I. The math that flipped
Start with how large buyers pay for power. A power purchase agreement, or PPA (a long-term contract where a buyer, often a company or a utility, agrees to buy electricity at a set price for ten or twenty years), is the number a developer watches when deciding what to build. For new Texas solar, those contract prices have sat at the low end of anything on the grid, on the order of a few tens of dollars per megawatt-hour at last public report, though exact terms are private and vary project to project.
A new gas plant has to cover its construction first, and then it has to buy fuel every hour it runs, and natural gas prices move. Sun costs nothing once the panels are up. When you add the roughly four-hour batteries that now ship with most new solar projects, the combined price still tends to land at or below what a new gas peaker would need to break even, by most public estimates. The old floor has a new floor underneath it.
II. Why Texas sun and batteries fit
Houston's demand does not peak at noon when the sun is highest. It peaks in the late afternoon and early evening, when people come home, the air conditioning keeps grinding, and solar output starts to fall. That gap, the stretch between peak sun and peak need, is exactly the problem a battery solves: charge cheaply in the middle of the day, then discharge into the expensive evening hours.
ERCOT runs an energy-only market (there is no separate payment just for promising to be available, unlike some grids in the Northeast), so the money is in selling power when prices are high. Those high-price hours cluster in the summer evenings along the Gulf Coast. A solar-plus-storage project built for that window earns its keep in a way a standalone solar farm cannot, which is why panels and batteries increasingly share one site and one connection to the grid.
III. What the queue is telling us
Look at the interconnection queue, the waiting line of projects that have applied to plug into the ERCOT grid. For several years now that line has been dominated by solar and battery storage, with new gas making up a much smaller share at last public report. Developers vote with their capital, and the capital is going where the math works, on flat land west and south of Houston.
That said, a spot in the queue is not a finished plant. Many projects drop out over land, financing, or the cost of upgrading nearby transmission, so the share that actually gets built is far smaller than the share that applies. ERCOT's comparatively fast connection process helps Texas build quicker than most states, but heat waves, supply chains, and policy changes can all slow things down. The direction is clear. The pace is not.
IV. Worth watching this month
1. ERCOT's monthly interconnection queue and its Capacity, Demand and Reserves report, which show how much solar and storage is lined up against gas and update on a routine schedule, are the plainest place to watch the trend.
2. The summer peak demand records, which ERCOT posts publicly and which have been broken repeatedly in recent years, are a rough gauge of how hard storage will be asked to work.
3. Any Public Utility Commission of Texas meeting on market design is the one that actually matters here, since the state has debated adding payments for firm capacity that could shift the gas-versus-storage math.
4. CenterPoint Energy filings and outage maps for the Houston area are routine, but worth a look if a transmission upgrade near your neighborhood is on the table.
5. EIA's monthly Texas electricity data lags by a month or two, yet it remains the most checkable public record of what actually generated power.
Questions readers ask
Does cheaper wholesale power mean my bill goes down?
Not directly. Your Houston bill blends wholesale energy costs with CenterPoint delivery charges and the terms of your retail plan, so cheaper new generation shows up slowly and only in part, if at all.
Are batteries reliable in a Texas heat wave?
They help most with the daily evening ramp, charging midday and covering the early-evening peak. In a multi-day crisis like the February 2021 winter storm, roughly four-hour batteries drain fast, so they are a tool, not a cure-all.
Is gas going away?
No. Gas still provides a large share of ERCOT power and will for years. The change is that far less new gas is being built than solar and storage, not that existing plants are retiring quickly.
Why does Texas build this faster than other states?
ERCOT's grid sits mostly inside Texas, so it avoids much of the federal interconnection process, and its connection rules are comparatively quick. Abundant flat, sunny, inexpensive land helps too.
Sources of record
- ERCOT, grid operator for most of Texas, The operator's own data on what is connected and what is waiting in the interconnection queue., www.ercot.com/gridinfo/generation
- ERCOT Capacity, Demand and Reserves report (grid operator), Routine look-ahead at how much solar, storage, and gas capacity is expected on the grid., www.ercot.com/gridinfo/resource
- U.S. Energy Information Administration, Texas profile (federal government), Federal data on Texas generation, fuel mix, and electricity prices; the most checkable public record., www.eia.gov/state/?sid=TX
- Public Utility Commission of Texas (state government), The state regulator; market-design dockets and meeting agendas that can move the gas-versus-storage math., www.puc.texas.gov
- National Renewable Energy Laboratory (federal government), Federal lab estimates of technology costs for solar, storage, and gas., www.nrel.gov
- CenterPoint Energy (Houston-area utility), Houston's wires company; outage maps and transmission filings relevant to local projects., www.centerpointenergy.com