NR 440.20(1)(a)2.2. For which construction or modification is commenced after September 18, 1978. NR 440.20(1)(b)(b) Unless and until s. NR 440.50 extends the applicability of s. NR 440.50 to electric utility steam generators, this section applies to electric utility combined cycle gas turbines that are capable of combusting more than 73 megawatts (250 million Btu/hour) heat input of fossil fuel in the steam generator. Only emissions resulting from combustion of fuels in the steam generating unit are subject to this section. NR 440.20 NoteNote: The gas turbine emissions are subject to s. NR 440.50. NR 440.20(1)(c)(c) Any change to an existing fossil-fuel-fired steam generating unit to accommodate the use of combustible materials, other than fossil fuels, will not bring that unit under the applicability of this section. NR 440.20(1)(d)(d) Any change to an existing steam generating unit originally designed to fire gaseous or liquid fossil fuels, to accommodate the use of any other fuel (fossil or nonfossil) will not bring that unit under the applicability of this section. NR 440.20(2)(2) Definitions. As used in this section, terms not defined in this subsection have the meanings given in s. NR 440.02. NR 440.20(2)(a)(a) “24-hour period” means the period of time between 12:01 a.m. and 12:00 midnight. NR 440.20(2)(b)(b) “Anthracite” means coal that is classified as anthracite according to the ASTM Standard Specification for Classification of Coals by Rank, D388-99 (reapproved 2004), incorporated by reference in s. NR 440.17 (2) (a) 12. NR 440.20(2)(c)(c) “Available purchase power” means the lesser of the following: NR 440.20(2)(c)1.1. The sum of available system capacity in all neighboring companies. NR 440.20(2)(c)2.2. The sum of the rated capacities of the power interconnection devices between the principal company and all neighboring companies, minus the sum of the electric power load on these interconnections. NR 440.20(2)(c)3.3. The rated capacity of the power transmission lines between the power interconnection devices and the electric generating units (the unit in the principal company that has the malfunctioning flue gas desulfurization system and the unit or units in the neighboring company supplying replacement electrical power) less the electric power load on these transmission lines. NR 440.20(2)(d)(d) “Available system capacity” means the capacity determined by subtracting the system load and the system emergency reserves from the net system capacity. NR 440.20(2)(e)(e) “Boiler operating day” means a 24-hour period during which fossil fuel is combusted in a steam generating unit for the entire 24 hours. NR 440.20(2)(f)(f) “Coal refuse” means waste products of coal mining, physical coal cleaning, and coal preparation operations (e.g. culm, gob, etc.) containing coal, matrix material, clay, and other organic and inorganic material. NR 440.20(2)(g)(g) “Combined cycle gas turbine” means a stationary turbine combustion system where heat from the turbine exhaust gases is recovered by a steam generating unit. NR 440.20(2)(gr)(gr) “Duct burner” means a device that combusts fuel and that is placed in the exhaust duct from another source, such as a stationary gas turbine, internal combustion engine or kiln, to allow the firing of additional fuel to heat the exhaust gases before the exhaust gases enter a heat recovery steam generating unit. NR 440.20(2)(h)(h) “Electric utility combined cycle gas turbine” means any combined cycle gas turbine used for electric generation that is constructed for the purpose of supplying more than one-third of its potential electric output capacity and more than 25 MW electrical output to any utility power distribution system for sale. Any steam distribution system that is constructed for the purpose of providing steam to a steam-electric generator that would produce electrical power for sale is also considered in determining the electrical energy output capacity of the affected facility. NR 440.20(2)(i)(i) “Electric utility company” means the largest interconnected organization, business or governmental entity that generates electric power for sale (e.g., a holding company with operating subsidiary companies). NR 440.20(2)(j)(j) “Electric utility steam generating unit” means any steam electric generating unit that is constructed for the purpose of supplying more than one-third of its potential electric output capacity and more than 25 MW electrical output to any utility power distribution system for sale. Any steam supplied to a steam distribution system for the purpose of providing steam to a steam-electric generator that would produce electrical energy for sale is also considered in determining the electrical energy output capacity of the affected facility. NR 440.20(2)(k)1.1. The electric generation output of an affected facility with a malfunctioning flue gas desulfurization system cannot be reduced or electrical output must be increased because: NR 440.20(2)(k)1.a.a. All available system capacity in the principal company interconnected with the affected facility is being operated, and NR 440.20(2)(k)1.b.b. All available purchase power interconnected with the affected facility is being obtained, or NR 440.20(2)(k)2.2. The electric generation demand is being shifted as quickly as possible from an affected facility with a malfunctioning flue gas desulfurization system to one or more electrical generating units held in reserve by the principal company or by a neighboring company, or NR 440.20(2)(k)3.3. An affected facility with a malfunctioning flue gas desulfurization system becomes the only available unit to maintain a part or all of the principal company’s system emergency reserves and the unit is operated in spinning reserve at the lowest practical electric generation load consistent with not causing significant physical damage to the unit. If the unit is operated at a higher load to meet load demand, an emergency condition would not exist unless the conditions under subd. 1. apply. NR 440.20(2)(L)(L) “Fossil fuel” means natural gas, petroleum, coal, and any form of solid, liquid or gaseous fuel derived from such material for the purpose of creating useful heat. NR 440.20(2)(Lm)(Lm) “Gross output” means the gross useful work performed by the steam generated. For units generating only electricity, the gross useful work performed is the gross electrical output from the turbine or generator set. For cogeneration units, the gross useful work performed is the gross electrical output plus one half the useful thermal output (that is, steam delivered to an industrial process). NR 440.20(2)(m)(m) “Interconnected” means that 2 or more electric generating units are electrically tied together by a network of power transmission lines, and other power transmission equipment.