Why businesses should generate their own electricity in the UK

Key points to consider

Meta title: Why UK businesses should generate their own electricity

Meta description: Learn why UK businesses generate their own electricity with solar PV, batteries and on-site generation, including costs, risks, grid approvals and feasibility checks.

# Why businesses should generate their own electricity in the UK Businesses should generate some of their own electricity because it can reduce exposure to high grid prices, improve long-term cost control, support carbon targets and make operations more resilient. In the UK, this usually means partial business energy independence, not going fully off-grid. The strongest case is normally for sites with steady daytime electricity demand, suitable roof or land space, long-term site control and the ability to use most of the generated power on site. The practical summary is straightforward.

• Generate on site to reduce imported electricity.
• Size the system around real consumption data.
• Use exported power as a secondary benefit, not the main business case.
• Treat batteries as useful in the right circumstances, but not automatic.
• Check roof condition, grid approval, insurance and lease constraints early.
• Model future loads such as EV charging before finalising the design.

This is not only an environmental decision. For many UK businesses, generating electricity on site is a risk-management decision. Electricity bought from the grid includes wholesale energy costs, network costs, balancing costs, supplier margins, metering, VAT and policy-related charges such as the Climate Change Levy where applicable. Businesses are also not protected by the domestic energy price cap, as Ofgem explains in its energy advice for businesses, so a contract signed at the wrong time can leave a site exposed to painful rates for years. Government data also shows why energy planning needs to be treated commercially rather than casually. The Department for Energy Security and Net Zero publishes UK electricity price and energy market data through its Energy Trends and energy price statistics collections. These data sets show that electricity costs can move significantly over time, and non-domestic users are affected differently depending on contract structure, demand profile and site circumstances. Last reviewed: July 2026.

Why business energy prices feel so high

Business energy prices are high because a company’s electricity bill is more than the wholesale price of power. The delivered price includes the cost of moving electricity through transmission and distribution networks, balancing the grid in real time, supplier risk, metering, standing charges, VAT and other charges that vary by site and contract. For more background on the wider market, see our guide to why UK electricity prices are so high.

Gas still has a strong influence on UK electricity prices because gas-fired generation often helps set the marginal price in the power market. When gas prices rise, electricity prices can rise too, even if a business buys electricity from a supplier with a renewable tariff. Non-domestic contracts also vary widely depending on when the contract was agreed, the credit profile of the business, the meter type, the region, the volume used and the level of supplier risk.

For half-hourly metered sites, the bill can be more complicated than a simple unit rate. Peak-time use, agreed capacity, poor power factor, network charges and metering arrangements can all affect the final cost. This is why two businesses using the same annual kWh can face noticeably different bills. Generating electricity on site does not remove all of those charges. A grid-connected business will still pay for electricity imported from its supplier and may still pay standing charges, capacity charges and other costs. However, on-site generation reduces the amount of electricity bought through that system. Every kilowatt hour used directly from your own solar panels is a kilowatt hour you did not have to buy from your supplier at the full delivered import rate.

Business energy independence means control, not isolation

Business energy independence is often misunderstood. It rarely means cutting the cable to the grid. For most UK companies, the grid remains essential for winter demand, night-time use, unusually high loads and backup when equipment is being maintained.

A better definition is reducing dependency on imported electricity where it makes operational and financial sense. A business with solar PV might still import from the grid every day, but it can reduce daytime imports, improve budget certainty and make part of its electricity cost depend on an asset it controls rather than a market price it cannot control.

This matters because the best on-site generation projects are not judged by how many panels are fitted. They are judged by how much imported electricity is avoided at valuable times. A smaller, well-matched system can outperform a larger system that exports too much low-value power or is constrained by the local grid connection. Energy independence should therefore be treated as a spectrum.

• A modest system may reduce daytime imports and cut bills.
• A larger system may support carbon reporting and long-term energy strategy.
• A solar and battery system may increase self-consumption and help with peak demand.
• A backup-capable system may protect specific critical loads during outages.
• A full off-grid system is usually unsuitable for most mainstream commercial sites because of cost, complexity and reliability requirements.

For most businesses, the right goal is not isolation from the grid. It is more control over a material operating cost.

How on-site generation works for a business

Most commercial on-site generation is “behind the meter”. This means electricity is generated on the business premises and used by the site before electricity is imported from the grid. If generation exceeds demand, the excess can be exported, curtailed or stored in a battery if one is installed and configured to do so.

Solar PV is usually the most practical technology for UK businesses because many commercial sites have large roofs and daytime electricity demand. Warehouses, factories, offices, farms, schools, retail units, cold stores and leisure facilities can all be candidates, although the match varies strongly by load profile and building condition. Businesses at this stage can compare commercial solar options to understand what may suit their site and usage pattern.

Other technologies can work in specific circumstances.

• Wind can be suitable for exposed rural or coastal sites, but planning, grid connection and performance modelling are more complex.
• Hydro is highly site-specific and depends on water rights, flow, head and environmental constraints.
• Anaerobic digestion can suit farms, food processors and waste operators with suitable feedstock.
• Combined heat and power can work where there is a constant heat demand, although fossil-fuel CHP is not the same proposition as renewable electricity generation.
• Private wire arrangements can work for multi-site, landlord-and-tenant or neighbouring-user situations, but they need careful legal, metering and commercial design.

For most businesses starting the process, solar PV is the first technology to assess because it is modular, proven and comparatively straightforward to model against electricity consumption.

Why solar PV is usually the first option to assess

Commercial solar PV suits the UK better than many businesses assume. Panels generate from daylight, not heat, so cloudy weather reduces output but does not stop generation. UK output is commonly around 850 to 1,100 kWh per kWp per year, depending on location, roof orientation, shading, pitch, system design and maintenance.

Solar generation is strongest from spring to early autumn and lower in winter. This makes it particularly effective where a business has regular daytime demand during the brighter months. Cold stores, offices, farms with daytime processing loads, manufacturing sites and warehouses with steady electrical loads can be strong candidates. A school, by contrast, may have a weaker summer match if its buildings are lightly used during holidays, although term-time consumption and export arrangements can still make a project viable.

The economics usually favour self-consumption over export. If a business avoids buying electricity at a high import rate, that saving is normally worth more than selling surplus electricity at an export rate. Export can still help, especially where a supplier offers a suitable export purchase agreement, but a project based mainly on export income is usually less robust than one based on reducing imports. Solar PV also has strategic benefits beyond direct bill savings.

• It can reduce scope 2 electricity-related emissions where the reporting treatment is appropriate.
• It can support ESG, procurement and customer requirements.
• It can provide a visible investment in lower-carbon operations.
• It can help protect against future electricity price volatility.
• It can be integrated with EV charging, heat pumps or process electrification where these are planned properly.

Those benefits are useful, but they should not replace the core feasibility question: does the site use enough electricity at the right times to justify the investment?

The financial case is about reducing exposure

The financial case for self-generation is strongest when it turns part of a variable operating cost into a long-life asset cost. A commercial PV system may operate for 25 to 30 years, while inverters often need replacement after around 10 to 15 years. Lifetime planning should therefore include maintenance, monitoring, inverter replacement, roof access, cleaning where needed, insurance requirements and possible communications upgrades.

Commercial solar payback can be around 4 to 8 years where daytime self-consumption is high, the roof is straightforward and the import electricity rate is material. It can be longer where electricity rates are low, export is high, the roof is complex, finance costs are high or grid works are required. Small systems also tend to cost more per kWp than larger systems.

A simple roof with good access and modern electrical infrastructure is very different from an older site with fragile roof sheets, asbestos, weak switchgear and restricted export capacity. Larger sites with heavy loads may also want to compare industrial solar options rather than using a generic commercial estimate. Businesses should also consider financing structure.

• Buying the system outright can give more control and potentially stronger lifetime value, but it uses capital.
• A power purchase agreement can reduce upfront cost, but it commits the business to a long-term electricity purchase contract.
• Asset finance may spread cost while keeping ownership clearer than some third-party funded models.
• A landlord-funded system may work for tenants, but the lease, electricity supply and maintenance responsibilities need careful drafting.

No funding route is automatically better. The right option depends on capital availability, tax position, site control, contract length, appetite for ownership and long-term business plans. Businesses should take tax, legal and accounting advice where those issues are material.

Batteries can help, but they are not always needed

Battery storage can improve self-consumption, reduce peak imports and support resilience where the system is designed for backup. It can be particularly useful where solar generation regularly exceeds daytime demand, where peak charges are material or where the site has EV charging loads that can be managed intelligently. For sites where this is a genuine constraint, commercial solar battery storage can be assessed alongside the PV design rather than treated as an automatic add-on.

However, batteries add cost, space requirements, fire safety considerations and operational complexity. Commercial battery warranties are often around 10 years, and lifespan depends on cycling, temperature, depth of discharge, battery chemistry and control strategy. Lithium iron phosphate batteries are common for stationary storage, but the right design still depends on the site.

A common mistake is assuming a battery automatically keeps the business running during a power cut. Standard solar PV shuts down during a grid outage for safety. Backup requires islanding-capable equipment, protection design and a decision about which loads are essential. Whole-site backup is much more expensive than supporting selected circuits such as refrigeration, servers, tills, security systems, pumps or communications equipment. Battery projects should be assessed with clear objectives.

• Store surplus solar for later on-site use.
• Reduce maximum import demand.
• Avoid peak-time electricity where the tariff supports it.
• Support EV charging without increasing grid capacity.
• Provide backup for defined critical loads.
• Participate in flexibility or grid services where the commercial arrangements are suitable.

If the objective is unclear, the battery may become an expensive accessory rather than a useful asset.

The best projects start with half-hourly data

A business should not start by asking how many panels will fit on the roof. It should start by understanding when electricity is used. Twelve months of half-hourly consumption data gives a much better basis for sizing than annual kWh from bills.

• Daytime demand improves the value of solar generation.
• Weekend shutdowns can increase export.
• Seasonal closures can weaken the match.
• Night-time loads may need storage or a different strategy.
• EV charging plans can change future demand.
• Heat pumps or process electrification can materially change the load profile.
• Production shifts, refrigeration cycles and compressed-air use can affect the solar match.

The aim is to model generation against real load patterns, then choose a system size that delivers useful self-consumption without excessive export or curtailment. Self-consumption above 70% often improves project economics, while self-consumption below 50% can weaken the case unless export terms are strong or carbon objectives justify the additional generation. This is also where efficiency matters. Reducing waste first can reduce the size and cost of the generation system needed. LED lighting, controls, compressed-air leak reduction, refrigeration maintenance, motor efficiency, voltage optimisation where appropriate and demand scheduling can all improve the economics of generation. Good modelling should include sensitivity checks rather than a single optimistic forecast. At minimum, a business should understand how the project performs if import prices fall, export rates change, consumption drops, maintenance costs increase or the site’s operating pattern changes.

Site constraints can decide whether a project works

A business may have a strong electricity case but a weak site case. Roof condition, structural capacity, switchgear, grid capacity, access, planning restrictions, fire strategy, insurance requirements and landlord consent can all determine whether a project is viable.

• Planning

  Many commercial roof-mounted systems are permitted development, but restrictions can apply in conservation areas, listed buildings, airports, sensitive settings and ground-mounted projects.

• Operations

  Roof access, plant maintenance, drainage, fragile surfaces, asbestos management and future roof works all need to be considered.

• Roof condition

  PV can last longer than the roof covering, so end-of-life roofs should usually be repaired or replaced first.

• Grid connection

  Larger systems usually need G99 approval, and export limits or reinforcement costs can affect design.

• Structural capacity

  Flat roofs may need checks for ballast, wind uplift, panels, walkways and maintenance access.

• Electrical infrastructure

  Main switchgear, metering, cable routes, voltage rise and protection settings can limit system size.

• Insurance and fire safety

  Insurers may require isolation, access routes, maintenance procedures, fire service information and documentation.

Grid connection is especially important. Distribution Network Operators need to know when generation is being connected to their networks, and approval requirements depend on system size, export arrangements and local network conditions. Export-limited systems can sometimes avoid reinforcement, but the limitation needs to be properly engineered and accepted by the relevant network operator. Leased premises need particular care. A tenant may need landlord consent, a roof licence, lease amendments or agreement over who owns the system and who is responsible for maintenance. If the business expects to move soon, the economics become harder unless the asset can be transferred or the lease terms support the investment.

A bigger system is not always better

It is tempting to fill every available roof area, but oversizing can reduce financial performance if much of the extra generation is exported at a lower value or curtailed because of a grid export limit. More panels also mean more weight, more mounting, more cable management, more roof interaction and more maintenance obligations.

The right design depends on the business objective.

• Best resilience

  Design separate backup functions rather than assuming solar alone will protect the site.

• Lowest imported kWh

  Focus on high self-consumption and sensible demand matching.

• Lowest upfront cost

  Consider PPAs or phased installation, while checking long-term contract implications.

• Lowest carbon footprint

  Consider annual generation, carbon reporting rules and asset ownership.

• Maximum long-term control

  Ownership may be preferable where capital, roof control and maintenance capacity allow.

• Best fit for future electrification

  Model EV charging, heat pumps, new equipment and production changes before finalising the system size.

The most resilient commercial decision is usually not the largest installation, but the one that matches demand, respects the building and can be maintained properly. A good proposal should explain why the recommended system size has been chosen. If a design simply maximises roof coverage without showing load matching, export assumptions, grid constraints and maintenance access, it may not be the best commercial answer.

When generating your own electricity may not be suitable

On-site generation is not right for every business. A site with low daytime demand, heavy shading, a weak roof, short lease term, planned redevelopment, poor grid connection options or unresolved landlord restrictions may struggle to justify the investment.

It may also be less attractive where electricity prices are already low, where capital is urgently needed elsewhere or where export is the main source of value. A cheap installation can become expensive if it causes roof leaks, creates access problems, fails to satisfy insurers or lacks proper monitoring and maintenance.

There is also uncertainty. Electricity prices, export rates, tax treatment, business rates, technology costs and site operations can change. A good appraisal should test the project under different assumptions rather than relying on a single optimistic payback figure.

• Businesses should be especially cautious where:
• the roof is near the end of its life;
• the site lease is shorter than the expected payback period;
• future relocation or redevelopment is likely;
• the proposed design depends on unusually high export income;
• the installer has not requested half-hourly data;
• grid approval has not been considered;
• insurance requirements have not been checked;
• access for maintenance has not been designed properly.

In some cases, the right first step is not installing generation. It may be reducing consumption, improving controls, renewing electrical infrastructure or negotiating a better supply contract before committing capital to on-site assets.

What businesses should check before committing

A practical feasibility process should combine energy analysis, site inspection, commercial review and connection planning. The goal is to find out whether the project works as a business asset, not just whether equipment can be installed.

• Collect at least twelve months of half-hourly electricity data.
• Review current unit rates, standing charges, VAT and applicable levies.
• Check whether the current supply contract allows export or requires notification.
• Check roof age, roof warranty, access and structural capacity.
• Identify shading from plant, parapets, trees and neighbouring buildings.
• Review switchgear, metering, cable routes and communications.
• Ask about DNO approval, export limits and possible reinforcement.
• Speak to insurers before installation.
• Confirm ownership, maintenance and export income arrangements.
• Include inverter replacement and O&M in lifetime costs.
• Check whether the system will affect the lease, mortgage, landlord consent or future sale of the property.
• Confirm who monitors performance and what happens if output is lower than forecast.
• Review warranties, workmanship guarantees and maintenance responsibilities.
• Decide whether future EV charging or electrification should be included in the model.
• Useful evidence for a commercial decision includes:
• half-hourly load analysis;
• generation modelling using the proposed orientation and shading assumptions;
• self-consumption and export estimates;
• import tariff and export tariff assumptions;
• grid connection route and approval requirements;
• structural and roof condition findings;
• maintenance and replacement cost assumptions;
• sensitivity analysis for lower savings or higher costs.

A good installer or consultant should be willing to explain constraints, not just estimate headline savings. If the design depends on high export income, unusually low installation cost or assumptions that do not match your operating pattern, it deserves closer scrutiny. An early commercial electrical inspection can also help identify switchgear, metering and safety issues before the solar design is finalised. That evidence does not guarantee a perfect outcome, but it makes the investment decision much more robust.

The opinionated answer

UK businesses should generate their own electricity where the site, load profile and long-term plans support it because it gives practical control over a cost that has become difficult to predict. The objective is not total independence from the grid. It is reducing avoidable imports, locking in a portion of long-term energy supply and making the business less exposed to contract timing and market volatility.

Solar PV is the first option most businesses should investigate, especially if they own or control a suitable building and use electricity during the day. Batteries, PPAs, private wire arrangements, wind, CHP or other technologies may be useful in the right setting, but they should be justified by the actual load, not added because they sound strategic. If future demand includes fleet charging, commercial EV charger installation should be modelled with the solar proposal rather than bolted on later.

The best projects are boring in the right ways. They are based on real consumption data, conservative assumptions, sound roofs, safe electrical design, clear grid approval, insurer engagement and a maintenance plan. Businesses that approach generation this way are not chasing energy independence as a slogan. They are building a more controlled and resilient electricity strategy.