Question

using co - generation to create electricity can help improve efficiency in power plants to as high as which of these? 90% 10% 25%

Explanation:

Cogeneration (combined heat and power, CHP) systems are known to significantly increase power plant efficiency. Typical power plants without cogeneration have lower efficiencies, but cogeneration can utilize waste heat, raising efficiency to around 90% (compared to much lower for non - cogeneration, and 10% or 25% are too low for cogeneration - enhanced efficiency).

Answer:

90%