Pillar guide
Battery storage finance in the UK: the complete guide for commercial projects
Battery energy storage is now one of the most commonly funded pieces of kit on a UK commercial site, and one of the most commonly misunderstood by lenders. This guide covers what a system costs, how the funding is normally structured, what funders look at, and where projects usually stall.
The short version
- Commercial battery storage is normally funded on hire purchase or a finance lease over three to seven years, not on a business loan.
- Deposits range from VAT only on well supported cases to twenty percent or more where the business is young or the technology is unusual.
- Installation, switchgear, protection, civils and commissioning can usually sit inside the same facility as the battery itself.
- The saving case matters as much as the balance sheet. Funders read avoided cost, not just accounts.
- Grid connection timing is the single most common cause of a funded battery project slipping.
What battery storage finance actually is
Battery storage finance is asset finance applied to a battery energy storage system, usually referred to as BESS. A funder pays for the equipment and the installation, your business takes delivery and use of the system, and you repay over an agreed term rather than paying for the whole project out of working capital.
The two structures that cover most commercial battery projects are hire purchase and a finance lease. Hire purchase is a route to ownership: you pay a deposit, repay the balance with interest and title passes to you at the end. A finance lease keeps title with the funder, which can suit businesses that want a lighter initial outlay or expect to refresh the technology.
What separates battery finance from ordinary equipment finance is that a battery is rarely a single invoice. There is a cell stack or container, an inverter or power conversion system, switchgear and protection, cabling, a base or foundation, a control system and a commissioning process. A funder that only understands invoices will fund part of that. A funder that understands energy projects will fund the scope.
What a commercial battery system costs in the UK
Pricing has moved considerably in the last few years and continues to move. As a working guide for a behind the meter commercial installation, fully installed costs typically land in the ranges below. Containerised utility scale projects price differently again and are usually quoted per megawatt hour rather than per kilowatt hour.
Figures on this page are indicative ranges drawn from UK market pricing we see across quotes and funder appetite. They are illustrations, not quotations, and every project prices on its own scope, site and credit profile.
| System size | Typical installed cost | Common application |
|---|---|---|
| 30 to 100 kWh | £20,000 to £70,000 | Small industrial unit, workshop, farm, solar self consumption |
| 100 to 500 kWh | £60,000 to £250,000 | Manufacturing site, cold store, hotel, larger solar pairing |
| 500 kWh to 2 MWh | £220,000 to £800,000 | Peak shaving on heavy load sites, EV charging hubs |
| 2 MWh and above | Priced per project | Grid services, multi site portfolios, front of meter |
- Hardware is usually between half and two thirds of the total. The rest is electrical works, civils, protection and commissioning.
- Sites needing a new or upgraded connection carry a DNO cost that sits outside the equipment quote and is often not fundable in the same way.
- A tight, itemised scope of works from the installer makes the funding conversation faster and usually cheaper.
How the funding is normally structured
Most commercial battery projects we place fall into one of four shapes. The right one depends on how long you expect to run the asset, your tax position and how much cash you want to keep in the business through the installation period.
| Structure | Typical term | Deposit | Best suited to |
|---|---|---|---|
| Hire purchase | 3 to 7 years | VAT only to 20% | Businesses that want ownership and the capital allowances |
| Finance lease | 3 to 6 years | 3 to 6 monthly rentals | Lighter initial outlay, technology likely to be refreshed |
| Staged or drawdown facility | Set on completion | Project dependent | Larger builds paid against installation milestones |
| Refinance after install | 3 to 5 years | None | Cash already spent, capital released back into the business |
- Seasonal or stepped payment profiles are possible where the saving builds over time or the business trades seasonally.
- VAT deferral for the first one to three months is common on larger orders and protects cash before the system is earning.
- Multiple sites are usually cleaner under one facility than as separate applications per site.
What funders actually look at
Credit quality still matters, but a battery proposal that only presents accounts is a weak proposal. The strongest cases put the operating logic in front of the funder alongside the numbers.
- Filed accounts and management information, with any loss or dip explained rather than left to be discovered.
- The avoided cost the system targets: peak demand charges, diesel burn, curtailed solar export, capacity charges.
- Half hourly consumption data where it exists. Real load data is far more persuasive than a supplier projection.
- The installer, the equipment brand and whether the warranty and performance guarantee are bankable.
- Whether the site connection and any planning requirement are already resolved.
Grid connection, DNO timing and why projects slip
The most common reason a funded battery project moves backwards is not credit, it is the connection. Anything that changes the import or export capacity at the site involves the distribution network operator, and those timelines are outside both your control and ours.
Behind the meter systems that operate inside existing capacity are the fastest route, because they usually require a notification rather than a new connection agreement. Once you are asking for additional import capacity or export rights, the timeline extends and the funding needs to flex with it.
- Confirm early whether the system runs inside existing capacity or needs a new connection agreement.
- Where a connection offer is outstanding, structure the facility so drawdown follows the works rather than the order date.
- Keep the funder informed of slippage. Rewriting a facility mid build is normal, surprises are not.
Funding battery storage alongside solar
Most of the battery projects we see arrive attached to a generation asset. Storage is what turns exported solar into consumed solar, and it usually improves the financial case for both.
Funding them as one project rather than two agreements is normally cleaner: one credit decision, one facility, one payment date, and a scope of works that the funder reads as a single engineering case rather than two unrelated purchases.
Tax treatment in outline
Hire purchase and finance leases are treated differently for tax, and the difference can be material on a project of this size. Under hire purchase the business is usually treated as owning the asset and may be able to claim capital allowances on the capital cost, with the interest element relieved as it is charged. Under a finance lease the rentals are generally treated as a deductible expense instead.
Whether a particular battery installation qualifies for a given allowance depends on the equipment, how it is used and current legislation. We are a finance broker, not tax advisers, so confirm the treatment with your accountant before you choose a structure on tax grounds.
What the process looks like with GRID
We start with the project rather than the paperwork. Before we talk about rates, we want to understand the load, the scope of works and what the system is being bought to achieve. That is what gets written into the proposal.
- Initial conversation about the site, the load and the equipment being considered.
- An honest view within 24 hours on whether the project is fundable and roughly where it lands.
- A proposal built around the operating case, placed with funders who understand energy assets.
- Documentation, drawdown against the installation, and one point of contact throughout.
Where this applies
FAQs
Common questions
The questions that come up most often on this subject.
Can a UK business finance battery storage without a large deposit?
Often, yes. Well supported cases on established equipment can be arranged on a VAT only deposit, which keeps the capital cost out of the business bank account entirely. Newer businesses, unusual technology or a weaker trading record typically move the deposit into the ten to twenty percent range.
What term is normal for battery storage finance?
Three to seven years covers most commercial projects, with four to five being the most common. The term should be set against the working life of the system and the saving it generates rather than a default finance period.
Does battery finance cover installation and electrical works?
Usually. Switchgear, protection, cabling, mounting or foundations and commissioning can normally sit inside the same facility as the battery. Funders take a view on how much of the total is soft cost, which is why an itemised scope of works matters.
Can I refinance a battery system I have already paid for?
In many cases yes, provided the installation is recent, properly invoiced and the equipment is identifiable. Refinance releases the capital back into the business and spreads the cost over a term, which suits businesses that paid cash to hit an installation window.
Is battery storage finance available to businesses with a loss on the accounts?
It can be, where there is a clear explanation and evidence behind the numbers. We have placed significant equipment orders for businesses carrying a recent loss by presenting contracted revenue and operating data alongside the accounts. It is not automatic and we will say so early if a case is unlikely to fly.
How long does it take to get a funding decision on a battery project?
An indicative view usually comes back within one working day. Full documentation typically follows within a few days once supporting information is in, though staged projects take longer because the funder is reading a build programme rather than a single invoice.