Germany, which has the strongest government environmental subsidies to promote solar energy, passed legislation in 2001 which required utility companies to purchase unused electrical power from members of the public who installed solar-based power generation equipment at prices four times higher than the general market, with purchase guarantees extending for 20 years.
就政府環保補貼政策而言，以推動太陽能最著力的德國來說，在 2001 年時，德國國會立法，以高於一般市電 4 倍的優惠價格，向裝有太陽能發電設備的民眾買回多餘電力，而且保證收購 20 年。