{
  "url": "https://openlegislation.uk/eu-decision-2017-1442/annex/division-4/division-4.1/division-4.1.1/division-1",
  "json_url": "https://openlegislation.uk/eu-decision-2017-1442/annex/division-4/division-4.1/division-4.1.1/division-1.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/4.1.1/division/1",
  "kind": "division",
  "number": "BAT 40",
  "heading": "In order to increase the energy efficiency of natural gas combustion, BAT is to use an appropriate combination of the techniques given in BAT 12 and below.",
  "text": "Technique\nDescription\nApplicability\na.\nCombined cycle\nSee description in Section 8.2\nGenerally applicable to new gas turbines and engines except when operated < 1 500 h/yr.\nApplicable to existing gas turbines and engines within the constraints associated with the steam cycle design and the space availability.\nNot applicable to existing gas turbines and engines operated < 1 500 h/yr.\nNot applicable to mechanical drive gas turbines operated in discontinuous mode with extended load variations and frequent start-ups and shutdowns.\nNot applicable to boilers\nTable 23\nBAT-associated energy efficiency levels (BAT-AEELs) for the combustion of natural gas\nThese BAT-AEELs do not apply to units operated < 1 500 h/yr.\nIn the case of CHP units, only one of the two BAT-AEELs ‘Net electrical efficiency’ or ‘Net total fuel utilisation’ applies, depending on the CHP unit design (i.e. either more oriented towards electricity generation or heat generation).\nNet total fuel utilisation BAT-AEELs may not be achievable if the potential heat demand is too low.\nThese BAT-AEELs do not apply to plants generating only electricity.\nThese BAT-AEELs apply to units used for mechanical drive applications.\nThese levels may be difficult to achieve in the case of engines tuned in order to reach NOX levels lower than 190 mg/Nm3.\nType of combustion unit\nBAT-AEELs\nNet electrical efficiency (%)\nNet total fuel utilisation (%)\nNet mechanical energy efficiency (%)\nNew unit\nExisting unit\nNew unit\nExisting unit\nGas engine\n39,5–44\n35–44\n56–85\nNo BAT-AEEL.\nGas-fired boiler\n39–42,5\n38–40\n78–95\nNo BAT-AEEL.\nOpen cycle gas turbine, ≥ 50 MWth\n36–41,5\n33–41,5\nNo BAT-AEEL\n36,5–41\n33,5–41\nCombined cycle gas turbine (CCGT)\nCCGT, 50–600 MWth\n53–58,5\n46–54\nNo BAT-AEEL\nNo BAT-AEEL\nCCGT, ≥ 600 MWth\n57–60,5\n50–60\nNo BAT-AEEL\nNo BAT-AEEL\nCHP CCGT, 50–600 MWth\n53–58,5\n46–54\n65–95\nNo BAT-AEEL\nCHP CCGT, ≥ 600 MWth\n57–60,5\n50–60\n65–95\nNo BAT-AEEL",
  "extent": "E+W+S+N.I.",
  "status": null,
  "version": "current",
  "annotations": [
    {
      "type": "footnote",
      "label": "f1",
      "text": "These BAT-AEELs do not apply to units operated < 1 500 h/yr."
    },
    {
      "type": "footnote",
      "label": "f2",
      "text": "In the case of CHP units, only one of the two BAT-AEELs ‘Net electrical efficiency’ or ‘Net total fuel utilisation’ applies, depending on the CHP unit design (i.e. either more oriented towards electricity generation or heat generation)."
    },
    {
      "type": "footnote",
      "label": "f3",
      "text": "Net total fuel utilisation BAT-AEELs may not be achievable if the potential heat demand is too low."
    },
    {
      "type": "footnote",
      "label": "f4",
      "text": "These BAT-AEELs do not apply to plants generating only electricity."
    },
    {
      "type": "footnote",
      "label": "f5",
      "text": "These BAT-AEELs apply to units used for mechanical drive applications."
    },
    {
      "type": "footnote",
      "label": "f6",
      "text": "These levels may be difficult to achieve in the case of engines tuned in order to reach NOX levels lower than 190 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/4.1.1/division/1",
    "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."
}