The date and means to fully decarbonise the Whitehall Boiler System are not currently known, as the next phase (Phase 2) of the project to reduce carbon emissions / decarbonise is currently undergoing a feasibility / options appraisal and is anticipated to be the subject of an investment decision as part of the next spending review (SR).
Phase 1 includes installation of pipework lagging (completed 2021/22) and replacing heat exchangers to lower the operating temperature (to be completed from 2022/23). Phase 1 will result in a carbon saving of approximately 17%.
Phase 2 is anticipated to run from 2024 to 2028 and include delivery of Ground Source Heat Pumps to achieve carbon savings of approximately 71% (including Phase 1 carbon savings).
Phase 3 is a further potential scheme that could connect into a wider district heating system anticipated from 2026 to 2035. Phase 3 could achieve carbon savings of approximately 92% (against current emissions).