How should a company finance a battery? Buy or lease

If the numbers work and you can fund it, buying is usually the cheapest way over the life of the battery. You keep all the savings and the deductions. Leasing spreads the cost and suits companies that want to keep cash free. A third-party investor or pay-per-use deal needs no upfront money, but you share the savings for ten years or more. Start from a well-sized business battery and a clear savings case. Then choose the financing.

Maybe a salesperson told you it costs "only a few hundred euro a month" and pays for itself. Or an energy company offered a battery "without any investment". On forums, buyers describe the same pitch: "only 140 euro a month", and then "you are stuck with it for 15 years". Others simply ask whether a rented system is a good deal when the rent adds up to many times the hardware price.

What those offers rarely show is where the money goes. A battery earns its keep on your meter: lower peaks, more of your own solar power used, less grid cost. Whoever owns it decides who keeps that money. A monthly fee can look small next to your bill and still add up to far more than buying. Waiting costs money too: every month without a battery is a month of peaks you keep paying for.

A dairy farm in Lokeren shows why ownership matters. Instead of paying for medium voltage, it invested in solar panels, a wind turbine and a battery system. The investment is recouped within 4 years, because no medium voltage is needed and the system is the farm's own property.

What are the ways to finance a business battery?

A company can finance a battery in five ways: own cash, a loan, a financial lease, an operational lease (renting), or a third-party investor. The investor is paid per use or from the savings. They differ in who owns the battery, who keeps the savings and what shows on your balance sheet.

The rest of this article goes through each route: when it fits, what it costs you in savings, and what to check before you sign.

Is buying a business battery with cash or a loan the best choice?

Buying a business battery is the best choice when the battery pays back well within its life and you can fund it. You own the asset, you keep every euro it saves, and you claim the tax deduction yourself.

For most companies the battery earns money in three ways. It cuts the monthly peak that sets your capacity tariff, it stores your own solar power, and it can shift use to cheaper hours. Our guide on how the capacity tariff for businesses is calculated shows what a lower peak is worth. When those savings are yours, a payback of a few years turns into many years of pure profit.

You do not have to pay it all from your own account. A bank investment loan is the classic route. There are also public loans for green investments:

• Flanders: the PMV Ecoboostlening, a subordinated loan for SMEs that lists batteries and solar panels. Our article on subsidies and tax deductions for a business battery explains the conditions, together with the increased investment deduction.
• Wallonia: Wallonie Entreprendre offers the Easy'Green loan, up to 1 million euro per project, for energy efficiency and renewable energy. The smaller Easy'Green Online loan lists a storage battery by name. It lends up to 75,000 euro at a fixed 2.5% over at most 10 years, next to a bank loan.
• Brussels: finance&invest.brussels offers ENERGY&RENO for self-employed people and small businesses: 10,000 to 150,000 euro at a fixed 2% over at most 7 years. Its list names solar panels but not batteries, so ask whether storage qualifies.

How does leasing a business battery work?

With leasing, a leasing company buys the battery and you pay a monthly or quarterly fee to use it. In Belgium there are two kinds, and they are treated very differently in your accounts.

These criteria come from the Belgian Commission for Accounting Standards (CBN). So a financial lease does not keep a battery off your balance sheet: only an operational lease does. If that is the reason you want to lease, ask your accountant which kind the contract really is.

A lease can still go together with the investment deduction, but who claims it depends on the contract. The FPS Finance rules exclude assets bought to lease them out, with exceptions. Check it with your accountant before you sign, and read our article on subsidies and tax deductions for the conditions of the deduction itself.

What is a third-party investor or pay-per-use battery?

With a third-party investor, another company pays for the battery, owns it and usually maintains it. You pay nothing upfront, and in return you share the savings or pay a fee for the use. In French this is called tiers-investissement.

The model is well known for solar panels. Homegrade, the Brussels housing advice centre, describes it like this: the investor pays for the installation and stays the owner for 10 years. You get the benefit of the energy produced. After those 10 years you become the owner, often for a symbolic 1 euro. In Wallonia, Wallonie Entreprendre and Luminus run Demainvest. It builds and operates energy projects for companies and finances a large part of them.

The price of "no investment" is the share of the savings you give away, for as long as the contract runs. On a battery that pays back in four years, a ten-year sharing deal can cost you more than the battery itself.

Some offers also let the investor trade the battery's flexibility on the electricity markets. That can lower your fee. It also means the battery is not always available for your own peaks or as back-up when you need it. Our guide on whether a business battery can earn money on the balancing market explains how that trading works.

Buy, lease or pay per use: which one fits your company?

Choose the route by what matters most to you: the lowest total cost, cash in the bank, or no risk at all. Each route fits a different company.

Want to buy or lease a business battery? The sizing comes first either way. A battery that is too big wastes money under any contract, and one that is too small never delivers the savings you pay for.

What should you check in a battery lease or pay-per-use contract?

Check six things in any battery lease or pay-per-use contract: the term, the end, the control, the performance, the maintenance and the exit. These decide whether the deal still works in year eight.

When is financing a battery not the answer?

Financing is not the answer when the battery itself does not pay back. A lease or an investor spreads the cost; it does not create savings that are not there.

That happens when the peaks are small or there is little solar power to store. It also happens when the battery is sized on a sales story instead of measured data. Measure first, then size, then finance. Our guide on peak demand for businesses shows how to read your own peaks. Where a connection upgrade is the real problem, a battery can also avoid a cabin, as in Londerzeel and Lokeren. Then the avoided cost belongs in the calculation too.

How do we help you decide?

We start with the numbers the financing depends on: your consumption, your peaks and the right size of battery. That is the same analysis a bank, a leasing company or your accountant needs.

1. Step 1: Analysis and sizing. If data is missing, we can measure your consumption for a period first.
2. Step 2: Technical design, matched to your consumption, production and future plans.
3. Step 3: Installation and commissioning.
4. Step 4: Monitoring and support, with monitoring, control and optimisation included on high-power installations up to 1 MW.

With a clear design and savings case in hand, you can compare buying, a loan and a lease on the same basis.