{
  "url": "https://openlegislation.uk/eu-regulation-2017-1485/article-108",
  "json_url": "https://openlegislation.uk/eu-regulation-2017-1485/article-108.json",
  "legislation": "eur/2017/1485",
  "legislation_title": "Commission Regulation (EU) 2017/1485 of 2 August 2017 establishing a guideline on electricity transmission system operation (Text with EEA relevance)",
  "legislation_url": "https://openlegislation.uk/eu-regulation-2017-1485",
  "path": "article/108",
  "kind": "article",
  "number": "108",
  "heading": "Ancillary services",
  "text": "1. Each TSO shall monitor the availability of ancillary services.\n2. With regard to active power and reactive power services, and endeavouring to do so in coordination with neighbouring TSOs where appropriate, each TSO shall:\n(a) design, set up and manage the procurement of ancillary services;\n(b) monitor, on the basis of data provided pursuant to Title 2 of Part II, whether the level and location of available ancillary services allows ensuring operational security; and\n(c) use all available economically efficient and feasible means to procure the necessary level of ancillary services.\n3. Each TSO shall publish the levels of reserve capacity necessary to maintain operational security.\n4. Each TSO shall communicate the available level of active power reserves to other TSOs upon request.",
  "extent": "E+W+S+N.I.",
  "status": null,
  "version": "current",
  "annotations": [
    {
      "type": "F",
      "label": "F1",
      "text": "Words in Art. 108(2) inserted (E.W.S.) (31.12.2020) by The Electricity Network Codes and Guidelines (System Operation and Connection) (Amendment etc.) (EU Exit) Regulations 2019 (S.I. 2019/533), reg. 1(2), Sch. 1 para. 73(2)(a) (as amended by S.I. 2020/1016, regs. 1(2), 6(2)); 2020 c. 1, Sch. 5 para. 1(1)"
    },
    {
      "type": "F",
      "label": "F2",
      "text": "Word in Art. 108(2) substituted (E.W.S.) (31.12.2020) by The Electricity Network Codes and Guidelines (System Operation and Connection) (Amendment etc.) (EU Exit) Regulations 2019 (S.I. 2019/533), reg. 1(2), Sch. 1 para. 73(2)(b) (as amended by S.I. 2020/1016, regs. 1(2), 6(2)); 2020 c. 1, Sch. 5 para. 1(1)"
    }
  ],
  "outstanding_effects": [],
  "provenance": {
    "source": "legislation.gov.uk",
    "source_url": "https://www.legislation.gov.uk/eur/2017/1485/article/108",
    "retrieved_at": "2026-11-01T14:44:42.168103+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."
}