Solar Panels in Portsmouth: Costs, Yields and South Coast Performance

Does solar work in Portsmouth?

Portsmouth is one of the UK's best cities for solar performance. Portsea Island sits at the south-eastern tip of Hampshire, facing the Solent, with excellent sky exposure and some of the highest irradiance levels in England outside Cornwall and Kent.

Annual irradiance runs at around 1,050–1,150 kWh/m², translating to a typical panel yield of 950–1,000 kWh per kWp per year. A 4 kWp south-facing system in Portsmouth generates approximately 3,800–4,000 kWh per year — among the highest for any mainland UK city.

How much does solar cost in Portsmouth?

South coast installation costs are broadly in line with the England average of around £1,591 per kWp. A typical 4 kWp system costs in the range of £5,500–£7,000. The strong yield means the return on investment is faster here than in most of the UK — payback periods of 7–10 years are realistic for a well-specified system.

Your electricity network: SSEN

Portsmouth is served by SSEN — Scottish and Southern Electricity Networks (ssen.co.uk). SSEN covers most of southern England outside London and the South East, as well as northern Scotland.

G98 Fit and Inform notifications (systems up to 3.68 kW per phase) and G99 pre-approvals (larger systems) are submitted by your installer to SSEN. The process is straightforward for standard domestic systems.

Typical system for Portsmouth homes

Portsmouth is a densely built city with a very high proportion of Victorian and Edwardian terraced houses — the naval and dockyard heritage means vast stretches of uniform two-storey terracing, particularly in Southsea, Fratton, and north Portsmouth.

These properties typically accommodate a 3–4 kWp system on the rear roof slope (6–8 panels). The rear-facing slope is usually south or south-west on Portsmouth's typical terrace orientation, which is near-ideal for solar.

Flat-roofed properties and modern estates in areas such as Paulsgrove and Cosham can sometimes accommodate larger systems. Detached and larger semi-detached homes in Drayton and Farlington suit 4–6 kWp.

Local grants and schemes

• ECO4 — available to low-income and vulnerable households UK-wide. Portsmouth has areas of significant deprivation, particularly in north Portsmouth and some inner-city wards, where ECO4 eligibility is higher than average.
• Warm Homes Local Grant — for properties with poor EPC ratings.
• Portsmouth City Council — the council has previously run local energy efficiency programmes; contact their housing team for current referral routes.
• 0% VAT on solar — UK-wide until March 2027.

Planning in Portsmouth

Standard GB permitted development rules apply. Most Portsmouth homes can have solar panels installed without planning permission, subject to the 200 mm maximum projection above the roof plane and restrictions on street-facing elevations in conservation areas.

Portsmouth has several conservation areas, including parts of Southsea and the historic Old Portsmouth area. The old town has a number of listed buildings. If your home is listed or in a conservation area, contact Portsmouth City Council's planning department before proceeding — panels on rear slopes not visible from the street are generally less contentious.

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