Answer to Question #287149 in Physics for !gnorance

Question

A wind turbine can generate 150W on average and costs £3000 to buy and install What is the cost per kWh if the owner wants to pay for the turbine with five year's electricity sales? Give your answer as a number of pence to the nearest penny

Answer 1

Assume 1 kWh costs C. The 0.15 kW turbine must work 5 years, or 5*8760 hours, or 43800 h. Therefore, each year it outputs 0.15*43800=6570 kWh of electrical energy. The cost of 1 kWh should be

$$C=3000/6570=0.45\text{ penny}.$$