Which term describes the practice of using waste heat from energy generation to provide heating or cooling for other processes?

• A. Cogeneration
• B. Incineration
• C. Recycling
• D. Waste-to-energy

Answer: (A)

Using heat that would normally be wasted from electricity production to supply heating or cooling for other processes is called cogeneration, also known as combined heat and power. The idea is to pair power generation with heat recovery so a single fuel source delivers both electrical energy and useful thermal energy. This boosts overall efficiency because the heat produced in making electricity is captured and put to work, whether for space heating, process steam, or cooling through absorption chillers. For example, a natural gas-fired turbine can drive a generator while the exhaust heat is used to produce steam for industrial processes or to feed a district heating system. This approach lowers fuel use and emissions compared with generating electricity and heat separately. Incineration, recycling, and waste-to-energy describe other waste management or energy-recovery strategies that don’t specifically focus on using the captured heat for additional processes.