Add up every utility-scale power plant in the United States and you get a machine of staggering scale. It provides well over a million megawatts of generating capacity, spread across tens of thousands of sites, drawing on nine different primary energy sources. The maps on this site break that machine apart fuel by fuel; this article puts it back together, using the same EIA-860 figures that drive every map, to show how the whole fleet fits and where it is going. It is worth saying at the outset why a snapshot like this is interesting at all. The US power system is in the middle of its biggest transformation since electrification; coal is collapsing, gas is entrenched, solar and wind are exploding, nuclear is stirring back to life, and batteries are arriving as a genuinely new category. No single number captures the whole picture, but the shape of the fleet, read across all ten pages, tells the story clearly.
The most important concept to understand power figures on this site is the distinction between capacity and generation. Capacity, measured in megawatts (MW), is how much a plant could produce running flat out. Generation, measured in megawatt-hours, is how much it actually produces over time. The ratio between the two, over a year, is called the capacity factor, and it varies enormously by technology.
A nuclear plant runs above 90 percent of the time and so converts almost all of its capacity into round-the-clock generation. A combined-cycle gas plant might run 50–60 percent of the hours in a year. A wind farm typically lands near 35 percent, a solar farm closer to 25 percent, because the wind is intermittent and the sun sets every evening. The consequence of this disparity is that a fleet that looks balanced by megawatts, on paper, is actually reliant on energy sources that run the most hours. Two hundred megawatts of solar and two hundred megawatts of nuclear are the same on a capacity map and completely different on an electricity bill. Keep that in mind for every total below: this site maps capacity, the potential, not the delivered kilowatt-hours.
By active capacity, nothing else is close to natural gas. The gas page counts roughly 574 gigawatts of active capacity across about two thousand operating plants, which is more than coal, nuclear and hydro combined. Gas earned that dominance over two decades. Cheap shale gas after 2008 collapsed fuel prices; efficient combined-cycle plants squeezed more electricity out of each unit of fuel than anything before them; and fast-starting simple-cycle turbines and engines gave grid operators a dispatchable resource they could call on in minutes. Gas now plays two distinct roles, both visible on its map. Large combined-cycle plants provide efficient bulk power for much of the day. Smaller peaking turbines and engines sit ready to cover demand spikes and to fill in when wind and solar fade. Far from being rendered obsolete by renewables, gas has become the flexible partner that makes a renewables-reliant grid workable; it has been established as the resource that ramps up at sunset when solar disappears. It is also still being built, with dozens of plants in development, even as its role shifts from steady baseload toward balancing.
Coal tells the opposite story in the same units. The coal page shows roughly as many decommissioned plants (225) as operating ones (207), with essentially nothing in development. It appears as though the entire fleet's trajectory is trending towards retirement. Cheap gas undercut coal on price, tightening emissions rules raised its costs, and renewables ate into its hours. Plants built to run flat out for decades now cycle on and off or sit idle for stretches. Yet because the survivors are large baseload units, coal still represents around 181 GW of active capacity which is second only to gas among thermal sources, and almost double that of nuclear. That tension defines US coal today. It is simultaneously an enormous fleet and it is dying. Every plant retirement removes a big block of dispatchable capacity that the grid must replace, which is one reason gas, batteries and even reserved standby plants matter so much.
Only 54 nuclear plants are active, but at about 97 GW running near full output almost every hour, they generate roughly a fifth of all US electricity and about half of its carbon-free electricity from a handful of sites. A single station like Palo Verde in Arizona, the largest power plant of any kind in the country, out-produces hundreds of solar farms. It is worth taking into consideration the vast difference of land usage between nuclear and other carbon-free energy sources; it takes approximately 39,000 more acres of land for forty solar farms to match the megawatt-hours (MWh) output that just one nuclear power plant generates. After decades in which the only news was the occasional early retirement, the nuclear page now shows restart-pending units and the first new builds in a generation. This small but striking reversal is driven by surging electricity demand, due in large part to AI data centers, and a renewed appetite for stable, clean power.
Renewables are where the fleet is growing fastest, and they have already climbed the capacity table. Wind stands at roughly 166 GW of active capacity across some 1,373 farms, concentrated in a great corridor from Texas up through the Great Plains and Midwest. Utility-scale solar has reached about 165 GW across more than seven thousand farms and is expanding into nearly every state. Each green energy source has now surpassed the active US nuclear and coal fleets by nameplate capacity; although, taking into account the capacity factor, they have not yet surpassed nuclear by annual generation.
Behind Solar and Wind sit the firm renewables. Hydroelectric power, the original American renewable, holds steady at roughly 102 GW behind some of the largest structures ever built. Its pumped-storage plants act as the biggest grid batteries in the US to date, and an average plant can store anywhere from 1,000 to 3,000 MWh of electricity. That's enough energy to output roughly ten hours of full-capacity electricity to the grid. Geothermal (around 3.5 GW) and biomass (a few gigawatts) are niche by comparison, but they offer something wind and solar cannot: weather-independent, around-the-clock renewable output. Together these firm sources are the quiet ballast of the clean-energy transition.
The clearest signal of where the fleet is heading is not the currently installed base, but instead, the development pipeline. On the solar page alone, more than a thousand farms are listed as in development, and that is more than every other technology on this site combined. Wind adds dozens more, including gigawatt-scale offshore projects off the Atlantic coast. Gas still adds new plants, but the center of gravity for new capacity has shifted decisively to solar, wind and the batteries that increasingly accompany them. One large category that does not appear as its own page here at all is battery storage, which EIA tracks separately. It is both the fastest-growing addition to the grid and the fulcrum on which the US's solar-heavy future balances.
Capacity totals hide geography, and geography is where the maps earn their keep. Gas clusters along the Gulf Coast and throughout the populous East; coal concentrates in the Ohio and Tennessee valleys and the Great Plains; wind runs up the center of the country; solar blankets California, the desert Southwest, Texas and, increasingly, the Carolinas and Midwest; hydro dominates the Pacific Northwest; and petroleum survives mainly where pipelines and big grids do not reach. Alaska, Hawaii, Puerto Rico and remote communities are examples of where petroleum becomes an absolute necessity. Click through the ten maps in sequence and the physical geography of the country's power generation comes into focus in a way that no single data table can easily convey.
That is the real value of looking at the whole fleet at once: it turns a transition usually described in slogans into something you can see, plant by plant. Explore the underlying data on the Natural Gas, Coal, Nuclear, Wind, Solar, Hydroelectric, Geothermal, Biomass and Petroleum pages.