Using the same subsidy of 15% as the previous question, how many years does system B need to be operational to earn the own investment back (assume that the electricity price of €0.23/kWh does not change)?

Answer 1

Subsidized Price: (0.85)(€0.14379 / kWh) = €0.1222 / kWh
Savings Per kWh: (€0.23 / kWh) - (€0.1222 / kWh) = €0.10778 / kWh
Savings Per Year: (€0.10778 / kWh)(765 kWh / yr) = €82.45 / yr
Years To Regain Investment: (€2200) / (€82.45 / yr) = 26.7 yrs