This page explores how much onshore wind Great Britain could host, and how that changes with policy decisions. It covers existing and future onshore wind.

Land where wind could never be built is removed first: low wind speeds, steep slopes, proximity to airports, roads, railways and overhead lines, forest, water and public green space. You then choose which further constraints to apply, and how strictly to apply them.

Capacity is not an area multiplied by an assumed power density. Turbines are actually placed on the land that survives — 5 MW machines on a 150 m rotor, spaced five rotor diameters apart — then grouped into farms, with lone machines discarded.