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Source: U.S. Energy Information Administration, Annual Energy Outlook 2019
EIA’s long-term projections show that most of the electricity generating capacity additions installed in the United States through 2050 will be natural gas combined-cycle and solar photovoltaic (PV). Onshore wind looks to be competitive in only a few regions before the legislated phase-out of the production tax credit (PTC), but it becomes competitive later in the projection period as demand increases and the cost for installing wind turbines continues to decline.
For EIA’s Annual Energy Outlook 2019 (AEO2019), EIA calculates two measures that, when used together, provide an intuitive framework for understanding the capacity expansion decisions modeled for utility-scale power plants—those with a capacity rating of 1 megawatt (MW) or greater.
The levelized cost of electricity (LCOE) represents the cost to build and operate a power plant, converted to a level stream of payments over the plant’s assumed financial lifetime. Installed capital costs include construction costs and financing costs. Operating costs include fuel costs (for power plants that consume fuel) and expected maintenance costs. LCOEs may also include other applicable tax credits or subsidies.
The levelized avoided cost of electricity (LACE) accounts for the differences in the grid services each generating technology is providing (a power plant’s value) to the grid. For example, natural gas combined-cycle plants and coal plants provide dispatchable baseload services to the grid and thus have similar LACE values, even if their LCOE values differ. A generator’s avoided cost provides a proxy for the potential revenues from sales of electricity generated. As with LCOE, these revenues are converted to a level stream of payments over the plant’s assumed financial lifetime.
The ratio of these two measures serves as a value-to-cost ratio. Power plants are considered economically attractive when their projected LACE exceeds their projected LCOE, meaning their value-cost ratio exceeds one.
The relative costs and values of several technology options are calculated for each of the 22 electricity regions in the modeling system used to inform EIA’s Annual Energy Outlook. Calculations start in 2021 because that is the first feasible year that all three technologies are available to come online in the model, given the assumed construction lead-time and licensing requirements.
Source: U.S. Energy Information Administration, Annual Energy Outlook 2019 and Levelized Cost and Levelized Avoided Cost of New Generation Resources in the Annual Energy Outlook 2019
Because both LCOE and LACE are levelized over the lifetime of the plant, these values change over time. Natural gas combined-cycle units’ LCOEs increases gradually as natural gas prices rise. Utility-scale solar photovoltaic (PV) and onshore wind’s LCOEs initially increase as a result of the loss of the tax credits but then decrease because of the continued decline in installed costs. Wind’s LCOE may also increase as the best wind resource sites are built out and new projects must be installed in areas that have either lower wind resources or less ease of access.
Natural gas combined-cycle units are considered, on average, the marginal source of electricity generation through 2050, meaning the cost of electricity generation from this technology is most often the basis of comparison for new power plants. As natural gas prices increase, the marginal source becomes more expensive to operate, and the value to the grid of avoiding this cost by building new capacity increases, as seen in the general upward trend in LACE for natural gas combined-cycle and onshore wind.
Conversely, solar PV’s LACE is generally flat to declining during the projection period. As solar penetration in the grid increases, solar capacity saturates during the midday hours, causing the value of electricity delivered in those hours to decrease.
In the AEO2019 Reference case, natural gas combined-cycle’s value-cost ratio is closest to 1.0 throughout the projection, indicating that its value just covers its costs. Natural gas combined-cycle units account for the largest share of new power plants (43% of the utility-scale total from 2021 through 2050). Solar PV’s value-cost ratio is slightly less than 1.0, indicating that, on average, its value does not cover its costs, but capacity is still added. In some cases, these solar PV additions may be uneconomic, but they still occur to satisfy the renewable portfolio standard (RPS) requirements in 29 states and the District of Columbia.
Onshore wind’s value-cost ratio remains lower than 1.0 throughout the projection period and lower than solar PV. Consequently, little onshore wind is installed in the Reference case, except in the near term when wind capacity is built to take advantage of the available PTC.
More information about LCOE, LACE, and economic competitiveness of electricity generating technologies is available in EIA’s Levelized Cost and Levelized Avoided Cost of New Generation Resources in the Annual Energy Outlook 2019 report.
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In 2019, consumption of renewable energy in the United States grew for the fourth year in a row, reaching a record 11.5 quadrillion British thermal units (Btu), or 11% of total U.S. energy consumption. The U.S. Energy Information Administration’s (EIA) new U.S. renewable energy consumption by source and sector chart published in the Monthly Energy Review shows how much renewable energy by source is consumed in each sector.
In its Monthly Energy Review, EIA converts sources of energy to common units of heat, called British thermal units (Btu), to compare different types of energy that are more commonly measured in units that are not directly comparable, such as gallons of biofuels compared with kilowatthours of wind energy. EIA uses a fossil fuel equivalence to calculate primary energy consumption of noncombustible renewables such as wind, hydro, solar, and geothermal.
Source: U.S. Energy Information Administration, Monthly Energy Review
Wind energy in the United States is almost exclusively used by wind-powered turbines to generate electricity in the electric power sector, and it accounted for about 24% of U.S. renewable energy consumption in 2019. Wind surpassed hydroelectricity to become the most-consumed source of renewable energy on an annual basis in 2019.
Wood and waste energy, including wood, wood pellets, and biomass waste from landfills, accounted for about 24% of U.S. renewable energy use in 2019. Industrial, commercial, and electric power facilities use wood and waste as fuel to generate electricity, to produce heat, and to manufacture goods. About 2% of U.S. households used wood as their primary source of heat in 2019.
Hydroelectric power is almost exclusively used by water-powered turbines to generate electricity in the electric power sector and accounted for about 22% of U.S. renewable energy consumption in 2019. U.S. hydropower consumption has remained relatively consistent since the 1960s, but it fluctuates with seasonal rainfall and drought conditions.
Biofuels, including fuel ethanol, biodiesel, and other renewable fuels, accounted for about 20% of U.S. renewable energy consumption in 2019. Biofuels usually are blended with petroleum-based motor gasoline and diesel and are consumed as liquid fuels in automobiles. Industrial consumption of biofuels accounts for about 36% of U.S. biofuel energy consumption.
Solar energy, consumed to generate electricity or directly as heat, accounted for about 9% of U.S. renewable energy consumption in 2019 and had the largest percentage growth among renewable sources in 2019. Solar photovoltaic (PV) cells, including rooftop panels, and solar thermal power plants use sunlight to generate electricity. Some residential and commercial buildings heat with solar heating systems.
Source: U.S. Energy Information Administration, Annual Electric Generator Inventory
Based on the U.S. Energy Information Administration's (EIA) annual survey of electric generators, natural gas-fired generators accounted for 43% of operating U.S. electricity generating capacity in 2019. These natural gas-fired generators provided 39% of electricity generation in 2019, more than any other source. Most of the natural gas-fired capacity added in recent decades uses combined-cycle technology, which surpassed coal-fired generators in 2018 to become the technology with the most electricity generating capacity in the United States.
Technological improvements have led to improved efficiency of natural gas generators since the mid-1980s, when combined-cycle plants began replacing older, less efficient steam turbines. For steam turbines, boilers combust fuel to generate steam that drives a turbine to generate electricity. Combustion turbines use a fuel-air mixture to spin a gas turbine. Combined-cycle units, as their name implies, combine these technologies: a fuel-air mixture spins gas turbines to generate electricity, and the excess heat from the gas turbine is used to generate steam for a steam turbine that generates additional electricity.
Combined-cycle generators generally operate for extended periods; combustion turbines and steam turbines are typically only used at times of peak load. Relatively few steam turbines have been installed since the late 1970s, and many steam turbines have been retired in recent years.
Source: U.S. Energy Information Administration, Annual Electric Generator Inventory
Not only are combined-cycle systems more efficient than steam or combustion turbines alone, the combined-cycle systems installed more recently are more efficient than the combined-cycle units installed more than a decade ago. These changes in efficiency have reduced the amount of natural gas needed to produce the same amount of electricity. Combined-cycle generators consume 80% of the natural gas used to generate electric power but provide 85% of total natural gas-fired electricity.
Source: U.S. Energy Information Administration, Annual Electric Generator Inventory
Every U.S. state, except Vermont and Hawaii, has at least one utility-scale natural gas electric power plant. Texas, Florida, and California—the three states with the most electricity consumption in 2019—each have more than 35 gigawatts of natural gas-fired capacity. In many states, the majority of this capacity is combined-cycle technology, but 44% of New York’s natural gas capacity is steam turbines and 67% of Illinois’s natural gas capacity is combustion turbines.
Countries that are not members of the Organization for Economic Cooperation and Development (OECD) in Asia, including China and India, and in Africa are home to more than two-thirds of the world population. These regions accounted for 44% of primary energy consumed by the electric sector in 2019, and the U.S. Energy Information Administration (EIA) projected they will reach 56% by 2050 in the Reference case in the International Energy Outlook 2019 (IEO2019). Changes in these economies significantly affect global energy markets.
Today, EIA is releasing its International Energy Outlook 2020 (IEO2020), which analyzes generating technology, fuel price, and infrastructure uncertainty in the electricity markets of Africa, Asia, and India. A related webcast presentation will begin this morning at 9:00 a.m. Eastern Time from the Center for Strategic and International Studies.
Source: U.S. Energy Information Administration, International Energy Outlook 2020 (IEO2020)
IEO2020 focuses on the electricity sector, which consumes a growing share of the world’s primary energy. The makeup of the electricity sector is changing rapidly. The use of cost-efficient wind and solar technologies is increasing, and, in many regions of the world, use of lower-cost liquefied natural gas is also increasing. In IEO2019, EIA projected renewables to rise from about 20% of total energy consumed for electricity generation in 2010 to the largest single energy source by 2050.
The following are some key findings of IEO2020:
IEO2020 builds on the Reference case presented in IEO2019. The models, economic assumptions, and input oil prices from the IEO2019 Reference case largely remained unchanged, but EIA adjusted specific elements or assumptions to explore areas of uncertainty such as the rapid growth of renewable energy.
Because IEO2020 is based on the IEO2019 modeling platform and because it focuses on long-term electricity market dynamics, it does not include the impacts of COVID-19 and related mitigation efforts. The Annual Energy Outlook 2021 (AEO2021) and IEO2021 will both feature analyses of the impact of COVID-19 mitigation efforts on energy markets.
Source: U.S. Energy Information Administration, International Energy Outlook 2020 (IEO2020)
Note: Click to enlarge.
With the IEO2020 release, EIA is publishing new Plain Language documentation of EIA’s World Energy Projection System (WEPS), the modeling system that EIA uses to produce IEO projections. EIA’s new Handbook of Energy Modeling Methods includes sections on most WEPS components, and EIA will release more sections in the coming months.
