Natural Gas Laws and Incentives in Connecticut

The list below contains summaries of all Connecticut laws and incentives related to natural gas.

Laws and Regulations

Alternative Fuel Vehicle (AFV) Procurement Preference

In determining the lowest responsible qualified bidder for the award of state contracts, the Connecticut Department of Administrative Services may give a price preference of up to 10% for the purchase of AFVs or for the purchase of conventional vehicles plus the conversion equipment to convert the vehicles to dual or dedicated alternative fuel use. For these purposes, alternative fuels are natural gas, hydrogen, propane, or electricity used to operate a motor vehicle. (Reference Connecticut General Statutes 4a-59)

Alternative Fuel and Fuel-Efficient Vehicle Acquisition and Emissions Reduction Requirements

Cars and light-duty trucks purchased by state agencies must meet the following requirements:

  • Have an average U.S. Environmental Protection Agency estimated fuel economy of at least 40 miles per gallon;
  • Comply with state fleet vehicle acquisition requirements set forth under the Energy Policy Act of 1992 (EPAct); and
  • Obtain the best achievable fuel economy per pound of carbon dioxide emitted for the applicable vehicle classes.
Alternative fuel vehicles (AFVs) that the state purchases to comply with these requirements must be capable of operating on an EPAct-defined alternative fuel that is available in the state.

In addition, all cars and light-duty trucks that the state purchases or leases must be hybrid electric vehicles, plug-in hybrid electric vehicles, or capable of using alternative fuel. All AFVs purchased or leased must be certified to the California Air Resources Board's (ARB) Ultra Low Emission Vehicle II (ULEV II) standard, and all light-duty gasoline vehicles and hybrid electric vehicles the state purchases or leases must be certified, at a minimum, to the California ARB ULEV II standard. The Connecticut Department of Administrative Services must report annually on the composition of the state fleet, including the volume of alternative fuels used.

Vehicles that the Connecticut Department of Public Safety designates as necessary for the Department of Public Safety to carry out its mission are exempt from these provisions.

(Reference Connecticut General Statutes 4a-67d)

Compressed Natural Gas (CNG) and Propane Tax

CNG and propane used in motor vehicles is subject to a state motor fuel tax rate of $0.26 per gasoline gallon equivalent (GGE). For taxation purposes, one GGE is equal to 123.57 standard cubic feet of natural gas and 35.97 cubic feet of propane. For more information, see the Connecticut Department of Revenue Services Special Notice website. (Reference Connecticut General Statutes 12-458)

School Bus Emissions Reduction

Each full-sized school bus with a Model Year (MY) 1994 or newer engine must be equipped with specific emissions control systems, including either: a closed crankcase filtration system and a level 1, level 2, or level 3 device; an engine that the U.S. Environmental Protection Agency (EPA) has certified as meeting MY 2007 emissions standards; or use of compressed natural gas or other alternative fuel that EPA or the California Air Resources Board has certified to reduce particulate matter emissions by at least 85% as compared to ultra-low sulfur diesel fuel. (Reference Connecticut General Statutes 14-164o)

State Incentives

Heavy-Duty Vehicle Emissions Reduction Grants

The Connecticut Department of Energy and Environmental Protection (DEEP) allocates a portion of its designated funds from the Volkswagen (VW) Environmental Mitigation Trust for the replacement or repower of eligible heavy-duty on-road vehicles through its Diesel Emissions Mitigation Program (Program). The Program provides up to 65% of the cost of new diesel or alternative fuel replacements and repowers for eligible public entities. For eligible private entities, the Program provides up to 40% of the cost of a new diesel or alternative fuel repower, up to 25% of the cost of a new diesel or alternative fuel vehicle, up to 60% of the cost of an all-electric repower, and up to 60% of the cost of a new all-electric vehicle and associated charging infrastructure. Vehicles that qualify for replacement or repower include:

Model YearVehicle Type
1992-2009Class 8 Local Freight Trucks and Port Drayage Trucks
1992-2009Class 4-7 Local Freight Trucks
2009 or olderClass 4-8 School Buses, Shuttle Buses, and Transit Buses

For more information, including application periods, see the DEEP VW Grant Information website.

Loans for Residential Charging or Natural Gas Fueling Infrastructure

The Connecticut Green Bank offers Smart-E low-interest loans for Connecticut PEV drivers to purchase Level 2 and DC fast electric vehicle supply equipment (EVSE) or natural gas vehicle fueling equipment. To qualify, applicants must own and occupy the residence at which the EVSE or fueling equipment will be installed. For more information, see the Connecticut Green Bank Smart-E Loans website.

More Laws and Incentives

To find laws and incentives for other alternative fuels and advanced vehicles, search all laws and incentives.