Royal Decree 661/2007, which was published on 26 May 2007, regulates the production of electricity under a special regime applicable to electricity produced from renewable energy sources. This royal decree supersedes Royal Decree 436/2004 of March 2004 (see separate entry), establishing new tariffs and premiums for each kind of facility covered and incorporating renewable energy, waste to energy, hybrid systems and cogeneration plants into the special regime. (For more detail, see reference below.) IEA/IRENA Global Renewable Energy Policies and Measures Database © OECD/IEA and IRENA, [November 2020]