Grid congestion in Flanders by region: where is it worst?

Almost everywhere. On the Fluvius map of 15 September 2026, about 81% of the Flemish area is orange. The Kempen, the Mechelen area, the coast and the Ghent canal zone are orange almost everywhere. West Flanders and Limburg have the largest yellow and green pockets. But the map is about extra power on medium voltage, from around 100 kVA. A site that can stay on its street connection, up to 75.6 kVA, grows faster with a semi-off-grid system. A larger site covers its peaks with a business battery behind the connection it can get.

You run a company in the Kempen, in Limburg or near the coast. You read that "the grid is full" and that companies wait for a connection. A competitor twenty kilometres away seems to have more room. Is your region worse off? Should you expand elsewhere, or wait?

The question comes fast, because the queue grew fast. In March 2025, Fluvius counted 35 files that could no longer be connected in the classic way. In March 2026 it was 1,250, including 600 battery projects, Voka reported. People on forums describe the same feeling: no insight into the waiting time, and a plan that stands still. Choosing a site or freezing a plan on the wrong reading of the map costs months.

Three of our semi-off-grid projects are in West Flanders, in areas that are orange today. A plant nursery in Jabbeke kept its 3 x 400 V, 32 A street connection instead of paying for medium voltage. A farm in Tielt avoided medium voltage for its expansion. A flax processing company in Wielsbeke did not build a large medium-voltage cabin.

How much of each Flemish province is orange on the Fluvius map?

Between 72% and 93%, depending on the province. Flemish Brabant and Antwerp are the most orange, West Flanders the least. We measured this on the Fluvius map of 15 September 2026.

Fluvius publishes the map as an image, without figures per region. So we laid the map over the official borders of Statbel and counted the colours per area. The result is an approximation of the area, rounded. It says nothing about the number of companies waiting.

Remember what the colours mean. Orange means only flexible connections for extra high power. Yellow means a request of 1 MVA or more gets a flexible connection. Green means classic connections are still possible. Our article on how to read the Fluvius congestion map explains the legend and the step-by-step check.

Why is the Kempen almost entirely orange?

Because nearly every power supply area in the Kempen is orange: about 98% of the area. Only a small green pocket near the Limburg border breaks the picture.

We take the Kempen here as the arrondissement of Turnhout. Extra demand from companies there lands on transformer stations that Fluvius already expects to be congested by 2035.

For a company in the Kempen, the practical rule is simple. Assume that any request for extra power on medium voltage will get a flexible offer. Plan the project so that it still works when Fluvius limits your power for a while. Fall-Back Flex gives you the full power, but Fluvius may limit it temporarily at exceptional peaks. Our article on what to do when Fluvius refuses a heavier connection explains how that works.

Is there grid congestion in Limburg, and where are the yellow pockets?

Yes: about 77% of Limburg is orange, but 22% is yellow, more than in most provinces. The yellow areas lie in the centre, in the north-east and in the south, in the Haspengouw.

Yellow is not a free pass. It means a company that asks for 1 MVA or more of extra power still gets a flexible connection. Smaller requests for extra power can still get a classic connection there, according to the Fluvius legend.

The problem is already concrete for Limburg companies. In early 2026, Voka Limburg estimated that about 20 companies in the province had trouble getting a connection. Across Flanders it knew of about 184 projects that could no longer be connected in the classic way.

Farms feel it too. In March 2026, VILT reported fruit growers who were told that Fluvius could not send an offer for a heavier cabin yet. Fluvius said this is not a refusal: the customer can wait or stop the file. Our article on frost protection in orchards covers the fruit growers of the Haspengouw.

West Flanders: why is the coast orange and the Westhoek yellow?

West Flanders has the most yellow and green of all provinces, about 28% together, but most of its coast is orange. Within the province, the picture changes from one area to the next.

The pressure is real. In March 2026, Voka West-Vlaanderen wrote that dozens of projects in the province could no longer be connected in the classic way. It asked the Flemish government to make sure Ventilus is built on time.

Ventilus is the new 380 kV high-voltage line of Elia, about 85 km long, between Bruges and the existing grid near Izegem and Avelgem. It must bring power from the wind farms in the North Sea inland. The Flemish government fixed its spatial plan in March 2024. Until such lines are ready, companies grow within what the local grid can take.

West Flanders also has the most business batteries on the Fluvius medium-voltage grid: 481 of about 1,230 in Flanders, according to Fluvius open data. Fluvius names industrial batteries, data centres and electrification as the extra pressure on its grid.

Are the port zones the first to be full?

Not all of them. On the Fluvius map, the Ghent canal zone and the area around Zeebrugge are orange. The northern port of Antwerp on the right bank is mostly yellow, with some green.

There is a catch. The largest industrial sites in the ports are often connected directly to the high-voltage grid of Elia. The Fluvius map does not cover them. For a logistics company or workshop on the Fluvius grid in a port zone, the map is the right starting point.

The business organisations want priority for these zones. Voka asks that industrial electrification in industrial and port zones gets priority when grid capacity is allocated. Alfaport Voka, for the port of Antwerp, brought port input into that paper. Charging electric trucks is one of the loads that pushes logistics sites into this question. Our article on charging electric trucks at your depot looks at that case.

Does it help to move your project to a yellow or green area?

Rarely. A yellow or green area today is not a promise for your address, and the colours change every month.

Four facts limit what the map can tell you about a location:

• The areas follow transformer stations, not municipal borders. Two sites a few kilometres apart can fall in different areas.
• The colours are a forecast for 2035. Fluvius says there is no actual grid congestion in Flanders today, only expected congestion.
• The map is indicative. The Elia grid upstream can still change the answer, even in a green area.
• It is updated around the 15th of every month. A yellow pocket can turn orange when large requests come in.

The rules are also moving. In April 2026, the Flemish regulator eased the conditions for Fall-Back Flex. Fluvius said this would allow about 760 files to be connected flexibly in congestion zones. A grid study is still the only way to know what your site will get. Our article on the Fluvius grid study explains when you need one.

How can a business grow in an orange region?

Plan on the power you are sure of, and cover the rest on your own site. The region does not change the method, only how likely a flexible answer is.

Our West Flemish projects show the first two lines. In Jabbeke, the street connection stayed at 32 A and now charges a system that delivers 63 A to the irrigation pumps. In Tielt, the farm is expected to take only about 5% of its yearly use from the grid.

In Wielsbeke, a flax processing company would have needed a large medium-voltage cabin. A generator starts the flax machine and keeps running during work. Loading it a little more to charge the batteries covers the rest of the day. Our article on the start-up current of a heavy machine explains the physics.

What happens when you ask us to look at your site?

We start from what your site draws and when, not from the colour of your region.

1. Step 1: Analysis and sizing. Where possible we first measure your consumption for a period, so the peaks and the energy per day are known.
2. Step 2: Technical design. We compare your plan with the connection you have or can get. Then we tell you whether a battery, a semi-off-grid system or a heavier connection is the honest answer.
3. Step 3: Installation and commissioning.
4. Step 4: Monitoring and ongoing support. You follow consumption, yield and the battery level in real time.