Compact Fluorescent Lamps

Compact Fluorescent Lamps (CPL) – A smaller version of standard fluorescent lamps that can directly replace standard incandescent bulbs and reduce the amount of electricity used for lighting by 75% to 80%. These lights consist of a gas filled tube, and a magnetic or electronic ballast.

Composting – The process of degrading organic material (biomass) by microorganisms in aerobic conditions.

Compressed Natural Gas (CNG) – Natural gas (methane) that has been compressed to a higher-pressure gaseous state by a compressor; used in CNG vehicles.

Compression Chiller – A cooling device that uses mechanical energy to produce chilled water.

Cooling Degree Day – A value used to estimate interior air-cooling requirements (load) calculated as the number of degrees per day (over a specified period) that the daily average temperature is above 65 degrees Fahrenheit (or some other, specified base temperature). The daily average temperature is the mean of the maximum and minimum temperatures recorded for a specific location for a 24-hour period.

Controlled Lighting system- An energy saving technique that uses high efficiency fixtures and lamps to minimize energy use for lighting homes, offices and public spaces.

Cooling Pond – A body of water used to cool the water that is circulated in an electric power plant.