Regulation 2(1)
The carrying out of development to provide any of the following—
(1) nuclear generating station or other nuclear reactors (except research installation for the production and conversion of fissionable and fertile materials, whose maximum power does not exceed 1 kilowatt continuous thermal load);
(2) thermal generating station with a heat output of 300 megawatts or more;
(3) construction of overhead electrical power lines with a voltage of 220 kilovolts or more and a length of more than 15 kilometres; or
(4) any change to or extension (including a change in the manner or period of operation) of development listed in paragraphs (1) to (3) of this schedule where such a change or extension in itself meets the thresholds, if any, or description of development set out in this schedule.