commercial battery storage installation in Portsmouth

Serving Portsmouth and the wider Hampshire area, including Gosport, Fareham, Havant.

In Portsmouth, a commercial battery storage installation is an engineering and grid-connection project first and a product purchase second. Your Portsmouth site connects through Scottish & Southern Electricity Networks (Southern), and the Scottish & Southern Electricity Networks G99 timeline — not the physical build — governs the programme. As installers who cover Portsmouth end to end, we own the whole chain: survey, Scottish & Southern Electricity Networks liaison, fire design, civils, install, protection and witnessed commissioning, rather than dropping off a battery and leaving the connection to you. That single-contractor accountability across Hampshire is what keeps a Portsmouth project on schedule.

Why storage, and why now, in Portsmouth

With commercial anchors around the Spinnaker Tower, Portsmouth Naval Base, Lakeside North Harbour and busy estates such as Lakeside North Harbour, Walton Road, Airport Industrial Estate, Portsmouth sites carry large, rising electricity bills — commonly £38,000 a year — of which an ever-greater slice is red-band DUoS, capacity and standing charges rather than raw energy. As Portsmouth City Council drives toward its 2030 net-zero target, demand on the Scottish & Southern Electricity Networks network is climbing and Portsmouth connections are tightening. That is precisely when a correctly installed battery earns its keep: with a G100 scheme it lets a Lakeside North Harbour site add load inside its existing capacity instead of paying for a reinforcement.

Grid connection in Portsmouth through Scottish & Southern Electricity Networks

In Portsmouth, Scottish & Southern Electricity Networks (Southern) owns your programme. Its G99 study and connection offer can take three to eighteen months, so we apply at survey and, where the Portsmouth network around Lakeside North Harbour is constrained, engineer a G100 limitation scheme that keeps the site inside its agreed capacity while the connection is resolved. Our scope covers the application, the protection settings, the DNO liaison and any witness testing, plus the CT and half-hourly metering design that makes the control strategy correct from day one.

A Portsmouth install in practice

A Lakeside North Harbour campus installed an indoor cabinet BESS for resilience and demand-charge reduction, with the battery room compartmented and detected to the building fire strategy. We start the G99 study and DNO consultation on day one, and engineer a G100 limitation scheme where the network is constrained. This is the Portsmouth pattern we see most: the business case is simple, but delivering it needs the Scottish & Southern Electricity Networks connection, the PAS 63100 fire siting and the live-switchgear tie-in engineered together. We plan the tie-in around your operations so production in Portsmouth keeps running while the battery goes in.

Fire safety and siting in Portsmouth

The fire strategy — separation, ventilation, detection and access — is settled at feasibility, before any plant is ordered. For a containerised system on a Portsmouth yard that means separation distances, bunding and firefighting access to NFCC guidance; for an indoor cabinet in a Portsmouth switchroom it means compartmentation, ventilation and detection tied into the building alarm. We specify LFP cells for their thermal stability and engage your insurer, and where needed the fire service covering Portsmouth, before the plant is on site.

Containerised or indoor for a Portsmouth site

A Portsmouth install is either a containerised outdoor system or an indoor cabinet, and the choice is driven by capacity, space and fire design. Containers suit Portsmouth sites with yard space such as Lakeside North Harbour, scale to several MWh and keep a thermal event outdoors; indoor cabinets suit 60 to 500 kWh in a properly compartmented Portsmouth switchroom. We assess both — including the multi-tenant consents an occupied Portsmouth building needs — before recommending one.

Cost, funding and capital allowances for Portsmouth businesses

Portsmouth install costs land around £150,000 to £300,000 for 250 kW / 500 kWh and £600,000 to £1.2m for 1 MW / 2 MWh, plus any Scottish & Southern Electricity Networks connection works. On the tax side, a Portsmouth business claims 100% AIA on the first £1m of qualifying spend and a 50% first-year allowance thereafter (special-rate — not full expensing); we model capital, finance and lease routes side by side. Note the 0% VAT relief excludes general commercial premises.

Sizing from your Portsmouth half-hourly data

Sizing a Portsmouth battery is a survey exercise: twelve months of half-hourly data, the incoming supply capacity, and the available fault level, not a per-kWh guess. Portsmouth behind-the-meter systems usually settle at 1.5 to 2.5 hours of duration — for example 250 kW / 500 kWh — costing about £400 to £700 per kWh installed. Against a typical Portsmouth bill of £38,000, the model shows exactly which half-hours to target.

Commissioning and handover in Portsmouth

Every Portsmouth install ends the same way: a documented, witnessed commissioning. Protection and control settings verified, G99/G100 functions demonstrated to Scottish & Southern Electricity Networks where required, metering and monitoring proven, cell and thermal management confirmed. You receive the test results, the settings schedule, the electrical and fire certification, and a planned O&M regime — the records a Portsmouth insurer and auditor expect.

Areas and postcodes we cover around Portsmouth

We install across Portsmouth and the surrounding Hampshire area, including Gosport, Fareham, Havant, Waterlooville, Southsea. Local postcode districts we regularly work in include PO1, PO2, PO3, PO4, PO5, PO6. From Lakeside North Harbour to Walton Road and newer Portsmouth commercial parks, every job runs the same way — survey, early Scottish & Southern Electricity Networks G99, fire siting, commissioning — and we extend to nearby Southampton, Chichester, Bognor Regis so multi-site South East operators get one installer.

Portsmouth battery storage installation FAQs

How long will a battery installation take in Portsmouth? The physical install is one to six weeks, but the programme depends on Scottish & Southern Electricity Networks (Southern): a G99 study can run three to eighteen months. We apply at survey so the DNO milestone does not extend the Portsmouth programme, and use G100 limitation to connect sooner where the network allows.

Can you install without shutting down our Portsmouth site? In most cases yes — the tie-in is planned around your operations, with temporary supplies or a short pre-agreed outage only where unavoidable, all method-statemented before we mobilise in Portsmouth.

Do you handle the Scottish & Southern Electricity Networks paperwork? Yes: the G99 application, protection settings, half-hourly metering and DNO liaison are in scope for every Portsmouth install, with G100 limitation design where the network is constrained.

What does it cost to install a commercial battery in Portsmouth? Roughly £400 to £700 per kWh installed — about £150,000 to £300,000 for a 250 kW / 500 kWh system — with 100% AIA on the first £1m then a 50% first-year allowance on the balance.

What you get

One accountable contractor across the survey, the G99/G100 design, the fire strategy, the civils, the install, the protection and the witnessed commissioning — with an itemised fixed-price proposal, a 10-year insurance-backed workmanship warranty, a documented commissioning pack and a planned O&M regime. We will tell you honestly if your Portsmouth site’s profile does not justify a battery. If it does, we will show you the programme with the Scottish & Southern Electricity Networks milestone marked plainly as the critical path. Get a free Portsmouth feasibility, or read our honest take on whether commercial battery storage is worth it.