Levels of carbon dioxide (CO2) and other greenhouse gases (GHG) in the atmosphere have increased dramatically in the past few decades. Solar energy is a renewable, carbon-free resource available within every geographic region of the U.S. with great potential to significantly reduce our nation’s GHG emissions.
- Top sectors producing GHG emissions in the U.S.: the electric power industry (28%), transportation (28%), industry (22%), commercial and residential combined (11%), and agriculture (9%)
- Both concentrating solar power (CSP) and photovoltaic (PV) technologies produce clean, emissions-free electricity that can help reduce U.S. GHG emissions
- Solar heating and cooling systems can provide about 80% of the energy used for space heating and water heating needs.
Sources of GHG Emissions in the United States by Sector
Many scientists now agree that climate change is caused by an increase of greenhouse gas (GHG) emissions in the atmosphere. The GHG emissions in the United States come from a variety of different economic sectors, with the most prominent sectors being the electric power (28%) and transportation (28%) sectors, followed by industry (22%), commercial and residential consumption (11%) and agriculture (9%).1 While there may be not be one technology that can reduce all U.S. GHG emissions to zero, solar technologies come close. Solar energy is a solution to climate change and can significantly reduce emissions in each of these sectors.
More than a third of U.S. GHG emissions result from the burning of fossil fuels for electricity usage in buildings and homes. Both Concentrating Solar Power (CSP) and Photovoltaic (PV) technologies produce clean, emissions-free electricity and can feed this electricity right back into the U.S. grid. Solar Heating and Cooling (SHC) technologies can also be used to displace the need for electricity. Through the first half of 2018, the U.S. now has more than 55,900 megawatts (MW) of cumulative installed solar electric capacity, enough to power more than 10.7 million average American homes, and offset 71 million metric tons of carbon dioxide emissions.2
Electric vehicles and plug-in hybrids are widely seen as one of the near-term climate change solutions in the transportation sector, especially when these vehicles are charged by a solar-powered carport or charging station.
The U.S. is a highly industrialized country, and therefore a large portion of our GHG emissions stem from the industrial sector. The manufacturing of common materials such as aluminum and steel are energy intensive and generate high levels of GHG emissions. One of the main uses for energy in the industrial sector is for boiler fuel, meaning that energy is needed to generate steam or heat water, which is then transferred to a boiler vessel. Another use for energy is for process heating, when energy is directly used to raise the temperature in a manufacturing process, such as in drying paint in the automobile industry, and cooking packaged foods.3 Solar energy can offset the need for fossil fuels by generating high-temperature and medium-temperature heat from CSP and SHC technologies.
Commercial and Residential Sectors
The commercial sector includes buildings such as offices, malls, warehouses, schools, restaurants, and hospitals, while the residential sector consists of homes and apartments. Both commercial and residential buildings spend the majority of the energy consumed on space heating, space cooling, and water heating. This is a perfect application for SHC technologies, as the SHC systems can provide about 80% of the energy used for space heating and water heating needs. Furthermore, solar air conditioning can be used as a clean, emissions-free solution to meet cooling needs instead of using electricity.
Solar produces less life-cycle ghg emissions than conventional fossil fuel energy sources.4 While there may be some ghg emissions produced during the manufacturing and recycling of the solar system, the generation of energy from the solar system results in zero ghg emissions and zero environmental impact.
SEIA supports comprehensive climate and energy legislation, and is opposed to any legislation that would weaken the Clean Air Act. The U.S. Environmental Protection Agency (EPA) is also moving forward with rules on the Mandatory Reporting of Greenhouse Gases, including a plan to regulate GHG under the Clean Air Act.
SEIA encourages all countries to use solar energy as countries transition to a sustainable clean energy future.
SEIA previously participated in the 16th and 15th Conference of the Parties (COP) under the UNFCCC in Cancun and Copenhagen, respectively, to highlight the role that solar energy can play in combating climate change. SEIA worked with multiple solar groups from around the world to have one message at the conferences: solar energy means more jobs, more energy, and less CO2.
Other Helpful Resources
- Intergovernmental Panel on Climate Change - International scientific body that compiles data for the assessment of climage change, including environmental, social, and economic impacts.
- Greenhouse Gas Reporting Program- A program run through the EPA in response to the Mandatory Reporting of Greenhouse Gases Rule (74 FR 56260) which requires reporting of ghg data and other relevant information from large sources and suppliers in the U.S. to inform future policy decisions.
- Greenhouse Gas Data from UNFCCC- data from countries around the world.
1U.S. EPA Greenhouse Gas Inventory Report. Accessible here: https://www.epa.gov/ghgemissions/inventory-us-greenhouse-gas-emissions-and-sinks
2 U.S. Solar Market Insight Report Q2 2013 Report. Accessible here: http://www.seia.org/research-resources/solar-industry-data