Coal power in the United States

Coal has been used to generate electricity in the United States since an Edison plant was built in New York City in 1882. The first AC power station was opened by General Electric in Ehrenfeld, Pennsylvania in 1902, servicing the Webster Coal and Coke Company. By the mid-20th century, coal had become the leading fuel for generating electricity in the US. The long, steady rise of coal-fired generation of electricity shifted to a decline after 2007. The decline has been linked to the increased availability of natural gas, decreased consumption, renewable power, and more stringent environmental regulations. The Environmental Protection Agency has advanced restrictions on coal plants to counteract mercury pollution, smog, and global warming.

Trends, comparisons, and forecasts

The average share of electricity generated from coal in the US has dropped from 52.8% in 1997 to 19.7% in 2022. In 2017, there were 359 coal-powered units at the electrical utilities across the US, with a total nominal capacity of 256 GW (compared to 1024 units at a nominal 278 GW in 2000). The actual average generated power from coal in 2006 was 227.1 GW (1991 TWh per year), the highest in the world and still slightly ahead of China (1950 TWh per year) at that time. In 2000, the US average production of electricity from coal was 224.3 GW (1966 TWh for the year). In 2006, US electrical generation consumed 1,027 million short tons (932 million metric tons) or 92.3% of the coal mined in the US. In 2021, coal supplied 9.5 quadrillion British thermal units (2,800 TWh) of primary energy to electric power plants, which made up 90% of coal's contribution to U.S. energy supply.

Due to emergence of shale gas, coal consumption declined from 2009. In the first quarter of 2012, the use of coal for electricity generation declined substantially more, 21% from 2011 levels. According to the U.S. Energy Information Administration, 27 gigawatts of capacity from coal-fired generators is to be retired from 175 coal-fired power plants between 2012 and 2016. Natural gas showed a corresponding increase, increasing by a third over 2011. Coal's share of electricity generation dropped to just over 36%. Coal use continues to decline rapidly through November 2015 with its share around 33.6%.

The coal plants are mostly base-load plants with typical utilisation rates of 50% to 60% (relating to full load hours).

Utility companies have shut down and retired aging coal-fired power plants following the Environmental Protection Agency's (EPA) implementation of the Cross-State Air Pollution Rule (CSAP). The extent of shutdowns and reduction in utilization depend on factors such as future price of natural gas and cost of installation of pollution control equipment; however, as of 2013, the future of coal-fired power plants in the United States did not appear promising. In 2014 estimates gauged that an additional 40 gigawatts (GW) of coal-fired capacity would retire until 2020, in addition to the nearly 20GW that already had retired as of 2014. This is driven most strongly by inexpensive natural gas competing with coal, and EPA's Mercury and Air Toxics Standards (MATS), which require significant reductions in emissions of mercury, acid gases, and toxic metals, scheduled to take effect in April 2015. Over 13 GW of coal power plants built between 1950 and 1970 were retired in 2015, averaging 133 MW per plant. In Texas, the price drop of natural gas has reduced the capacity factor in 7 of the state's coal plants (max. output 8 GW), and they contribute about a quarter of the state's electricity.

The cost of transporting coal may be around $20/ton for trains, or $5–6/ton for barge and truck. A 2015 study by a consortium of environmental organizations concluded that US Government subsidies for coal production are around $8/ton for the Powder River Basin.

In 2018, 16 of the 50 Federal States of the US had either no coal power in their power production for the public power supply (California, Idaho, Massachusetts, Rhode Island and Vermont), less than 5% coal in power production (Connecticut, Maine, New Hampshire, New Jersey, New York, Delaware) or between 5 and 10% (Alaska, Nevada, Mississippi, Oregon and Washington State)

In 2023, the United States experienced a notable decrease in coal capacity, with 9.7 gigawatts (GW) of coal power being retired. This represents a reduction in the rate of coal plant retirements compared to previous years, suggesting a deceleration in the phasing out of coal infrastructure in the country.

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Death and disease

Deaths from coal power from 1999 to 2020 are estimated at 460,000, mostly in the first decade. Due to measures such as scrubbers, air pollution from coal plants killed far fewer people by the 2020s, but still estimated at thousands each year with 1600 deaths in 2020 from PM₂₅ alone. As of 2026 a few plants emit mercury, lead or arsenic; due to regulations which have been described as allowing “brain poison”.

Ground-level ozone can aggravate asthma. Sulfur dioxide can cause respiratory disease. A 2025 study concluded that phasing out coal would make people in Texas and Pennsylvania healthier.

Environmental impacts

Ash ponds can pollute groundwater. In the late 20th century sulfur dioxide from coal plants caused acid rain. Emissions from electricity generation account for the 2nd largest share of greenhouse gas emissions by the United States after transportation. Although coal power produces a small share of electricity in the mid-2020s it emits a lot of CO₂, 1,400 to 1,500 million metric ton of CO₂ emissions each year.

Public debate

Advocates

In 2007 an advertising campaign was launched to improve public opinion on coal power titled America's Power. This was done by the American Coalition for Clean Coal Electricity (then known as Americans for Balanced Energy Choices), a pro-coal organization started in 2000.

Opposition

In the face of increasing electricity demand through the 2000s, the US has seen a "Growing Trend Against Coal-Fired Power Plants". In 2005, the 790 MW Mohave Power Station closed rather than implement court ordered pollution controls. In 2006 through 2007 there was first a bullish market attitude towards coal with the expectation of a new wave of plants, but political barriers and pollution concerns escalated exponentially, which is likely to damage plans for new generation and put pressure on older plants. In 2007, 59 proposed coal plants were canceled, abandoned, or placed on hold by sponsors as a result of financing obstacles, regulatory decisions, judicial rulings, and new global warming legislation.

The Stop Coal campaign has called for a moratorium on the construction of any new coal plants and for the phase-out of all existing plants, citing concern for global warming. Others have called for a carbon tax and a requirement of carbon sequestration for all coal power plants.

The creation in January 2009 of a Presidential task force (to look at ways to alter the energy direction of the United States energy providers) favors the trend away from coal-fired power plants.

Statistics

Phase-out

Coal generated about 19.5% of the electricity at utility-scale facilities in the United States in 2022, down from 38.6% in 2014 and 51% in 2001. In 2021, coal supplied 9.5 quadrillion British thermal units (2,800 TWh) of primary energy to electric power plants, which made up 90% of coal's contribution to U.S. energy supply.

In 2007, 154 new coal-fired plants were on the drawing board in 42 states. By 2012, that had dropped to 15, mostly due to new rules limiting mercury emissions, and limiting carbon emissions to 1,000 pounds of CO₂ per megawatt-hour of electricity produced. In 2013, the last major coal-fired power plant built in the United States, the 932 MW Sandy Creek Energy Station in Texas, was connected to the grid. By September 2022, there were no active plans to expand coal-fired generating capacity in the United States. In 2026 a new 1.25 GW coal fired generator was proposed for Alaska. .

In July 2013, United States Secretary of Energy Ernest Moniz outlined the Obama administration's policy on fossil fuels:

In the last four years, we've more than doubled renewable energy generation from wind and solar power. However, coal and other fossil fuels still provide 80 percent of our energy, 70 percent of our electricity, and will be a major part of our energy future for decades. That's why any serious effort to protect our kids from the worst effects of climate change must also include developing, demonstrating and deploying the technologies to use our abundant fossil fuel resources as cleanly as possible.

Then-US Energy Secretary Steven Chu and researchers for the US National Renewable Energy Laboratory have noted that greater electrical generation by non-dispatchable renewables, such as wind and solar, will also increase the need for flexible natural gas-powered generators, to supply electricity during those times when solar and wind power are unavailable. Gas-powered generators have the ability to ramp up and down quickly to meet changing loads.

In the US, many of the fossil fuel phase-out initiatives have taken place at the state or local levels.

In November 2021, the US refused to sign up to coal phaseout agreement at the COP26 climate summit.

California

California's SB 1368 created the first governmental moratorium on new coal plants in the United States. The law was signed in September 2006 by Republican Governor Arnold Schwarzenegger, took effect for investor-owned utilities in January 2007, and took effect for publicly owned utilities in August 2007. SB 1368 applied to long-term investments (five years or more) by California utilities, whether in-state or out-of-state. It set the standard for greenhouse gas emissions at 1,100 pounds of carbon dioxide per megawatt-hour, equal to the emissions of a combined-cycle natural gas plant. This standard created a de facto moratorium on new coal, since it could not be met without carbon capture and sequestration.

Maine

On 15 April 2008, Maine Governor John Baldacci signed LD 2126, "An Act To Minimize Carbon Dioxide Emissions from New Coal-Powered Industrial and Electrical Generating Facilities in the State." The law, which was sponsored by Rep. W. Bruce MacDonald (D-Boothbay), requires the Board of Environmental Protection to develop greenhouse gas emission standards for coal gasification facilities. It also puts a moratorium in place on building any new coal gasification facilities until the standards are developed.

Oregon

In early March 2016, Oregon lawmakers approved a plan to stop paying for out-of-state coal plants by 2030 and require a 50 percent renewable energy standard by 2040. Environmental groups such as the American Wind Energy Association and leading Democrats praised the bill.

Texas

In 2006, a coalition of Texas groups organized a campaign in favor of a statewide moratorium on new coal-fired power plants. The campaign culminated in a "Stop the Coal Rush" mobilization, including rallying and lobbying, at the state capital in Austin on 11 and 12 February 2007. Over 40 citizen groups supported the mobilization.

In January 2007, a resolution calling for a 180-day moratorium on new pulverized coal plants was filed in the Texas Legislature by State Rep. Charles Anderson (R-Waco) as House Concurrent Resolution 43. The resolution was left pending in committee. On 4 December 2007, Rep. Anderson announced his support for two proposed integrated gasification combined cycle (IGCC) coal plants proposed by Luminant (formerly TXU).

Washington state

Washington has followed the same approach as California, prohibiting coal plants whose emissions would exceed those of natural gas plants. Substitute Senate Bill 6001 (SSB 6001), signed on 3 May 2007, by Governor Christine Gregoire, enacted the standard. As a result of SSB 6001, the Pacific Mountain Energy Center in Kalama was rejected by the state. However, a new plant proposal, the Wallula Energy Resource Center, shows the limits of the "natural gas equivalency" approach as a means of prohibiting new coal plants. The proposed plant would meet the standard set by SSB 6001 by capturing and sequestering a portion (65 percent, according to a plant spokesman) of its carbon.

Hawaii

Hawaii officially banned the use of coal on September 12, 2020, when Governor Ige enacted Act 23 (SB2629). The law prohibited the issuing or renewing permits for coal power plants after December 31, 2022, and prohibited the extension of the power purchase agreement between AES and Hawaiian Electric. The power purchase agreement for the last coal plant, located on Oahu, expired September 1, 2022, this became the effective retirement date for the coal plant. On September 1, 2022, Hawaii would be completely coal-free with the coal plant's retirement. Hawaii planned to transition to renewable energy to replace the energy produced by coal. The projects slated to replace the coal plant include nine solar plus battery projects, as well as a standalone battery storage project.