Solar Panels for Businesses in Portsmouth

Why solar PV makes sense for Portsmouth businesses

Portsmouth is the South East’s principal naval city and one of England’s most densely-built urban areas — a unique island city with around 8 million square feet of commercial floorspace concentrated between the Historic Dockyard, the city centre and Gunwharf Quays commercial cluster, the Lakeside North Harbour office park at Cosham, and the Airport Industrial and Voyager Park clusters at Hilsea. Portsmouth’s south-coast position gives it one of the strongest commercial solar resources in the UK — typically 1,750 to 1,850 hours of sunshine per year, well above the UK average. The city’s commercial roof estate is a strong fit for PV: large clear-span sheds across Lakeside North Harbour, Voyager Park, and Airport Industrial; modern hospitality buildings at Gunwharf Quays; and a heritage commercial stock around Old Portsmouth and Southsea that requires careful design.

Portsmouth City Council declared a climate emergency in 2019 and committed to a 2030 net zero target through the Portsmouth Climate Emergency Plan — one of the strongest UK city-level commitments. Solent Freeport status, granted in 2022 and covering parts of Portsmouth, Southampton, and the Solent corridor, unlocks Enhanced Capital Allowances for businesses inside the designated zones — meaningful uplift on top of the standard 100% AIA. For commercial property owners and tenants in PO1 through PO6, this means a planning service oriented around supporting renewable energy investment, an active Freeport-driven supply chain, and procurement signals from the council, the Royal Navy, and the major employers that increasingly reward Scope 2 reductions.

Portsmouth’s industrial geography — where solar makes the most sense

Lakeside North Harbour, in the PO6 postcode at Cosham just inside the M27, is Portsmouth’s largest dedicated office and business park. It hosts more than 80 businesses spanning insurance, professional services, technology, and defence headquarters functions, with major tenants including IBM, Siemens, and Capita. Buildings range from 2,000 to 8,000 square metres of post-1990 office construction, with high daytime baseload from IT, HVAC, and lighting. Lakeside North Harbour is one of the strongest single locations for sub-megawatt rooftop PV in coastal Hampshire, and several buildings already have arrays installed.

Voyager Park, also in PO3 at Portsmouth Airport site, is a mixed industrial and trade park hosting motor trade, light industrial, and supply chain businesses. Buildings typically 1,500 to 5,000 square metres, with high daytime baseload. The Airport Industrial Estate, also in PO3, is a heritage industrial site dating from the 1980s and 1990s — most buildings have steel-portal roofs that have been re-roofed across the 2018-2024 period and are PV-ready.

Quartremaine Road, in PO3 alongside Airport Industrial Estate, hosts a mix of light industrial and trade counters with smaller floorplate buildings of 800 to 3,000 square metres — well-suited to 50 to 200 kW PV systems. Walton Road in PO6 is another mid-sized trade and industrial cluster with similar building characteristics.

Beyond the named estates, the Portsmouth Historic Dockyard in PO1 is the city’s largest single commercial energy concentration — the Royal Navy operates a substantial estate here, with BAE Systems, Babcock International, and a long tail of marine engineering and defence supply chain tenants. Several buildings inside the Historic Dockyard are listed and require careful heritage design, but the modern post-2000 buildings are ideal candidates for PV. The University of Portsmouth’s city-centre campus along Cambridge Road and Park Building also drives substantial commercial energy demand and has progressively added rooftop PV across its estate.

Portsmouth City Council’s climate framework and what it means for your project

Portsmouth City Council’s 2030 net zero target is supported by the Portsmouth Climate Emergency Plan with five-year delivery cycles. The plan addresses the council’s own estate of more than 200 buildings and provides policy frameworks supporting private-sector decarbonisation across PO postcodes. For commercial property owners considering solar PV in Portsmouth, three policy elements matter directly:

First, planning. Portsmouth’s planning service treats rooftop solar PV on most commercial buildings as Permitted Development under Class A Part 14 of the GPDO 2015. Portsmouth has substantial conservation areas covering Old Portsmouth, Southsea, parts of the Historic Dockyard, and the Spice Island commercial cluster — these require listed building consent or planning permission. Portsmouth’s heritage planning team has approved arrays on Grade II listed buildings where the design protects principal elevations, including former dockyard conversion projects.

Second, regional and Freeport support. Solent Freeport status, granted in 2022, unlocks Enhanced Capital Allowances and Stamp Duty Land Tax relief for businesses inside the designated zones at Portsmouth International Port, Dunsbury Park, and the wider Solent corridor. The Freeport designation stacks on top of the 100% AIA, and several Portsmouth SMEs have used the combined relief structure to fund larger PV projects. The Solent LEP and the Portsmouth City Region also signpost SMEs to Net Zero capital schemes when these run.

Third, the Scottish & Southern Electricity Networks (SSEN) position. SSEN is the Distribution Network Operator across central southern England, including Portsmouth. SSEN currently quotes 65 working days for G99 technical studies and 4 to 12 months for actual connection on most networks in Portsmouth — generally at the shorter end of GB ranges, though parts of Cosham and the Historic Dockyard have seen tightness as commercial loads grow.

Local cost data — what Portsmouth businesses actually pay

A typical Portsmouth SME with 50 to 250 employees spends £30,000 to £55,000 a year on grid electricity at current 2026 fixed-contract rates. Larger commercial sites at Lakeside North Harbour, Voyager Park, or Airport Industrial with substantial process or HVAC loads run £130,000 to £450,000-plus. Hotel and conferencing operators at Gunwharf Quays and along the seafront spend £45,000 to £180,000 depending on size, while the University of Portsmouth and the Royal Navy Historic Dockyard estate push into the multi-million-pound annual electricity bracket.

For a Portsmouth rooftop solar PV installation in 2026, indicative cost per kW is:

• £900 to £1,200 per kW for systems below 100 kW (typical office, retail, small industrial)
• £750 to £950 per kW for systems 100 to 500 kW (typical warehouse, office park, hotel)
• £700 to £850 per kW for systems above 500 kW (large industrial, multi-building campus)

Portsmouth businesses installing under 100% Annual Investment Allowance receive an effective 25% tax discount in year one for limited companies at current corporation tax rates. Inside the Solent Freeport zone, Enhanced Capital Allowances stack to provide additional tax relief. Asset finance options spread cost over five to ten years and are typically EBITDA-positive from month one for daytime-occupied businesses.

Smart Export Guarantee tariffs available to Portsmouth commercial customers from suppliers including Octopus Outgoing Agile and E.ON Next Export Exclusive sit between 4 and 15p/kWh — meaningful contribution to economics for offices and retail tenants with weekend export. SSEN G99 connection timescales for systems above 100 kW are at the shorter end of GB ranges in most parts of Portsmouth.

A real Portsmouth install — Lakeside North Harbour 2024

A representative recent Portsmouth install: a 195 kW rooftop solar PV system commissioned in 2024 on a Lakeside North Harbour multi-tenant office building in the PO6 postcode occupied by a mix of insurance, technology, and professional services tenants. The building is a four-storey 2000s steel-and-glass structure of 4,200 square metres, with the landlord taking the PV asset and recovering benefit through the service charge and a green-lease addendum across all tenants.

The system comprises 360 panels installed across approximately 1,800 square metres of usable roof, fed by two string inverters integrated with the building’s existing 800 A three-phase supply. First-year generation reached 178,000 kWh, within 1.4% of the PVSyst yield model. Self-consumption sits at 75% across the building’s mixed tenant occupancy patterns; the remainder exports under SEG at a blended tariff of 11p/kWh.

Annual savings reached approximately £39,500 in year one (cost avoidance at 23p/kWh blended retail plus £4,800 of SEG export income, allocated across tenant service charges). Simple payback works out to 6.0 years for the landlord asset, with the tenants benefiting from a stable in-building energy cost. IRR over 25 years modelled at 14.4%. The install also contributed to the building achieving a BREEAM In-Use Excellent rating at re-certification, reinforcing its position in the Lakeside North Harbour office market.

Postcodes covered across Portsmouth

We deliver commercial solar installations across all 6 Portsmouth postcode districts:

• City centre and Old Portsmouth: PO1 (city centre, Old Portsmouth, Spice Island, Historic Dockyard, Gunwharf Quays)
• North Portsmouth: PO2 (Stamshaw, North End, Hilsea)
• Eastern Portsmouth: PO3 (Copnor, Baffins, Voyager Park, Airport Industrial Estate, Quartremaine Road)
• Southsea east: PO4 (Eastney, Milton, Southsea east)
• Southsea central: PO5 (Southsea, Castle Road, Albert Road)
• Cosham and Drayton: PO6 (Cosham, Lakeside North Harbour, Drayton, Farlington, Walton Road)

Most Portsmouth postcode districts are accessible from our base within a single drive cycle, supporting same-day site visits for feasibility and rapid response on commissioning issues across PO postcodes and into the surrounding south Hampshire.

Other commercial property areas adjoining Portsmouth

Portsmouth’s commercial property market extends across south Hampshire and into West Sussex, with several major business clusters in the surrounding area. We deliver commercial solar PV across:

• Gosport — Gosport town centre commercial and the Daedalus Enterprise Zone at the former HMS Daedalus airfield
• Fareham — Fareham Innovation Centre, Whiteley Business Park, and the Solent Enterprise Zone at Daedalus
• Havant — Havant Business Centre, Solent Industrial Estate Havant, and the Bedhampton commercial cluster
• Waterlooville — Waterlooville town centre commercial and the Wellington Way Industrial Estate
• Southsea — within the Portsmouth boundary but with its own retail and hospitality cluster along Albert Road and Palmerston Road
• Petersfield — Petersfield town centre commercial and the Bedford Road Industrial Estate
• Chichester — Chichester city centre commercial and the Quarry Lane Industrial Estate

Each of these falls under different councils — Gosport Borough, Fareham Borough, Havant Borough, East Hampshire District, Chichester District — all working under the South East regional climate framework with their own published 2030 to 2040 net zero targets. Several of our Portsmouth clients run multi-site portfolios across south Hampshire.

Frequently asked questions about Portsmouth solar

Does Portsmouth get enough sun for commercial solar to make sense? Yes — Portsmouth has one of the strongest UK commercial solar resources. Portsmouth receives 1,750 to 1,850 hours of sunshine per year, comparable to the south coast peak. A typical 100 kW Portsmouth commercial PV install generates around 105,000 to 110,000 kWh per year — comfortably ahead of the same install in the North or Scotland.

How long does SSEN take to approve a G99 connection in Portsmouth? Scottish & Southern Electricity Networks (SSEN) is Portsmouth’s DNO across central southern England. Current quoted timescales are 65 working days for the G99 technical study and 4 to 12 months for actual connection on most networks in Portsmouth — generally at the shorter end of GB ranges, though parts of Cosham and the Historic Dockyard have tightness as commercial loads grow. We submit applications immediately after structural survey.

How does Solent Freeport help with solar capex? Solent Freeport status, granted in 2022, unlocks Enhanced Capital Allowances on qualifying plant and machinery — including PV — for businesses inside the designated zones at Portsmouth International Port, Dunsbury Park, and the wider Solent corridor. The relief stacks on top of the standard 100% AIA. For larger PV projects, the combined tax structure can shave 5-10 percentage points off the IRR threshold needed for sign-off, and several Portsmouth SMEs have used the combined relief to fund larger projects than otherwise commercially viable.

What about Portsmouth’s Old Portsmouth and Historic Dockyard? Portsmouth has substantial conservation areas covering Old Portsmouth, Southsea, parts of the Historic Dockyard, and the Spice Island commercial cluster. PV on principal elevations of listed buildings inside the Historic Dockyard is generally not permitted, but rear-roof installations and PV on extensions or non-original roofs are routinely approved. We have completed PV on listed Portsmouth buildings by working with the council’s heritage planning team, Historic England, and the Defence Infrastructure Organisation where dockyard buildings are involved.

Can we install PV on a rented Lakeside North Harbour office unit? Yes, with the right lease structure. Most commercial leases at Lakeside North Harbour and similar Portsmouth office parks are full repairing and insuring leases that allow tenant or landlord-led PV with the right consent. The most common structure is a landlord-led PV asset with green-lease addendum allocating benefit through the service charge — this maximises the tax efficiency for the building owner while sharing the cost saving with tenants. We model both routes and produce a clear lease implication summary.

Get a free quote for your Portsmouth solar project

We have delivered commercial solar PV across Portsmouth and the wider Solent region since 2010. Every quote starts with a free desk-based feasibility study from your half-hourly meter data and roof drawings — no site visit required for the initial proposal. We will share an indicative system size, generation forecast, and IRR within 7 working days.

If the numbers work, our engineers visit for a one-day structural and electrical survey, after which we deliver a fixed-price proposal with full PVSyst yield modelling, financial DCF, and contract terms. Most Portsmouth installations move from first conversation to commissioning in five to eight months, with the longest item being the G99 grid connection from SSEN.

Whether you operate a Lakeside North Harbour office, a Voyager Park industrial unit, a Historic Dockyard supply chain business, or a Gunwharf Quays hospitality venue, we will be honest about whether your site suits solar — and tell you upfront if it does not. We would rather walk away from a project that will not deliver than damage the trust our clients place in us.