Coal plants are shutting down because they can no longer compete economically with cheaper alternatives, they’re aging past their useful lifespans, and tightening environmental regulations make continued operation increasingly expensive. The U.S. has already retired an average of 9.8 gigawatts of coal capacity per year over the last decade, and another 8.1 gigawatts is planned for retirement in 2025 alone. The trend is driven by several forces working simultaneously, and understanding each one explains why the closures keep accelerating.
Cheaper Alternatives Have Undercut Coal
The single biggest reason coal plants close is cost. New onshore wind projects now produce electricity at roughly $30 per megawatt-hour, and utility-scale solar comes in around $38 per megawatt-hour. The U.S. Energy Information Administration no longer even includes new coal plants in its cost comparisons for future electricity generation. Coal was simply dropped from the 2025 outlook and replaced with natural gas options, a quiet acknowledgment that no one is building new coal capacity.
Natural gas has also eaten into coal’s market share for years. When gas prices drop, utilities switch from coal to gas because it’s cheaper to burn and produces fewer emissions. This dynamic has been one of the primary forces pushing coal plants into unprofitability. The relationship works both ways: in early 2025, higher natural gas prices actually boosted coal demand temporarily, and S&P Global projects coal generation could hold relatively steady through 2027 as a result. But that’s a short-term reprieve. After 2027, analysts expect natural gas prices to normalize and expanding renewable energy to resume squeezing coal out of the mix. S&P Global forecasts 38.4 gigawatts of coal plant retirements by 2035.
Most Coal Plants Are Simply Old
Coal plants have historically operated for about 40 years before retiring. Many of the plants still running in the U.S. were built in the 1960s and 1970s, which means they’ve already reached or exceeded that typical lifespan. Aging equipment means more frequent breakdowns, higher maintenance costs, and longer periods offline for repairs. At some point, pouring money into a plant that’s already more expensive to run than the alternatives stops making financial sense.
There’s a silver lining in the global data: researchers using predictive models found that 63% of currently operating coal plants worldwide will likely retire earlier than the historical 40-year average. That suggests the economic and regulatory pressures are pulling retirements forward rather than letting plants limp along to the end of their natural lives.
Environmental Rules Raise the Cost of Staying Open
In April 2024, the EPA finalized greenhouse gas standards for power plants under the Clean Air Act. The rule creates different requirements depending on how long a coal plant intends to keep running. Plants that plan to operate past 2039 must install carbon capture systems that remove 90% of their CO2 emissions by January 2032. Plants planning to retire before 2039 but after 2032 face a less demanding standard: they must switch to burning 40% natural gas by 2030, cutting emissions by about 16%. Plants closing before 2032 are essentially exempt, since the EPA determined they don’t have cost-reasonable options for reducing emissions in such a short window.
The carbon capture requirement is the most consequential piece. Adding capture technology to an existing coal plant increases the cost of electricity by more than 3 cents per kilowatt-hour, a substantial hit to a plant’s economics. The total cost works out to roughly $33 per ton of CO2 avoided for a conventional coal plant, and that doesn’t include the additional expense of transporting and storing the captured carbon. For many plant owners, the math is straightforward: retrofitting is more expensive than shutting down and replacing the capacity with gas or renewables.
Coal Closures Save Lives and Crops
Coal plants don’t just emit CO2. They release sulfur dioxide, nitrogen oxides, and fine particulate matter that directly harm human health and damage agriculture. Research from UC San Diego quantified this impact by studying what happened as plants closed between 2005 and 2016. The shutdowns saved an estimated 26,610 lives and preserved 570 million bushels of corn, soybeans, and wheat in the areas surrounding retired plants.
The flip side of that finding is even more striking. Coal plants that remained in operation during that same period contributed to an estimated 329,417 premature deaths and the loss of 10.2 billion bushels of crops, roughly equivalent to half of a typical year’s U.S. production. These health and agricultural costs don’t appear on a utility’s balance sheet, but they represent enormous economic damage borne by nearby communities.
Grid Reliability Complicates the Timeline
Not every coal plant can close on schedule without consequences. Coal provides something that wind and solar currently struggle with: reliable power that doesn’t depend on weather conditions. Grid operators have flagged real concerns about retiring coal capacity faster than replacement sources come online.
In 2025, the Energy Secretary issued an emergency order preventing the closure of the J.H. Campbell coal plant in Michigan after the regional grid operator, MISO, warned of reliability risks. MISO’s own assessments show that new capacity additions in its northern and central zones haven’t been enough to offset the power lost from retirements and reduced output from other sources. The North American Electric Reliability Corporation has warned that the ongoing shift toward weather-dependent resources reduces fuel diversity and increases the risk of supply shortfalls, particularly during winter months. MISO now considers resource adequacy a year-round concern rather than just a summer issue.
This tension between economic reality and grid stability is why many planned coal retirements have been pushed back. Much of the 38.4 gigawatts of projected retirements through 2035 is now expected to happen after 2030 rather than before, giving grid operators and utilities more time to bring replacement capacity online.
The Global Picture Looks Different
While the U.S. coal fleet is clearly shrinking over time, global coal demand tells a more complicated story. The International Energy Agency projects that worldwide coal demand will remain essentially flat through 2025 and 2026, with only a marginal decline bringing consumption just below 2024 levels. U.S. coal demand is actually forecast to grow about 7% in 2025 due to higher natural gas prices pushing utilities temporarily back toward coal. Meanwhile, demand in the European Union is expected to drop by nearly 2%, and China’s coal consumption is forecast to dip by less than 1%.
The pattern is clear even if the timing varies by region: coal is losing ground to cheaper, cleaner alternatives almost everywhere. In the U.S., the combination of unbeatable renewable energy prices, aging infrastructure, stricter emissions rules, and documented public health harms has made coal plant closures less of a policy debate and more of an economic inevitability. The remaining questions are about speed and sequencing, not direction.