The Royal Decree-Act 6/2009, of 30th April, laid down the inception of the Pre-assignment Registry for energy installations belonging to the Special Regime. It also allowed the possibility of establishing a specific schedule aiming to plan and control the commissioning of pre-registered power capacity for those technologies whose installed capacity exceeded the objectives set out by the Spanish Renewable Energy Plan 2005-2010. Accordingly, in this context, the Cabinet of Ministers Ruling in hand set up an organised power plant commissioning calendar for the years to come; focusing on Wind and Solar Thermal Electric renewable energy technologies, and up to the end of 2012 and 2013 respectively. It establishes a power plant commissioning roadmap which allocates an annual average installed capacity slightly higher than 1,700 MW for wind power and 500 MW for solar thermal electric power. The Ruling intends to administer the amount of renewable energy installed so as to offer a sensible apportionment of consumer costs over the years, as well as to provide technical feasibility of renewable energy integration into the electrical grid. At the same time, it minimises uncertainty for the industry and investors, by providing a medium-term foreseeable future, which will assist all involved agents in their business and risk planning. Finally, it represents an important step towards the achievement of the 2020 Spanish mandatory targets regarding the share of renewable energy sources, set in the Directive 2009/28/EC of the European Parliament and of the Council of 23 April 2009.