough nameplate capacity” and more “can we shape when power shows up, and under what dispatch rules.”

What the 368-plant list says about real-world build mix in 2026

Inside Climate News pointed to EIA data showing utility-scale solar led new projects by count, with 207 solar plants coming online in the first half of 2026. Batteries were next with 95 projects. After that, the list thins quickly into gas peakers and small thermal builds: 22 natural gas combustion turbines and 21 natural gas internal combustion engines, with only 9 onshore wind projects and 3 combined-cycle gas projects in that six-month window, according to Inside Climate News’ read of the EIA dataset.

Capacity tells a similar story. Inside Climate News reported that utility-scale solar added 11,458 MW of capacity from January through June 2026, while batteries added 8,207 MW. Onshore wind showed 5,473 MW, largely because the SunZia projects are so large. The three largest types of new natural gas plants together added 2,707 MW, according to Inside Climate News.

This is where operators should be careful with a common shortcut. A megawatt of solar, a megawatt of battery, and a megawatt of gas turbine capacity do different jobs on a stressed grid. Inside Climate News explicitly flagged the caveat: solar doesn’t produce at night, and many gas plants run only during short peak windows.

Marquee projects are real, but they can mislead procurement assumptions

The top of the list is “top-heavy,” Inside Climate News wrote, led by the SunZia Wind South and SunZia Wind North projects in New Mexico. Together they total 3,650 MW and are described by Inside Climate News as the largest wind farms in the country to begin generating this spring.

But Inside Climate News also framed SunZia as an echo of an earlier onshore wind development cycle. SunZia has been in the works for about a decade, arriving as U.S. onshore wind development has slowed for a mix of reasons, including regulatory and public-opinion dynamics, according to the outlet.

A similar “long lead time” dynamic shows up again with offshore wind. Inside Climate News listed Vineyard Wind near Massachusetts as the fourth-largest new plant and described its completion as a long-awaited milestone that also does not necessarily indicate what’s next in the pipeline.

Meanwhile, one of the largest builds that does align with the long-tail pattern is a hybrid solar and storage project. Inside Climate News highlighted the Green River Energy Center in Utah at 800 MW, split as 400 MW of solar and 400 MW of batteries.

The battery accounting problem that shows up in operations immediately

A storage-heavy buildout forces an uncomfortable question: what, exactly, counts as “new capacity” when an asset’s main purpose is shifting energy instead of producing it?

That tension was visible in Ars Technica’s community discussion of the same EIA-based story. One user complained that it’s frustrating to see batteries treated as generation. Another argued the opposite framing can be operationally useful because storage can reduce curtailment and defer other builds by making solar output available when demand is higher, according to posts in the Ars Technica forum thread.

The practical issue for enterprise operators is more basic than the label. Battery projects are often described in MW terms, but procurement and system planning need duration, round-trip efficiency, augmentation plans, and dispatch rights. Ars Technica forum participants specifically noted they wanted MWh (or “MW-hours”) for the battery systems and could not find it in linked materials for Green River, even while MW ratings were available.

For large-load buyers, that gap shows up in contract comparability. A 400 MW battery that can discharge for one hour and a 400 MW battery that can discharge for four hours will support very different peak-management strategies, and they will price differently. Without MWh, the resource adequacy value is guesswork.

Where this lands in 2026 planning for grids and large loads

Inside Climate News’ read of the EIA data also provides a timing clue for anyone modeling fuel and capacity exposure. Despite “massive amounts of announced capacity in development” for combined-cycle gas, the outlet reported that only three combined-cycle projects entered operation in the first half of 2026, and that the higher tide of new gas plants is expected a few years out rather than immediately.

That matters for two kinds of operators. First, grid planners and utilities that expect gas additions to carry near-term reliability may need to build more operational playbooks around solar ramping, curtailment, and storage dispatch in the interim. Second, enterprise developers planning data centers, electrified industrial loads, or fleet charging hubs have to evaluate interconnection studies against a grid mix that, based on actual completions, is adding a lot of solar capacity in the day and building storage to reshape it.

The easiest mistake is to treat the first-half 2026 list as a technology popularity contest. It’s a system-design change log. And it’s already influencing how projects will be evaluated in queues, how congestion shows up in nodal pricing, and what “firm” means in a power purchase agreement.

Questions to put in the next PPA, interconnection, or flexibility RFP

• For any storage-backed contract, what is the battery duration in MWh, and what is the guaranteed deliverable power at end of life after augmentation, not just the initial MW nameplate?
• If a project is described as “solar plus battery,” who controls dispatch and charging, the offtaker, the owner, or the ISO, and how are curtailment and congestion risk allocated in the contract?
• For sites in regions expecting a wave of combined-cycle additions “in a few years,” as Inside Climate News reports, what happens to delivered energy economics in the interim under a solar-heavy daytime grid: do load shapes, hedges, and on-site flexibility investments still pencil out?