Article 16 of the 2009 renewable energy directive requires that member states provide either priority or guaranteed access to the grid for connected generators of electricity from renewable energy sources, and priority dispatch for electricity from renewable energy sources, subject to requirements relating to the maintenance of the reliability and safety of the grid.We provide guaranteed access in Great Britain through a market-based approach for all generators connected to the grid, including renewables. As regards priority dispatch, we also have a market-based approach where dispatch depends on the generator meeting a market price. Where it is necessary to prevent access on occasion in order to ensure the reliability and safety of the grid system, our market arrangements determine which generator reduces its output, and these generators are compensated. Our market-based arrangements tend to promote output from renewable generation as it will usually be more cost-effective for conventional generation to reduce its output given that it incurs fuel costs when running.