{
  "url": "https://openlegislation.uk/eu-regulation-2014-548/annex-I/division-2",
  "json_url": "https://openlegislation.uk/eu-regulation-2014-548/annex-I/division-2.json",
  "legislation": "eur/2014/548",
  "legislation_title": "Commission Regulation (EU) No 548/2014 of 21 May 2014 on implementing Directive 2009/125/EC of the European Parliament and of the Council with regard to small, medium and large power transformers",
  "legislation_url": "https://openlegislation.uk/eu-regulation-2014-548",
  "path": "annex/I/division/2",
  "kind": "division",
  "number": "2",
  "heading": "Minimum energy efficiency requirements for large power transformers",
  "text": "Minimum efficiency requirements for large power transformers are set out in Tables I.7, I.8 and I.9.\nThere may be specific instances where the replacement of an existing transformer, or the installation of a new one, meeting the applicable minimum requirements set out in Tables I.7, I.8 and I.9 would result in disproportionate costs. As general rule, costs can be considered to be disproportionate when the extra transportation and/or installation costs of a Tier 2 or Tier 1, as applicable, compliant transformer would be higher than the net present value of the additional avoided electricity losses (tariffs, taxes and levies excluded) over its normally expected service life. This net present value shall be calculated based on capitalised loss values using widely accepted social discount rates .\nIn those cases, the following fall-back provisions apply:\nAs of the date of application of Tier 2 requirements ( 1 July 2021 ), when the one-to-one replacement of a large power transformers in an existing site entails disproportionate costs associated to its transportation and/or installation, or is technically infeasible, the replacement transformer is, exceptionally, only required to comply with Tier 1 requirements for the given rated power.\nFurthermore, if the cost of installing a replacement transformer complying with Tier 1 requirements are also disproportionate, or where no technically feasible solutions exist, no minimum requirements shall apply to the replacement transformer.\nAs of the date of application of Tier 2 requirements ( 1 July 2021 ), when the installation of a new large power transformer in a new site entails disproportionate costs associated to their transportation and/or installation, or is technically infeasible, the new transformer is, exceptionally, only required to meet Tier 1 requirements for the given rated power.\nIn these cases, the manufacturer, importer or authorised representative responsible for placing on the market or putting into service the transformer shall:\ninclude in the technical documentation of the new or replacement transformer the following information:\naddress and contact details of the commissioner of the transformer,\nthe specific location where the transformer is to be installed,\nthe technical and/or economic justification to install a new or replacement transformer that does not comply with Tier 2 or Tier 1 requirements. If the transformer(s) were commissioned by a tendering process, all the necessary information regarding the analysis of bids and the award decision, shall also be provided,\nnotify the competent national market surveillance authorities.\nTable I.7\nMinimum Peak Efficiency Index requirements for liquid immersed large power transformers\nRated Power (MVA)\nTier 1 ( 1.7.2015 )\nTier 2 ( 1.7.2021 )\nMinimum Peak Efficiency Index (%)\n≤ 0,025\n97,742\n98,251\n0,05\n98,584\n98,891\n0,1\n98,867\n99,093\n0,16\n99,012\n99,191\n0,25\n99,112\n99,283\n0,315\n99,154\n99,320\n0,4\n99,209\n99,369\n0,5\n99,247\n99,398\n0,63\n99,295\n99,437\n0,8\n99,343\n99,473\n1\n99,360\n99,484\n1,25\n99,418\n99,487\n1,6\n99,424\n99,494\n2\n99,426\n99,502\n2,5\n99,441\n99,514\n3,15\n99,444\n99,518\n4\n99,465\n99,532\n5\n99,483\n99,548\n6,3\n99,510\n99,571\n8\n99,535\n99,593\n10\n99,560\n99,615\n12,5\n99,588\n99,640\n16\n99,615\n99,663\n20\n99,639\n99,684\n25\n99,657\n99,700\n31,5\n99,671\n99,712\n40\n99,684\n99,724\n50\n99,696\n99,734\n63\n99,709\n99,745\n80\n99,723\n99,758\n100\n99,737\n99,770\n125\n99,737\n99,780\n160\n99,737\n99,790\n≥ 200\n99,737\n99,797\nMinimum PEI values for MVA ratings that fall in between the ratings given in Table I.7 shall be calculated by linear interpolation\nTable I.8\nMinimum Peak Efficiency Index requirements for dry-type large power transformers with Um ≤ 36kV\nRated Power (MVA)\nTier 1 ( 1.7.2015 )\nTier 2 ( 1.7.2021 )\nMinimum Peak Efficiency Index (%)\n3,15 < Sr ≤ 4\n99,348\n99,382\n5\n99,354\n99,387\n6,3\n99,356\n99,389\n8\n99,357\n99,390\n≥ 10\n99,357\n99,390\nMinimum PEI values for MVA ratings that fall in between the ratings given in Table I.8 shall be calculated by linear interpolation\nTable I.9\nMinimum Peak Efficiency Index requirements for dry-type large power transformers with Um > 36kV\nRated Power (MVA)\nTier 1 ( 1.7.2015 )\nTier 2 ( 1.7.2021 )\nMinimum Peak Efficiency Index (%)\n≤ 0,05\n96,174\n96,590\n0,1\n97,514\n97,790\n0,16\n97,792\n98,016\n0,25\n98,155\n98,345\n0,4\n98,334\n98,570\n0,63\n98,494\n98,619\n0,8\n98,677\n98,745\n1\n98,775\n98,837\n1,25\n98,832\n98,892\n1,6\n98,903\n98,960\n2\n98,942\n98,996\n2,5\n98,933\n99,045\n3,15\n99,048\n99,097\n4\n99,158\n99,225\n5\n99,200\n99,265\n6,3\n99,242\n99,303\n8\n99,298\n99,356\n10\n99,330\n99,385\n12,5\n99,370\n99,422\n16\n99,416\n99,464\n20\n99,468\n99,513\n25\n99,521\n99,564\n31,5\n99,551\n99,592\n40\n99,567\n99,607\n50\n99,585\n99,623\n≥ 63\n99,590\n99,626\nMinimum PEI values for MVA ratings that fall in between the ratings given in Table I.9 shall be calculated by linear interpolation.",
  "extent": "E+W+S+N.I.",
  "status": null,
  "version": "current",
  "annotations": [
    {
      "type": "F",
      "label": "F1",
      "text": "Substituted by Commission Regulation (EU) 2019/1783 of 1 October 2019 amending Regulation (EU) No 548/2014 on implementing Directive 2009/125/EC of the European Parliament and of the Council with regard to small, medium and large power transformers (Text with EEA relevance)."
    },
    {
      "type": "footnote",
      "label": "f1",
      "text": "The European Commission Better Regulation Toolbox suggest using a value of 4 % for the social discount rate https://ec.europa.eu/info/sites/info/files/file_import/better-regulation-toolbox-61_en_0.pdf"
    }
  ],
  "outstanding_effects": [],
  "provenance": {
    "source": "legislation.gov.uk",
    "source_url": "https://www.legislation.gov.uk/eur/2014/548/annex/I/division/2",
    "retrieved_at": "2026-11-01T14:47:38.642843+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."
}