A new Royal Decree RD436/2004 gives a very favourable feed-in tariff of 0,4 EUR/kWh for plants of less than 100 kW, guaranteed for 25 years from the date of commissioning. Despite the favourable buy-back rate, an investment grant of around 40 % is needed to achieve the 10 year payback deemed acceptable for a typical household system. Grants of 30 % or more are now available in many regions of the country.

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