rooftop solar

A coalition of 18 California legislators has formally urged the California Public Utilities Commission (CPUC) to enforce regulations under “Rule 21” regarding the interconnection of customer-sited solar and energy storage systems.

Latest boiler upgrade scheme (BUS) data reveals more than 100,000 applications for heat pump grants have been made since support scheme launched in May 2022. Demand has significantly increased in 2025, and the scheme was expanded in early November to include an air-to-air heat pump grant.

The Norwegian industrial heat pump specialist said its HoegTemp system has a heat supply capacity of 0.2 MW to 5 MW and a coefficient of performance above 2 at high lifts.

Heritage buildings face mounting pressure to cut carbon emissions, but traditional solar panels often clash with their historic appearance and face public resistance. Building-integrated photovoltaics (BIPV) offer a discreet alternative, blending solar technology into roofing materials and enabling wider adoption across protected sites. As UK policy increasingly supports solar on historic buildings, BIPV presents a scalable solution that reconciles climate action with architectural preservation.

In a new weekly update for pv magazine, Solcast, a DNV company, reports that Storm Claudia significantly reduced daily irradiance across the British Isles and the Iberian Peninsula, limiting solar generation.

Enowatt says its modular, demountable photovoltaic structures allow companies to deploy solar capacity on existing sites without major building reinforcement, using ballasted units that install directly on asphalt.

Spanish manufacturer Sumcab says its new ToughGround and Overground cables are designed for underground and overhead photovoltaic systems throughout the world, offering durability, rapid installation, and a 30-year lifespan.

Italian research agency Enea has created a web tool that assesses the feasibility of replacing residential gas boilers with heat pumps by providing an estimate of the potential energy and economic savings. The app also provides information on the technical specifications of the photovoltaic system necessary to meet the heat pump’s electricity demand.

The new 12.5 kWh pack-based design supports flexible configuration up to 250 kWh per system. An optional long-duration combiner box supports 2–4 clusters, expandable to 1,000 kWh and 8 hours of storage.

The 6.55 MW project, hailed as the world’s first grid-connected, solar rooftop project within a social housing community, equipped almost 2,000 houses with solar panels.