{"analytics_identifier":null,"base_path":"/government/publications/strategic-spatial-energy-plan-ssep-timeline-extension","content_id":"22b98d48-1467-4f25-85ba-d4ad663b05ce","description":"Letter to the National Energy System Operator (NESO) on extending the SSEP timeline to integrate updated data, ensuring a stronger, more credible energy plan.","details":{"attachments":[{"accessible":true,"alternative_format_contact_email":"alt.formats@energysecurity.gov.uk","assets":[{"asset_manager_id":"693156a55b5198836f304022","filename":"SSEP-timings-letter-to-NESO.pdf"}],"attachment_type":"file","command_paper_number":"","content_type":"application/pdf","file_size":143813,"filename":"SSEP-timings-letter-to-NESO.pdf","hoc_paper_number":"","id":"9572503","isbn":"","number_of_pages":2,"title":"SSEP timeline extension: letter to NESO","unique_reference":"","unnumbered_command_paper":false,"unnumbered_hoc_paper":false,"url":"https://assets.publishing.service.gov.uk/media/693156a55b5198836f304022/SSEP-timings-letter-to-NESO.pdf"}],"body":"<div class=\"govspeak\"><p>This letter provides an update on the Strategic Spatial Energy Plan (<abbr title=\"Strategic Spatial Energy Plan\">SSEP</abbr>) being developed by <abbr title=\"National Energy System Operator\">NESO</abbr>. It explains why updated cost and demand data are being incorporated into the modelling process to ensure accuracy and transparency.</p>\n\n<p>As a result, the timeline for completing the <abbr title=\"Strategic Spatial Energy Plan\">SSEP</abbr> has been extended. The purpose of this update is to maintain the quality and credibility of the plan while aligning with the latest available information.</p>\n\n<p>The formal deadline to submit the <abbr title=\"Strategic Spatial Energy Plan\">SSEP</abbr> has now been extended to 31 December 2027 and this has been confirmed with a <a href=\"https://www.gov.uk/government/publications/strategic-spatial-energy-plan-deadline-extension\">letter to <abbr title=\"National Energy System Operator\">NESO</abbr></a>.</p>\n\n</div>","change_history":[{"note":"Page updated to add details of deadline extension.","public_timestamp":"2026-10-23T10:05:02Z"},{"note":"First published.","public_timestamp":"2025-12-04T13:16:00Z"}],"document_type_label":"Correspondence","emphasised_organisations":["6315817c-ef11-4905-bb4d-b6dca8e9052c"],"featured_attachments":["9572503"],"first_public_at":"2025-12-04T13:16:00.000+00:00","political":false,"tags":{"browse_pages":[]}},"document_type":"correspondence","first_published_at":"2025-12-04T13:16:00+00:00","links":{"available_translations":[{"api_path":"/api/content/government/publications/strategic-spatial-energy-plan-ssep-timeline-extension","api_url":"https://www.gov.uk/api/content/government/publications/strategic-spatial-energy-plan-ssep-timeline-extension","base_path":"/government/publications/strategic-spatial-energy-plan-ssep-timeline-extension","content_id":"22b98d48-1467-4f25-85ba-d4ad663b05ce","document_type":"correspondence","links":{},"locale":"en","public_updated_at":"2026-10-23T10:05:02Z","schema_name":"publication","title":"Strategic Spatial Energy Plan (SSEP): timeline extension","web_url":"https://www.gov.uk/government/publications/strategic-spatial-energy-plan-ssep-timeline-extension","withdrawn":false}],"government":[{"api_path":"/api/content/government/2024-starmer-labour-government","api_url":"https://www.gov.uk/api/content/government/2024-starmer-labour-government","base_path":"/government/2024-starmer-labour-government","content_id":"9dbff654-cdeb-4ebe-9a12-cd4cc20a033e","details":{"current":false,"ended_on":"2026-07-20T00:00:00+00:00","started_on":"2024-07-05T00:00:00+00:00"},"document_type":"government","links":{},"locale":"en","title":"2024 to 2026 Starmer Labour government","web_url":"https://www.gov.uk/government/2024-starmer-labour-government"}],"organisations":[{"analytics_identifier":"D1380","api_path":"/api/content/government/organisations/department-for-energy-security-and-net-zero","api_url":"https://www.gov.uk/api/content/government/organisations/department-for-energy-security-and-net-zero","base_path":"/government/organisations/department-for-energy-security-and-net-zero","content_id":"6315817c-ef11-4905-bb4d-b6dca8e9052c","details":{"acronym":"DESNZ","brand":"department-for-energy-security-net-zero","default_news_image":{"high_resolution_url":"https://assets.publishing.service.gov.uk/media/656df1fd1104cf000dfa74a1/s960_whitehall-place-exterior-960x640.jpg","url":"https://assets.publishing.service.gov.uk/media/656df1fd0f12ef07a53e01be/s300_whitehall-place-exterior-960x640.jpg"},"logo":{"crest":"single-identity","formatted_title":"Department for<br/>Energy Security<br/>&amp; 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