How Can a Business Use Renewable Energy? The 5-Step Roadmap

How businesses use renewable energy: the short version

The question we hear most from owner-directors and finance teams is a simple one: how businesses use renewable energy in practice, and where to start. The honest answer is that it is no longer a single decision about solar panels. UK commercial electricity now costs 25 to 45p per kWh, roughly double what it was in 2021, gas is volatile, and customers, investors and lenders increasingly ask what you are doing about carbon. The businesses getting this right treat energy as a system, and they follow an order.

That order matters more than any single product. Spent in the wrong sequence, the same money buys a smaller result. Spent in the right one, each measure pays for itself and helps fund the next. Below is the five-step roadmap we use on every site, with real UK figures so you can see roughly where your business would land.

Step 1: Measure and reduce

The cheapest kWh is the one you never use. Before spending a penny on generation, we pull your half-hourly meter and gas data and run an audit-grade look at where the energy actually goes. An energy management and efficiency programme, voltage optimisation, LED lighting, HVAC controls and half-hourly monitoring, typically removes 8 to 25% of consumption at a one to four-year payback.

This is not a footnote. Reducing demand first means any solar, battery or heat pump you install afterwards is sized to a lower, well-managed load, so you are not paying to generate power you were only going to waste. For large undertakings, an ESOS-grade audit is a legal requirement every four years anyway, so the diagnostic work often has to happen regardless.

Step 2: Generate clean power on site

For most UK businesses, on-site commercial solar PV is the single biggest lever. Generation aligns with the working day, so 55 to 85% of what you produce is used on site rather than exported cheaply. A large, unshaded warehouse, factory or agricultural roof is the ideal canvas; car parks and spare land suit solar carports and ground-mount.

Costs run at roughly £600 to £1,300 per kWp, so a small office array starts around £25,000 and a large factory system can reach £1.5m. With 100% Annual Investment Allowance, VAT reclaim and the Smart Export Guarantee, the typical payback is 5 to 8 years, followed by 15 to 20 years of near-free power under a 25-year warranty. Every system should be sized from your consumption, not your roof area.

On the right sites, wind or combined heat and power add to the mix, but we assess these honestly and say when they do not stack up against solar.

Step 3: Store and shift

Solar generates through the day; your demand may peak in the evening, overnight or at weekends. Battery storage closes that gap. It stores surplus solar, lifting self-consumption from 55 to 75% up to 80 to 95%, shifts grid import to cheap overnight tariffs, and shaves expensive peak demand charges. A commercial battery typically runs £20,000 to £500,000 depending on size, with a 5 to 9-year payback.

We usually recommend adding storage once you have a year of solar data, so it is sized to the load it will actually displace. Most PV systems are designed battery-ready so this second phase drops in cleanly.

Step 4: Electrify heat and transport

This is where you remove the Scope 1 emissions that on-site solar alone cannot touch. Commercial heat pumps replace gas and oil boilers for space heating, hot water and some process heat, delivering 3 to 4 kWh of heat per kWh of electricity (a COP of 3 to 4). They run strongest on self-generated solar and are best paired with a fabric and controls upgrade. Systems run £30,000 to £750,000 with a 7 to 12-year payback.

Alongside heat, commercial EV charging covers staff, visitor and fleet needs, from 7 kW workplace posts to 350 kW rapid hubs. The Workplace Charging Scheme gives £350 per socket up to 40 sockets, and the EV infrastructure grant helps with wiring and groundworks. Charging a fleet on self-generated power at a few pence per kWh, rather than grid power at 25 to 45p or forecourt fuel, transforms the economics.

Crucially, solar, battery and EV charging work best designed as one integrated system with load management, not three separate installs, so you avoid a costly grid upgrade.

Step 5: Fund and procure

None of this needs to be a single large capex hit. There are four routes, and we model them side by side.

Funding route	Upfront cost	Best for
Cash purchase	Full capex	Profitable firms wanting maximum lifetime return
Asset finance	Nil, spread over 5-7 years	Cash-flow-positive from month one
On-site PPA	Zero capex	Balance-sheet-constrained firms
Grants and tax relief	Reduces net cost	Layered on top of any route above

For owned kit, 100% Annual Investment Allowance and Full Expensing let a company deduct the full cost from taxable profit, recovering roughly a quarter of the outlay through tax. A Power Purchase Agreement needs zero capital: a funder owns the on-site generation and you simply buy the power at a fixed rate below grid. See our cost breakdown and the full list of grants and funding, including the Smart Export Guarantee, the Industrial Energy Transformation Fund for energy-intensive manufacturers, and the Public Sector Decarbonisation Scheme for public bodies. Note that the domestic Boiler Upgrade Scheme does not apply to commercial buildings.

What the roadmap looks like in numbers

To make it concrete, here is a representative, modelled example rather than a specific named client. A Midlands logistics operator running a 3,000 sqm depot with £110,000 a year in electricity fitted 220 kW of rooftop solar, a 215 kWh battery and twelve 22 kW EV chargers. The solar was funded on a zero-capex on-site PPA and the chargers part-funded by the Workplace Charging Scheme. The result: around £61,000 a year saved, 82% self-consumption, a fleet now charging on its own power, and a renewable disclosure strong enough to help retain a national contract.

The point is not the specific figures, which vary by site, but the shape: measure, generate, store, electrify, fund, each step earning its keep.

Why the order matters more than the technology

Every competitor treats these as a flat menu. In practice, sequencing by payback keeps the whole programme cash-positive as it grows. Efficiency pays back fastest and shrinks everything that follows. Solar is the biggest single win for most sites. Storage and electrification build on that generation. Funding is chosen last, on merit, once you know what you are buying.

We are technology-neutral, so our advice is not steered by one product. We will tell you honestly if a heat pump should wait until you have improved the fabric, or if your roof beats your car park for the first project. That independence is the difference between a bankable roadmap and a product sale.

If you want to see how your own building maps onto these five steps, the fastest route is a free assessment from your meter data. Request a quote or read our FAQs first, and we will give you a costed roadmap you can take to the board.