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By Todd Myers
Washington Policy Center 

Washington's CO2 tax ends the year at about 43 cents a gallon, but increases are coming


December 28, 2023

Washington’s new tax on CO2 emissions ended up adding about 43 cents per gallon of gas for 2023. The final price was reduced by several market interventions by Department of Ecology staff, but prices are likely to increase next year.

Ecology staff released the results from the fourth-quarter auction of CO2 emission allowances. The settlement price was $51.89, a significant drop from the previous auction price of $63.03.

The average tax on CO2 in 2023 ended up at $54.74 per metric ton, which equates to about 43 cents per gallon of gasoline and 53 cents per gallon for diesel.

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