{
  "url": "https://openlegislation.uk/environmental-authorisations-scotland-regulations-2018/schedule-21/paragraph-13",
  "json_url": "https://openlegislation.uk/environmental-authorisations-scotland-regulations-2018/schedule-21/paragraph-13.json",
  "legislation": "ssi/2018/219",
  "legislation_title": "The Environmental Authorisations (Scotland) Regulations 2018",
  "legislation_url": "https://openlegislation.uk/environmental-authorisations-scotland-regulations-2018",
  "path": "schedule/21/paragraph/13",
  "kind": "paragraph",
  "number": "13",
  "heading": "Multi-fuel firing combustion plants",
  "text": "(1) SEPA must, except where sub-paragraph (2) applies, set the emissions limit value for a multi-fuel large combustion plant involving the simultaneous use of two or more fuels by—\n(a) taking the emission limit value for each individual fuel and pollutant corresponding to the total rated thermal input of the entire combustion plant as set out in Chapters 1 and 2 of Part 3 of this schedule,\n(b) determining fuel-weighted emission limit values, by multiplying the individual emission limit value in head (a) by the thermal input delivered by each fuel, and dividing the total by the total thermal inputs delivered by all fuels,\n(c) aggregating the fuel-weighted emission limit values.\n(2) This sub-paragraph applies to a multi-fuel large combustion plant covered by paragraph 6(1) of this schedule, which uses the distillation and conversion residues from the refining of crude oil for own consumption, alone or with other fuels.\n(3) Where sub-paragraph (2) applies, the following emission limit values may be set rather than the values set according to sub-paragraph (1)—\n(a) where, during the operation of the combustion plant, the proportion contributed by the determinative fuel to the sum of the thermal inputs delivered by all fuels is 50% or more, the emission limit value set in Chapter 1 of Part 3 of this schedule for the determinative fuel,\n(b) where the proportion contributed by the determinative fuel to the sum of the thermal inputs delivered by all fuels is less than 50%, the emission limit value is determined by—\n(i) taking the emission limit values set out in Chapter 1 of Part 3 of this schedule for each of the fuels used, corresponding to the total rated thermal input of the combustion plant,\n(ii) calculating the emission limit value of the determinative fuel by multiplying the emission limit value, determined for that fuel according to sub-head (i), by a factor of two, and subtracting from this product the emission limit value of the fuel used with the lowest emission limit value as set out in Chapter 1 of Part 3 of this schedule, corresponding to the total rated thermal input of the combustion plant,\n(iii) determining the fuel-weighted emission limit value for each fuel used by multiplying the emission limit value determined under sub-heads (i) and (ii) by the thermal input of the fuel concerned and by dividing the total by the total thermal inputs delivered by all fuels,\n(iv) aggregating the fuel-weighted emission limit values.\n(4) Where a multi-fuel firing large combustion plant to which paragraph 6(1) of this schedule applies uses the distillation and conversion residues from the refining of crude-oil for its own consumption, alone or with other fuels, the average emission limit values for sulphur dioxide set out in Chapter 6 of Part 3 of this schedule may be applied instead of the emission limit values set according to sub-paragraphs (1) or (3) of this paragraph.",
  "extent": null,
  "status": null,
  "version": "current",
  "annotations": [
    {
      "type": "F",
      "label": "F1",
      "text": "Sch. 21 inserted (1.11.2025) by The Environmental Authorisations (Scotland) Amendment Regulations 2025 (S.S.I. 2025/165), reg. 1(2), sch. 12 (with sch. 23)"
    }
  ],
  "outstanding_effects": [],
  "provenance": {
    "source": "legislation.gov.uk",
    "source_url": "https://www.legislation.gov.uk/ssi/2018/219/schedule/21/paragraph/13",
    "retrieved_at": "2026-10-28T21:11:56.403037+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."
}