What is co-generation?

• A. Using energy from only one source.
• B. Storing electrical energy in a battery.
• C. Capturing waste heat and using it for another purpose.
• D. Generating electricity directly from fossil fuels with no heat capture.

Answer: (C)

Co-generation means capturing the heat that would normally be wasted when electricity is produced and using that heat for another purpose, like space heating, hot water, or industrial processes. This approach makes the overall energy use much more efficient because one unit of fuel provides both electrical energy and usable thermal energy. For example, a natural gas plant can run a generator to produce electricity and, instead of letting the exhaust heat go unused, channel that heat into steam or hot water for heating a building or for a manufacturing process. This dual output reduces additional fuel use and cuts emissions compared with producing electricity alone and discarding the heat. It’s not about using only one energy source, storing electricity in a battery, or generating electricity with no heat recovery—that would miss the essential heat-capturing part of the concept.