Welsh residents have access to additional support beyond the UK-wide ECO4 scheme:
Warm Homes Programme (Nest replacement) — Running to April 2031, this Welsh Government scheme can include free solar PV and battery storage for eligible low-income households. Solar PV made up 18.3% of measures installed under the previous Nest scheme. Eligibility is based on household income, property EPC rating, and benefits status.
Green Homes Wales — Interest-free loans of up to £25,000 for renewable energy upgrades. The 2025/26 budget of £3 million limits coverage to approximately 120 households, so apply early. Covers solar PV, battery storage, heat pumps, and insulation.
Wales has the UK's cheapest solar installation costs at £1,508 per kW (MCS data) — 5% below the English average. South Wales (Cardiff, Swansea, Newport, Bridgend) achieves solar yields of 900-1,050 kWh/kWp, comparable to the English Midlands. North Wales (Conwy, Gwynedd, Anglesey) achieves 850-950 kWh/kWp — still economically strong with a payback period of 8-10 years.
For current pricing see our UK cost guide. For battery storage costs, see the dedicated guide — adding a battery significantly improves self-consumption and financial returns.