London's Green Push Gains Momentum: What Happened This Week on Climate and Sustainability

City Hall confirmed Thursday that the Greater London Authority has awarded a £47 million contract to retrofit 1,200 social housing blocks across nine boroughs with rooftop solar panels, heat pumps and improved insulation — the single largest green-building programme Sadiq Khan's administration has announced since his third term began. Work is scheduled to begin in Lewisham and Southwark by September, with Hackney, Tower Hamlets and Barking and Dagenham following before the end of the year.

The timing matters. France recorded more than 2,000 excess deaths during its recent heatwave peak, and the broader European summer is running dangerously hot. London's average July temperature has climbed 1.8 degrees Celsius above the 1990 baseline, according to the UK Met Office's most recent urban heat island analysis, and the NHS is already reporting a 34 per cent spike in heat-related emergency admissions at King's College Hospital compared with the same week last year. Making housing stock more thermally resilient is no longer an abstract policy goal — it is, borough councillors argue, a public health emergency dressed up as a planning question.

Solar Contracts and the Thames Tidal Question

The retrofit contract sits inside the GLA's expanded Warmer Homes programme, which Labour used as a flagship commitment going into the 2025 local elections. Under the scheme, qualifying households — those in Energy Performance Certificate bands D through G — pay nothing upfront; costs are recovered over 25 years through a small charge on energy bills. The GLA estimates average savings of £640 per household annually once installations are complete. Critics from the London Assembly's Conservative group questioned this week whether the borough rollout schedule is realistic given the current shortage of accredited heat-pump installers across the capital, which stood at roughly 1,100 registered engineers as of May, according to the Microgeneration Certification Scheme's London register.

Separately, Transport for London published a progress update on Tuesday confirming that 96 of the 272 bus routes across zones 1 to 3 are now operating fully electric vehicles. The Elizabeth line — which already runs on 100 per cent renewable-sourced electricity under a contract with EDF signed in 2023 — is being cited internally as a template for extending similar procurement to the Overground network by late 2027. The Stratford and New Cross Gate depots are earmarked for electric-vehicle charging infrastructure upgrades worth a combined £31 million under TfL's Capital Investment Programme.

On the river, the Tideway Tunnel project — the 25-kilometre super-sewer running beneath the Thames from Acton in the west to Beckton in the east — remains on track for its commissioning date, now confirmed as early 2027 after earlier delays. Thames Water, which holds the operational licence despite its well-publicised financial difficulties, told regulators at Ofwat this week that the tunnel will intercept up to 95 per cent of the raw sewage that currently overflows into the tidal Thames during heavy rainfall events. Environmentalists at Thames21, the river conservation charity based in Rotherhithe, welcomed the confirmation but noted that surface water runoff from roads and rooftops remains almost entirely unaddressed in current planning legislation.

What Londoners Can Expect Next

Khan's office has indicated that a detailed Heat Resilience Strategy for London — covering parks, street trees, green roofs and revised planning rules for new builds — will go out for public consultation in September. The consultation is expected to propose mandatory green-roof requirements for any new commercial building above 1,000 square metres in the Central Activities Zone, which stretches from Paddington to Canary Wharf.

For residents, the most immediate practical step is checking eligibility for the Warmer Homes retrofit scheme through the GLA's online portal, which the authority says has already received 18,000 applications since reopening in June. Borough-level assessors are prioritising households with children under five and residents over 65, particularly in areas where the urban heat island effect is most acute — parts of Elephant and Castle, Brixton Road and the lower Lee Valley corridor all rank among the highest-risk postcodes in the GLA's own heat vulnerability index.