Which energy source would provide the cheapest electricity for a factory?

solar panels

wind turbines

gas generators

a hydroelectric plant

Option C

Explanation:

Solar energy, wind energy and hydroelectric energy are all renewable source of energy which can be used and created again and again. Hence, if once established these energy sources will become cost effective in long run. However, in case of instant cheap source of energy gas generator is the best option among all. Renewable source of energy cannot be cost effective instantly as they require large set up which in turn require large funding's.

Hence, option C is correct