London Underground has called tenders for a long-term contract for the supply of electricity from renewable sources, as part of a wider scheme for the Greater London Authority group to move to renewable energy by 2030.
Transport for London as a whole uses around 1·6 TWh/year, which is currently sourced directly from the National Grid via the Crown Commercial Service. The initial London Underground renewable power contract, called PPA Comet, is expected to cover the supply of 150-200 GWh/year for 15 years, starting between June 2024 and June 2026.
The electricity would be bought through a power purchase agreement, a long-term contract with a generator which would provide TfL with cost certainty by reducing exposure to changes in the wholesale energy market and which would guarantee the use of renewable sources, rather than a mix of power generators.