Timeline
Dates are as recorded in the cited documents. “Forecast” means SDEN or the Council expects it, not that it has happened.
Promised v actual dates
Milestone Promised Actual / forecast Gap Sources Phase 1: 800 homes by 2022 (2017 model) July 2023 build-out about 12 months S11 , S3 Lavenders: contracts signed before end Mar 2019 not signed as of Mar 2026 7+ years and continuing S9 , S3 Lavenders: planning application Q1 2025 not submitted as of Mar 2026 12+ months and continuing S7 , S3 Lavenders: heat supply 2025 (DESNZ), end 2025 (brochure), mid 2026 (2025–28 plan) forecast from mid 2027 12–18+ months and continuing S19 , S12 , S7 , S3 ERF heat connection original date not found forecast 1 Apr 2027 n/a S3 , S6
Key dates
23 Feb 2016 SDEN incorporated (Companies House 10022446). Verified
Sources: S1
Sept 2017 First heat supplied to New Mill Quarter from back-up gas boilers. Verified
Sources: S3 , S7
5 Feb 2019 Shareholdings Board paper: extend the network about 700 m to Lavenders; Clarion needed contracts signed before end of March 2019. Verified
Sources: S9
March 2019 Beddington energy recovery facility (ERF) operational. Verified
Sources: S3 , S6
March 2021 Off-site low-carbon (landfill gas) heat effective for the network. Verified
Sources: S3 , S7
Nov 2021 CIPFA review (commissioned by the Council) published to Strategy & Resources Committee; says earlier model assumptions were not prudent. Verified
Sources: S11
July 2023 Full build-out of heat interface units at New Mill Quarter (company plan). Likely
Sources: S3
Q4 2024 Government pipeline lists Lavenders extension: ‘initial heat’ 2025, cost ‘circa £2M’. Verified
Sources: S19
Feb 2025 SDEN brochure says 348 further homes ‘forecasted to complete before the end of 2025’. Verified
Sources: S12
14 Nov 2025 One outage of about 4h15m reported by SDEN (1:30–5:45am). Verified
Sources: S3
27 Jan 2026 Ofgem regulation of heat networks goes live; existing operators must register by 26 Jan 2027. Verified
Sources: S22
10 Mar 2026 Council business plan 2026–29: Lavenders planning application still to be submitted; connection ‘from mid 2027’. Verified
Sources: S3 , S4
1 Apr 2027 Forecast Heat from the ERF (up to 15 MW) forecast to start. Verified
Sources: S3
From mid 2027 Forecast Lavenders connection forecast. Verified
Sources: S3
Date check pending: the date of the 2019 First-tier Tribunal decision on release of the 2017 model review is
being checked against the BAILII record before it is added. Unverified
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