{
  "url": "https://openlegislation.uk/eu-decision-2017-1442/annex/division-4/division-4.1/division-4.1.2/division-4",
  "json_url": "https://openlegislation.uk/eu-decision-2017-1442/annex/division-4/division-4.1/division-4.1.2/division-4.json",
  "legislation": "eudn/2017/1442",
  "legislation_title": "Commission Implementing Decision (EU) 2017/1442 of 31 July 2017 establishing best available techniques (BAT) conclusions, under Directive 2010/75/EU of the European Parliament and of the Council, for large combustion plants (notified under document C(2017) 5225) (Text with EEA relevance)",
  "legislation_url": "https://openlegislation.uk/eu-decision-2017-1442",
  "path": "annex/division/4/division/4.1/division/4.1.2/division/4",
  "kind": "division",
  "number": "BAT 44",
  "heading": "In order to prevent or reduce CO emissions to air from the combustion of natural gas, BAT is to ensure optimised combustion and/or to use oxidation catalysts.",
  "text": "Table 24\nBAT-associated emission levels (BAT-AELs) for NOX emissions to air from the combustion of natural gas in gas turbines\nThese BAT-AELs also apply to the combustion of natural gas in dual-fuel-fired turbines.\nIn the case of a gas turbine equipped with DLN, these BAT-AELs apply only when the DLN operation is effective.\nThese BAT-AELs do not apply to existing plants operated < 1 500 h/yr.\nOptimising the functioning of an existing technique to reduce NOX emissions further may lead to levels of CO emissions at the higher end of the indicative range for CO emissions given after this table.\nThese BAT-AELs do not apply to existing turbines for mechanical drive applications or to plants operated < 500 h/yr.\nFor plants with a net electrical efficiency (EE) greater than 39 %, a correction factor may be applied to the higher end of the range, corresponding to [higher end] × EE/39, where EE is the net electrical energy efficiency or net mechanical energy efficiency of the plant determined at ISO baseload conditions.\nThe higher end of the range is 80 mg/Nm3 in the case of plants which were put into operation no later than 27 November 2003 and are operated between 500 h/yr and 1 500 h/yr.\nFor plants with a net electrical efficiency (EE) greater than 55 %, a correction factor may be applied to the higher end of the BAT-AEL range, corresponding to [higher end] × EE/55, where EE is the net electrical efficiency of the plant determined at ISO baseload conditions.\nFor existing plants put into operation no later than 7 January 2014, the higher end of the BAT-AEL range is 65 mg/Nm3.\nFor existing plants put into operation no later than 7 January 2014, the higher end of the BAT-AEL range is 55 mg/Nm3.\nFor existing plants put into operation no later than 7 January 2014, the higher end of the BAT-AEL range is 80 mg/Nm3.\nThe lower end of the BAT-AEL range for NOX can be achieved with DLN burners.\nThese levels are indicative.\nFor existing plants put into operation no later than 7 January 2014, the higher end of the BAT-AEL range is 60 mg/Nm3.\nFor existing plants put into operation no later than 7 January 2014, the higher end of the BAT-AEL range is 65 mg/Nm3.\nType of combustion plant\nCombustion plant total rated thermal input(MWth)\nBAT-AELs (mg/Nm3)\nYearly average\nDaily average or average over the sampling period\nOpen-cycle gas turbines (OCGTs)\nNew OCGT\n≥ 50\n15–35\n25–50\nExisting OCGT (excluding turbines for mechanical drive applications) — All but plants operated < 500 h/yr\n≥ 50\n15–50\n25–55\nCombined-cycle gas turbines (CCGTs)\nNew CCGT\n≥ 50\n10–30\n15–40\nExisting CCGT with a net total fuel utilisation of < 75 %\n≥ 600\n10–40\n18–50\nExisting CCGT with a net total fuel utilisation of ≥ 75 %\n≥ 600\n10–50\n18–55\nExisting CCGT with a net total fuel utilisation of < 75 %\n50–600\n10–45\n35–55\nExisting CCGT with a net total fuel utilisation of ≥ 75 %\n50–600\n25–50\n35–55\nOpen- and combined-cycle gas turbines\nGas turbine put into operation no later than 27 November 2003, or existing gas turbine for emergency use and operated < 500 h/yr\n≥ 50\nNo BAT-AEL\n60–140\nExisting gas turbine for mechanical drive applications — All but plants operated < 500 h/yr\n≥ 50\n15–50\n25–55\nAs an indication, the yearly average CO emission levels for each type of existing combustion plant operated ≥ 1 500 h/yr and for each type of new combustion plant will generally be as follows:\nNew OCGT of ≥ 50 MWth: < 5–40 mg/Nm3. For plants with a net electrical efficiency (EE) greater than 39 %, a correction factor may be applied to the higher end of this range, corresponding to [higher end] × EE/39, where EE is the net electrical energy efficiency or net mechanical energy efficiency of the plant determined at ISO baseload conditions.\nExisting OCGT of ≥ 50 MWth (excluding turbines for mechanical drive applications): < 5–40 mg/Nm3. The higher end of this range will generally be 80 mg/Nm3 in the case of existing plants that cannot be fitted with dry techniques for NOX reduction, or 50 mg/Nm3 for plants that operate at low load.\nNew CCGT of ≥ 50 MWth: < 5–30 mg/Nm3. For plants with a net electrical efficiency (EE) greater than 55 %, a correction factor may be applied to the higher end of the range, corresponding to [higher end] × EE/55, where EE is the net electrical energy efficiency of the plant determined at ISO baseload conditions.\nExisting CCGT of ≥ 50 MWth: < 5–30 mg/Nm3. The higher end of this range will generally be 50 mg/Nm3 for plants that operate at low load.\nExisting gas turbines of ≥ 50 MWth for mechanical drive applications: < 5–40 mg/Nm3. The higher end of the range will generally be 50 mg/Nm3 when plants operate at low load.\nIn the case of a gas turbine equipped with DLN burners, these indicative levels correspond to when the DLN operation is effective.\nTable 25\nBAT-associated emission levels (BAT-AELs) for NOX emissions to air from the combustion of natural gas in boilers and engines\nOptimising the functioning of an existing technique to reduce NOX emissions further may lead to levels of CO emissions at the higher end of the indicative range for CO emissions given after this table.\nThese BAT-AELs do not apply to plants operated < 1 500 h/yr.\nFor plants operated < 500 h/yr, these levels are indicative.\nThese BAT-AELs only apply to spark-ignited and dual-fuel engines. They do not apply to gas-diesel engines.\nIn the case of engines for emergency use operated < 500 h/yr that could not apply the lean-burn concept or use SCR, the higher end of the indicative range is 175 mg/Nm3.\nType of combustion plant\nBAT-AELs (mg/Nm3)\nYearly average\nDaily average or average over the sampling period\nNew plant\nExisting plant\nNew plant\nExisting plant\nBoiler\n10–60\n50–100\n30–85\n85–110\nEngine\n20–75\n20–100\n55–85\n55–110\nAs an indication, the yearly average CO emission levels will generally be:\n< 5–40 mg/Nm3 for existing boilers operated ≥ 1 500 h/yr,\n< 5–15 mg/Nm3 for new boilers,\n30–100 mg/Nm3 for existing engines operated ≥ 1 500 h/yr and for new engines.",
  "extent": "E+W+S+N.I.",
  "status": null,
  "version": "current",
  "annotations": [
    {
      "type": "footnote",
      "label": "f1",
      "text": "These BAT-AELs also apply to the combustion of natural gas in dual-fuel-fired turbines."
    },
    {
      "type": "footnote",
      "label": "f2",
      "text": "In the case of a gas turbine equipped with DLN, these BAT-AELs apply only when the DLN operation is effective."
    },
    {
      "type": "footnote",
      "label": "f3",
      "text": "These BAT-AELs do not apply to existing plants operated < 1 500 h/yr."
    },
    {
      "type": "footnote",
      "label": "f4",
      "text": "Optimising the functioning of an existing technique to reduce NOX emissions further may lead to levels of CO emissions at the higher end of the indicative range for CO emissions given after this table."
    },
    {
      "type": "footnote",
      "label": "f5",
      "text": "These BAT-AELs do not apply to existing turbines for mechanical drive applications or to plants operated < 500 h/yr."
    },
    {
      "type": "footnote",
      "label": "f6",
      "text": "For plants with a net electrical efficiency (EE) greater than 39 %, a correction factor may be applied to the higher end of the range, corresponding to [higher end] × EE/39, where EE is the net electrical energy efficiency or net mechanical energy efficiency of the plant determined at ISO baseload conditions."
    },
    {
      "type": "footnote",
      "label": "f7",
      "text": "The higher end of the range is 80 mg/Nm3 in the case of plants which were put into operation no later than 27 November 2003 and are operated between 500 h/yr and 1 500 h/yr."
    },
    {
      "type": "footnote",
      "label": "f8",
      "text": "For plants with a net electrical efficiency (EE) greater than 55 %, a correction factor may be applied to the higher end of the BAT-AEL range, corresponding to [higher end] × EE/55, where EE is the net electrical efficiency of the plant determined at ISO baseload conditions."
    },
    {
      "type": "footnote",
      "label": "f9",
      "text": "For existing plants put into operation no later than 7 January 2014, the higher end of the BAT-AEL range is 65 mg/Nm3."
    },
    {
      "type": "footnote",
      "label": "f10",
      "text": "For existing plants put into operation no later than 7 January 2014, the higher end of the BAT-AEL range is 55 mg/Nm3."
    },
    {
      "type": "footnote",
      "label": "f11",
      "text": "For existing plants put into operation no later than 7 January 2014, the higher end of the BAT-AEL range is 80 mg/Nm3."
    },
    {
      "type": "footnote",
      "label": "f12",
      "text": "The lower end of the BAT-AEL range for NOX can be achieved with DLN burners."
    },
    {
      "type": "footnote",
      "label": "f13",
      "text": "These levels are indicative."
    },
    {
      "type": "footnote",
      "label": "f14",
      "text": "For existing plants put into operation no later than 7 January 2014, the higher end of the BAT-AEL range is 60 mg/Nm3."
    },
    {
      "type": "footnote",
      "label": "f15",
      "text": "For existing plants put into operation no later than 7 January 2014, the higher end of the BAT-AEL range is 65 mg/Nm3."
    },
    {
      "type": "footnote",
      "label": "f16",
      "text": "Optimising the functioning of an existing technique to reduce NOX emissions further may lead to levels of CO emissions at the higher end of the indicative range for CO emissions given after this table."
    },
    {
      "type": "footnote",
      "label": "f17",
      "text": "These BAT-AELs do not apply to plants operated < 1 500 h/yr."
    },
    {
      "type": "footnote",
      "label": "f18",
      "text": "For plants operated < 500 h/yr, these levels are indicative."
    },
    {
      "type": "footnote",
      "label": "f19",
      "text": "These BAT-AELs only apply to spark-ignited and dual-fuel engines. They do not apply to gas-diesel engines."
    },
    {
      "type": "footnote",
      "label": "f20",
      "text": "In the case of engines for emergency use operated < 500 h/yr that could not apply the lean-burn concept or use SCR, the higher end of the indicative range is 175 mg/Nm3."
    }
  ],
  "outstanding_effects": [],
  "provenance": {
    "source": "legislation.gov.uk",
    "source_url": "https://www.legislation.gov.uk/eudn/2017/1442/annex/division/4/division/4.1/division/4.1.2/division/4",
    "retrieved_at": "2026-11-01T15:13:23.628050+00:00"
  },
  "licence": "Open Government Licence v3.0",
  "licence_url": "https://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/",
  "attribution": "Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives."
}