Farmhouse and farm on one connection: who pays what?

Keep one connection, measure the house separately behind the meter, and let one system serve both. A semi off-grid system runs the farm and the house on solar power and a battery. It calls on the grid like a generator when the battery runs low. The accountant gets clean figures, and the grid connection stays the size it is.

You live on the farm, and the farm runs on the same meter as your kitchen. The accountant asks what share of the electricity bill is private. You give a rough guess, because nobody knows. Meanwhile the farm grows: a bigger milk cooler, a feed robot, a heat pump in the house, an electric car at the door. One installer on a forum put it simply. A 3x80 A connection is "what you often see at a house with a big farm shed behind it".

What most farming families do not see is that the house and the farm are one customer for the grid. They share one peak, one capacity tariff and one limit. The private share is not written anywhere, so the business either pays too much or too little. Both are a problem when the tax office asks. And the obvious fix, a second connection for the house, costs more every year than most people expect.

A farm in Tielt needed more power to expand, and medium voltage was the proposed route. Its semi off-grid system, with 45 kVA and a 123.20 kWh battery, made a heavier connection unnecessary. The grid now serves only as a charger, and the farm takes about 5% of its yearly use from it. A fast-growing dairy farm in Lokeren avoided medium voltage with solar panels, a wind turbine and a battery.

Why do the farmhouse and the farm share one connection?

Because that is the standard. Synergrid, the federation of Belgian grid operators, lists a farm (stables, meadow) as one connection cable with one meter room.

A separate cable is only possible on request. The part must be a separate cadastral parcel without its own connection, with its own inspected installation. The grid operator can accept exceptions, but it decides case by case. So on most farms the house was never a separate customer. It grew together with the business, on the same meter.

Does your site already have two connections, for example one on the house and one on a newer shed? Then the question is the opposite one. Our article on one battery for two grid connections covers that case.

Who pays what when the house and the farm share one meter?

The supplier sends one bill to one contract holder. Everything after that is your own bookkeeping. Three things depend on your set-up: the VAT rate, what the business may deduct, and how the tax office sees the private share.

The common thread: the rules want a private share, and a guess is weak evidence. Whether you run the farm as a sole trader or as a company, your accountant has to split the bill. A measured figure makes that split easy to defend.

How do you split the electricity costs of the house and the farm?

Measure the house, not the farm. The house is usually the smaller and simpler part, with fewer circuits to meter.

A private sub-meter is not a meter of the grid operator. It plays no role in your bill from the supplier. It only tells you, and your accountant, how many kWh went to the house. With a battery system you often get this for free: good monitoring shows what each group of circuits uses and produces.

Does the house push up the capacity tariff of the farm?

Yes, when their peaks fall in the same quarter of an hour. In Flanders the capacity tariff is billed per meter, on the monthly quarter-hour peak of everything behind it.

The grid operator takes the highest quarter-hour of each month and averages those peaks over twelve months. In 2026 one kW costs on average about 53.39 euro a year, excluding VAT, with a minimum of 2.5 kW. The meter does not know which part is private. A heat pump, an oven and a car charger in the house count the same as the milk cooler in the barn.

In this example the evening milking and the evening cooking overlap. That overlap sets the monthly peak. Take a farm peak of 18 kW and a house peak of 9 kW, as an example. If both fall together the meter sees 27 kW; if the house waits, it sees 18 kW.

At the 2026 average that difference of 9 kW is worth about 480 euro a year, excluding VAT. Our guide to calculating the capacity tariff for a business shows how to read your own quarter-hour data. In Wallonia and Brussels the tariff structure is different, but there too the house and the farm share one bill.

Should you split the connection into one for the house and one for the farm?

Usually not. A second connection gives two clean bills, but it doubles the fixed costs and separates two parts of the site that help each other.

• Two capacity tariffs. In Flanders each meter pays at least the minimum of 2.5 kW. That is about 133 euro a year at the 2026 average, even for a meter that hardly uses power.
• Two contracts and two sets of fixed fees. Each connection has its own supplier contract and its own fixed network costs.
• No shared solar power. Panels on the barn roof then feed the farm meter only. The house buys power in the evening while the barn injected it at noon.
• No guarantee. On a farm parcel the grid operator starts from one connection; a second one is a request, with a study and a quote.

A split makes sense in a few cases. For example, when the house is sold or rented to someone outside the business. Or when it stands on a separate parcel and gets its own address. Then the house becomes another customer, and a separate connection is the clean answer. For a family that lives and works on the same farm, measuring behind one meter is usually enough.

Can one battery serve both the house and the farm?

Yes, as long as both sit behind the same meter. The battery sees the total and does not care which part of the site asks for power.

That is where the shared connection turns into an advantage:

• One lower peak. The battery covers the evening overlap of milking and cooking, so the joint peak stays down.
• Solar power where it is needed. Panels on the barn roof charge the battery at noon; the house and the evening milking use it later.
• More power than the connection gives. On a farm that grows, the battery adds power on top of the connection, like in Tielt.
• Back-up for chosen circuits. Stable ventilation, milk cooling and the heating of the house can stay on during a power cut.

Our semi off-grid systems are built for a standard 3x400 V + N connection, for powers up to 63 A. Larger farms need a business battery: our modular systems go up to 1 MW. For the farm side of the choice, read our article on the energy system of a livestock farm. For the stables in a power cut, see emergency power for barn ventilation.

Who buys the battery is a tax question too. If the business buys it, the investment deduction only covers the professional use. Our article on tax deductions and subsidies for a business battery explains the rules. The same sub-meter that splits the bill also shows how much of the battery serves the house.

Is the house the only part you want to back up? Then a home battery with emergency power may be enough. Our article on a home battery with back-up power compares the options.

Which set-up fits your farm and house?

Start from the quarter-hour data of the meter and one question: will the house stay part of the business?

When is this article not for you? If your site already has two connections, read our article on one battery for two connections. If the house belongs to a tenant or a buyer, the split is a legal matter first, not a technical one.

How do we look at a farm with the house on the same connection?

We start from what runs when, in the barn and in the house. Every installation is calculated technically and matched to your consumption, production and future plans.

1. Step 1: Analysis and sizing. We read the quarter-hour data of the meter and list the heavy loads of the farm and of the house.
2. Step 2: Technical design. Where the battery and the solar panels go, which circuits get back-up, and how the house is measured.
3. Step 3: Installation and commissioning.
4. Step 4: Monitoring and support, so you see what the farm and the house each use and produce.