The Idea of Cogeneration Is to Actively Use ________ Electricity

Multiple Choice

The idea of cogeneration is to actively use ________ electricity generating plants.

A) Solar as well as coal energy to produce electricity at
B) Warm water as well as steam to produce electricity at
C) Two kinds of fuel (e.g., coal and oil) at
D) Both electricity and waste steam heat from
E) Two different types of thermal conversion machines for increased efficiency at