The Electricity Act 1989 (Requirement of Consent for Hydro-electric Generating Stations) (Scotland) Order 1990
Section 36 of the Electricity Act 1989 requires the consent of the Secretary of State to construction, extension or operation of an electricity generating station with a capacity exceeding 50 megawatts. The Secretary of State has power to vary this limit, and in doing so may make different provision for generating stations of different classes or descriptions.