Renewable Energy for Businesses in Portsmouth

Why renewable energy for Portsmouth businesses makes sense now

Portsmouth is a dense, working city of around 208,100 people packed onto Portsea Island and its mainland fringe, and its commercial base is exposed to exactly the energy pressures that make on-site renewables pay. With UK commercial electricity now costing 25 to 45p per kWh and gas volatile on top, a typical Portsmouth commercial site spending roughly £38,000 a year on energy is watching that cost erode margin on every unit consumed. Renewable energy for Portsmouth businesses is no longer a single decision about solar panels: it is a system that measures and cuts waste first, generates clean power where the roof or car park allows, electrifies heat and transport, stores and shifts demand, and locks in the economics with the right tax relief, grants or a power purchase agreement.

We are independent and technology-neutral. We assess your building, your load profile and your fleet from half-hourly meter data, then recommend the mix that genuinely suits the site, in the order that keeps the programme cash-positive. Sometimes that is solar and battery; sometimes it is a heat pump to remove gas; sometimes the first and cheapest win is simply cutting waste before a single panel goes up. We say honestly when a measure does not stack up.

Portsmouth’s commercial and industrial geography

Portsmouth’s economy runs from the naval dockyard and the ferry port through office parks, light industry, retail and a large public sector, and each setting suits different technology.

Lakeside North Harbour, the large business park off the M27 at Cosham, is dominated by offices and corporate occupiers whose demand tracks the working day almost perfectly. That daytime load profile is the ideal canvas for commercial solar: generation lands exactly when the desks, servers and air handling are drawing power, so 55 to 85 per cent is used on site. Offices here also tend to have staff car parks, which makes workplace EV charging an easy pairing, and energy management measures such as HVAC controls and LED typically strip 8 to 25 per cent off consumption before any capital project.

The lighter industrial areas around Walton Road, Voyager Park off Portfield Road, and Quartremaine Road in Copnor hold trade counters, workshops, warehousing and distribution units. Larger unshaded roofs here are the strongest first project for rooftop solar, and units running refrigeration, compressors or extended shifts benefit most from battery storage to shift load and shave peak demand charges. The Airport Industrial Estate, on the former Portsmouth airport land at Anchorage Park, mixes trade, light manufacturing and logistics where solar plus battery, and depot charging for commercial vehicles, most often make the numbers work.

Surrounding the city, the commercial corridors of Fareham, Havant, Waterlooville and Gosport hold the larger-footprint industrial and manufacturing sites, while Southsea is retail, hospitality and leisure with smaller roofs but long export windows. A Southsea hotel or restaurant that exports at weekends earns from the Smart Export Guarantee, while a Havant factory with a steady daytime process load is a classic large-solar-plus-storage case. We treat each of these settings on its own merits rather than applying one template.

The council net zero target and what it means locally

Portsmouth City Council has committed the city to net zero carbon by 2030, one of the more ambitious municipal targets in the country. For local businesses this matters in two practical ways.

First, planning support. Most rooftop solar on commercial buildings is Permitted Development under Class A Part 14 of the GPDO, so a great many Portsmouth units and offices can install without a full planning application, though listed buildings and the conservation areas around Old Portsmouth, the seafront and the historic dockyard will need consent. A council with a live decarbonisation agenda is generally a constructive planning partner for well-designed renewable projects.

Second, procurement and ESG expectations. A council pursuing a 2030 target increasingly weights carbon and social value in its own contracts, and the larger anchor employers in the city, from the defence and maritime sector to the universities and the NHS, pass Scope 1, 2 and 3 questions down their supply chains. If you tender to public bodies or large corporates locally, a credible on-site generation story and auditable carbon reductions are becoming a scoring factor rather than a nicety. On-site solar and a genuinely additional PPA are defensible claims for SECR and customer questionnaires in a way that a REGO-only green tariff is not.

Local grid and connection context

Portsmouth sits in the Southern Electric Power Distribution licence area, operated by SSEN as the Distribution Network Operator. Small solar systems connect under the fast-track G98 or G99 process, but most commercial generation and any grid-connected battery need a full G99 application to the DNO. Typical timescales run from around 4 to 12 weeks for a small connection out to 6 to 18 months for a large one, so applications go in early. On a constrained, densely built island network, G100 export or import limiting is a common and useful tool: it lets a project connect quickly and avoid costly network reinforcement by capping how much it puts back onto the grid. For EV rapid hubs and heat-pump loads, intelligent load management often avoids a supply upgrade altogether. We handle the G99 paperwork and design to the connection you can actually get.

A representative Portsmouth project

Consider a modelled example: a distribution and trade business on a 3,000 square metre unit off Walton Road, spending around £90,000 a year on electricity with a small but growing electric van fleet. Rather than sell a single product, we would size the system from a year of half-hourly data. A representative solution combines a 200 kW rooftop solar array with a 200 kWh battery and a bank of workplace and depot EV chargers.

The solar generates through the working day when the unit’s load is highest, pushing self-consumption toward 80 per cent with the battery covering the early-shift ramp and holding surplus for the evening. The fleet then charges on self-generated power at a few pence per kWh instead of grid power at 25 to 45p or forecourt diesel. On figures consistent with our modelling, a project of this shape lands a payback in the region of six years while cutting a meaningful share of grid electricity and removing tonnes of CO2 across both Scope 1 fleet fuel and Scope 2 electricity. The chargers would be part-funded by the Workplace Charging Scheme and the whole array could, if the board preferred zero capex, be funded through an on-site PPA. Every figure here is illustrative and modelled from typical Portsmouth conditions, not a specific named client.

Local cost and funding context

For a Portsmouth site on that roughly £38,000 average annual energy spend, the question is rarely whether renewables pay but which measures pay first. Commercial solar runs about £600 to £1,300 per kWp installed, so a modest office or workshop array might be £25,000 while a large factory system reaches into six or seven figures; battery storage typically £20,000 to £500,000; commercial heat pumps £30,000 to £750,000; and EV charging from around £3,000 for a couple of workplace posts to £150,000 or more for a rapid hub. Efficiency measures often pay back in one to four years, solar in five to eight, with 15 to 20 years of near-free power after that under a 25-year warranty.

The funding routes stack. 100% Annual Investment Allowance and Full Expensing let a profitable company deduct the full cost of solar, batteries, heat pumps and EV chargers from taxable profit, recovering roughly a quarter of the outlay through tax, with VAT separately reclaimable. The Smart Export Guarantee pays for surplus exported at weekends and overnight, which suits Southsea retail and hospitality and city-centre offices. The Workplace Charging Scheme gives £350 per socket up to 40 sockets, and the EV infrastructure grant helps smaller firms with wiring and groundworks. Where the balance sheet is the barrier, an on-site Power Purchase Agreement installs generation at zero capex and you simply buy the power below grid price. We model cash purchase, asset finance and PPA side by side so the numbers are clear. See our full cost and grants and funding breakdowns for the current figures. Note that the domestic Boiler Upgrade Scheme does not apply to commercial or non-domestic buildings; commercial heat is funded through capital allowances and, for eligible sites, the Industrial Energy Transformation Fund.

Start with an honest assessment

Portsmouth businesses do not need another single-product cold call. They need an independent view of the whole site: what to do first, what to defer, and what the return is on each measure. We pull your meter data, look at your roof, car park, heat demand and fleet, and give you a costed roadmap sequenced by payback, with the carbon saving of each step. If you would like to see what renewable energy could do for your Portsmouth site, request a free, no-obligation quote and we will build the assessment around your building, not a template.