Burning any fuel in a combustion appliance with a rated thermal input of 50 megawatts or more.
For the purposes of Part A, where two or more appliances with an aggregate rated thermal input of 50 megawatts or more are operated on the same site by the same operator those appliances are be treated as a single appliance with a rated thermal input of 50 megawatts or more.
Unless described in Part A of this section—
(a)Burning any fuel in a boiler or furnace with a rated thermal input of more than 20 megawatts and less than 50 megawatts,
(b)Burning any fuel in a gas turbine or compression ignition engine with a rated thermal input of more than 20 megawatts and less than 50 megawatts.
For the purposes of section 1.1—
“rated thermal input” is the rate at which fuel can be burned at the maximum continuous rating of the appliance multiplied by the net calorific value of the fuel and expressed as megawatts thermal.