The Best Renewable Energy for Your Business: Solar vs Heat Pumps vs Wind vs Battery

What is the best renewable energy for business?

Ask ten salespeople and you get ten answers, each pointing at the one product they happen to sell. The honest answer is that the best renewable energy for business is rarely a single technology. It is the right combination for your building, load profile and budget, installed in the right order so each pound earns its return. For most UK businesses that combination starts with solar PV, because it is low-risk, uses roof space you already own, generates in step with the working day and pays back in 5-8 years. But a rural site with land might justify wind, a gas-heavy building needs heat pumps to cut its Scope 1 carbon, and a fleet operator prioritises EV charging.

This guide compares the four technologies most businesses weigh up, solar, heat pumps, wind and battery storage, on the things that actually decide a project: cost, payback, carbon and where each one genuinely fits. It is written to help you choose, not to sell you one box.

The four technologies, side by side

The table below uses real UK figures for typical commercial installations. Costs and paybacks vary with your site, tariff and how the system is used, so treat these as planning ranges rather than a quote.

Technology	Typical project value	Typical payback	What it does best	Where it fits
Solar PV	£25,000 - £1.5m	5-8 years	Cuts daytime electricity bills and Scope 2 carbon	Large unshaded roofs, car parks, spare land
Battery storage	£20,000 - £500,000	5-9 years	Stores surplus solar, shifts to cheap tariffs, shaves peak charges	Sites with solar or a spiky load shape
Heat pumps	£30,000 - £750,000	7-12 years	Removes gas heating and Scope 1 carbon	Gas or oil-heated buildings, process heat
Wind	£40,000 - £1m+	9+ years	Generates around the clock, complements solar in winter	Exposed rural and coastal sites with land

None of these is universally “best”. They solve different problems, and the strongest results usually come from combining two or three of them as one system.

Solar PV: the default first move for most businesses

Commercial electricity now costs 25-45p per kWh, roughly double what it did in 2021, so the biggest lever for most businesses is generating power on site during the working day. A commercial solar system runs about £600-£1,300 per kWp, generates around 900-1,000 kWh per kWp a year in the UK, and typically covers 55-85% of its output on site when sized to your consumption rather than your roof area.

The economics stack up because three things work together: the Smart Export Guarantee pays 4-15p per kWh for surplus you export, 100% Annual Investment Allowance lets a profitable company recover roughly a quarter of the cost through tax, and VAT is separately reclaimable. Most rooftop PV is Permitted Development, so planning is rarely a barrier. That combination is why solar sits first on most roadmaps. See our commercial solar pillar for the full detail, and /cost/ for how pricing scales with system size.

Solar’s one honest limitation: it cuts your electricity carbon (Scope 2), but it does nothing for gas heating (Scope 1). If your emissions are dominated by a gas boiler, solar alone will not get you to net zero.

Battery storage: the multiplier, not usually the starting point

A battery does not generate anything, it stores and shifts. Added to solar, it lifts self-consumption from 55-75% up to 80-95% by holding surplus daytime generation for evening, weekend and overnight use. It also shifts grid import to cheap overnight tariffs, shaves expensive peak demand charges, and can provide resilience for sites where an outage is costly.

The mistake is buying a battery too early. Sized well, from a year of real load data, it pays back in 5-9 years. Sized on a guess, it can sit half-empty and never pay back. Our advice is almost always to design solar as battery-ready and add storage once you have the data to size it. More on this in the battery storage pillar.

Heat pumps: the only way to cut gas carbon

If solar is the answer to expensive electricity, heat pumps are the answer to gas. A commercial heat pump delivers 3-4 kWh of heat for every kWh of electricity it uses (a COP of 3-4), replacing gas or oil boilers for space heating, hot water and some process heat. They are the route to removing Scope 1 emissions that on-site solar simply cannot touch, and they are strongest when run on self-generated solar power.

Two honest caveats. First, payback is longer, typically 7-12 years, and best results come from a fabric and controls upgrade first so the system is sized to a lower heat demand. Second, funding is different from the domestic world: the Boiler Upgrade Scheme does not apply to commercial buildings. Commercial routes are capital allowances, the Public Sector Decarbonisation Scheme for public bodies, and the Industrial Energy Transformation Fund for energy-intensive manufacturers. The heat pumps pillar covers system types and sizing.

Wind: powerful where it fits, wrong for most

Small and medium wind generates around the clock and complements solar in winter, which is genuinely valuable. But it only stacks up on exposed rural and coastal sites with land and a decent measured wind speed. It almost always needs full planning permission with noise, shadow-flicker and often an Environmental Impact Assessment, so lead times and costs run higher and paybacks stretch to nine years or more.

We assess wind speed, land, grid capacity and heat demand honestly, and we say plainly when wind does not stack up against solar for a given site, which is most of the time. For the sites where it does, and for combined heat and power on high-constant-heat operations, see the wind and CHP pillar.

The order matters more than the technology

Here is the point most guides miss: the sequence you buy in changes the return more than the choice of technology. The order that maximises value is:

1. Measure and reduce. An energy audit plus voltage optimisation, LED and controls typically removes 8-25% of demand at a 1-4 year payback. Every kWh you cut is one you never have to generate.
2. Generate. Solar PV sized to 60-85% of the reduced consumption, the single biggest lever for most businesses.
3. Store and shift. Add battery once you have a year of data, and manage EV charging with load balancing.
4. Electrify. Heat pumps to remove gas, and EV charging for fleet and staff, ideally run on your own generation. The Workplace Charging Scheme gives £350 per socket up to 40 sockets.
5. Fund. Use capital allowances and grants for owned kit, or a zero-capex Power Purchase Agreement for clean power with no upfront spend.

Following this energy hierarchy is the single biggest reason some renewable projects pay back years faster than others. It also means each measure is sized to a demand that has already been reduced, so you never pay to generate power you are wasting.

A representative example

Take a modelled Midlands logistics depot: a 3,000 sqm unit with £110,000 a year in electricity and a growing electric van fleet. Sequenced properly, it took 220 kW of rooftop solar, a 215 kWh battery and twelve 22 kW chargers. The solar was funded on a zero-capex PPA and the chargers part-funded by the Workplace Charging Scheme. The result modelled at 82% self-consumption, around £61,000 a year saved and a six-year payback, with the fleet now charging on self-generated power. No single technology delivered that, the combination did.

So what is best for you?

For most UK businesses, the honest answer is: cut waste, then solar, then build out from there. But the genuinely best result comes from an independent assessment that sequences the right mix for your building and load profile, not from whichever product a salesperson happens to sell. We size every measure from your half-hourly meter and gas data, model cash, finance and PPA side by side, and tell you honestly when something does not stack up.

If you want the numbers for your own site, our /grants-and-funding/ page sets out every scheme that applies, and you can request a free, no-obligation assessment that returns a costed roadmap you can take to the board. If you would rather read first, the FAQs answer the questions decision-makers ask most.