Idaho CO₂ Emissions
Idaho emitted 21 million metric tons of energy-related CO₂ in 2024, 0.4% of the US total. That ranks it 43rd among the 50 states and the District of Columbia, at 10.5 metric tons per person.
Data year 2024 · Source: U.S. Energy Information Administration, State Energy Data System (June 2026)
How much CO₂ does Idaho emit?
Idaho produced 21 million metric tons of carbon dioxide from burning fossil fuels in 2024. The United States as a whole emitted 4.78 billion metric tons, so Idaho accounts for 0.4% of the national total.
Per person, that is 10.5 metric tons, 26% below the US average of 14.1 metric tons. On that measure Idaho ranks 38th highest of 51.
CO₂ emissions in Idaho since 1990
Energy-related emissions in Idaho have risen by 86% since 1990, from 11 million metric tons to 21 million metric tons. Compared with 2005, the baseline year for many US climate targets and marked on the chart, they have risen by 34%. Emissions peaked in 2023 at 22 million metric tons and are now 3% below that level.
Emissions by sector
Transportation is the largest source of energy-related CO₂ in Idaho, at about 53% of the total, followed by industrial at 14% and electric power at 14%.
Emissions by fuel
Petroleum produces about 60% of the state’s energy-related CO₂, natural gas 40%.
How Idaho compares with other states
These are the states closest to Idaho in the 2024 ranking by total emissions. See the full ranking of all states.
| # | State | Total (Mt) | Share of US | Per person (t) |
|---|---|---|---|---|
| 41 | Connecticut | 37.09 | 0.8% | 10.1 |
| 42 | Montana | 27.16 | 0.6% | 23.9 |
| 43 | Idaho | 21.11 | 0.4% | 10.5 |
| 44 | Hawaii | 17.95 | 0.4% | 12.5 |
| 45 | Maine | 15.99 | 0.3% | 11.4 |
Frequently asked questions
How much CO₂ does Idaho emit per year?
Idaho emitted 21 million metric tons of energy-related CO₂ in 2024, which is 0.4% of the US total of 4.78 billion metric tons.
What are the CO₂ emissions per person in Idaho?
About 10.5 metric tons per person in 2024, 26% below the US average of 14.1 metric tons. That ranks 38th highest of 51.
Have emissions in Idaho fallen since 2005?
They have risen by 34% since 2005 and risen by 86% since 1990. Emissions peaked in 2023 at 22 million metric tons and are now 3% below that level.
What is the biggest source of CO₂ in Idaho?
Transportation is the largest sector, at about 53% of energy-related emissions, followed by industrial at 14%. By fuel, petroleum accounts for 60%.
About the data. Figures are energy-related carbon dioxide emissions: CO₂ from burning coal, natural gas and petroleum, in million metric tons. Emissions from power plants are counted in the state where the electricity is generated, not where it is used. Other greenhouse gases and non-energy sources such as agriculture are not included.
Source: U.S. Energy Information Administration, State Energy Data System, released June 26, 2026. Latest year available: 2024.
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