Common Carbon Cost & Fuel Fee Rates

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Common Carbon Cost Values

Greenhouse gas emissions reporting began in 2008 and the first COI Fee invoices were sent for fiscal year 2010-11. The State of California fiscal year begins on July 1 and ends on June 30 of the following calendar year.

Fiscal YearEmissions YearUnitsCommon Carbon Cost
2023-242021$ / MTCO2e0.44193683
2022-232020$ / MTCO2e0.34594398
2021-222019$ / MTCO2e0.26831290*
2020-212018$ / MTCO2e0.29777264
2019-202017$ / MTCO2e0.25898034
2018-192016$ / MTCO2e0.25218845
2017-182015$ / MTCO2e0.19815043
2016-172014$ / MTCO2e0.14829626
2015-162013$ / MTCO20.15118302
2014-152012$ / MTCO20.12133986
2013-142011$ / MTCO20.145
2012-132010$ / MTCO20.18
2011-122009$ / MTCO20.17
2010-112008$ / MTCO20.171

Note: Before 2014, only CO2 emissions were subject to COI fees. Starting with data year 2014, the COI Fee Regulation includes other greenhouse gases (methane and nitrous oxide) and emissions are expressed in metric tons of CO2 equivalent (MTCO2e).

*The reduction in Common Carbon Cost (CCC) was due to a surplus returned to the fund from a previous fiscal year and a reduction in program related expenditure.

Fuel Fee Rates (CCC x Fuel Emission Factor)

Transportation fuel fee rates provide the per gallon cost associated with implementation of the COI Fee Regulation. Transportation fuel fee rates are calculated by multiplying the CCC by the transportation fuel emission factors (below).

Fiscal YearFuel TypeFuel Fee Rate ($ / gallon)
2023-24CA Diesel0.004524086
CA Gasoline0.003809629
2022-23CA Diesel0.003541412
CA Gasoline0.002982142
2021-22CA Diesel0.002746706
CA Gasoline0.002312938
2020-21CA Diesel0.003048284
CA Gasoline0.00256689
2019-20CA Diesel0.002651169
CA Gasoline0.002232489
2018-19CA Diesel0.002581641
CA Gasoline0.002173941
2017-18CA Diesel0.002028457
CA Gasoline0.001708117
2016-17CA Diesel0.001518102
CA Gasoline0.00127836
2015-16CA Diesel0.001505783
CA Gasoline / CARBOB0.001292615
2014-15CA Diesel0.00120855
CA Gasoline / CARBOB0.00103746
2013-14CA Diesel0.0014442
CA Gasoline / CARBOB0.00123985
2012-13CA Diesel0.0017928
CA Gasoline / CARBOB0.001539
2011-12CA Diesel0.0016932
CA Gasoline / CARBOB0.0014535
2010-11CA Diesel0.00170316
CA Gasoline / CARBOB0.00146205

Transportation Fuel Emission Factors

Transportation fuels such as CA Diesel, CA Gasoline, and CARBOB that are produced in California or imported into California are subject to the Fee Regulation.

Fuel TypeEmission Factor
CA Diesel0.010236952 (MTCO2e / gallon) or 0.429952 (MTCO2e / bbl)
CA Gasoline / CARBOB0.008620302 (MTCO2e / gallon) or 0.3620527 (MTCO2e / bbl)