Fossil Fuels Please select a fossil fuel source to learn more. Standard air conditioning is classified under the fossil fuel technologies because it is not the most efficient cooling technology on the market and usually uses electricity made from non-renewables. Fossil (Natural) Gas Heating Oil Standard Air-Conditioning Calculate the cost of your switch Incentive Information National Grid Block Island Power Company Pascoag Utility District List of qualified contractors RISE – Home Energy Assessment Contact Us Anika Kreckel Thermal Decarbonization Program ManagerAnika.kreckel.ctr@energy.ri.gov