Electricity, gas, steam and air conditioning supply: largest employers
198 Belgian companies in the sector (NACE 35) report employees in recent accounts; here are the top 20. Fluvius System Operator leads with 5,326.3 FTE (financial year 2025).
Top 20
Ranked by average headcount (FTE) reported in the latest filed accounts (accounts less than 3 years old).
| # | Company | Total assets | Revenue | Equity | FTE | Year |
|---|---|---|---|---|---|---|
| 1 | Fluvius System Operator 9090 Merelbeke-Melle | €10.2bn | €2.90bn | €993.8m | 5,326.3 | 2025 |
| 2 | Electrabel 1000 Brussels | €20.5bn | €13.1bn | €10.2bn | 4,261.0 | 2025 |
| 3 | Operateur de Reseaux d'Energies 6041 Charleroi | €2.83bn | €920.9m | 461,806 € | 3,000.0 | 2025 |
| 4 | Brussels Network Operations 1000 Brussels | €30.3m | €142.7m | 23,229 € | 1,201.7 | 2025 |
| 5 | Luminus 1210 Saint-Josse-ten-Noode | €2.37bn | €3.12bn | €772.5m | 1,181.2 | 2025 |
| 6 | Elia Asset 1000 Brussels | €7.19bn | €963.7m | €1.73bn | 999.9 | 2025 |
| 7 | RESA 4000 Liège | €2.25bn | €386.4m | €985.6m | 930.6 | 2025 |
| 8 | Fluxys Belgium 1040 Brussels | €2.27bn | €722.2m | €399.7m | 918.5 | 2025 |
| 9 | Elia Transmission Belgium 1000 Brussels | €10.5bn | €1.52bn | €3.86bn | 611.6 | 2025 |
| 10 | Clinique Psychiatrique des Frères Alexiens 4841 Welkenraedt | €27.0m | €37.0m | €9.13m | 400.0 | 2025 |
| 11 | Eneco Belgium 2800 Mechelen | €361.8m | €1.21bn | €128.4m | 244.0 | 2026 |
| 12 | ABB 1831 Machelen (Brab.) | €113.3m | €207.0m | €32.4m | 233.6 | 2025 |
| 13 | Parkwind 3000 Leuven | €512.6m | €47.4m | €484.8m | 189.8 | 2025 |
| 14 | TotalEnergies Power & Gas Belgium 4000 Liège | €448.7m | €1.61bn | €65.6m | 181.4 | 2025 |
| 15 | John Cockerill Hydrogen Belgium 4100 Seraing | €161.9m | €14.3m | €22.0m | 143.2 | 2025 |
| 16 | Balteau I.E. 4420 Saint-Nicolas | €18.3m | €30.6m | €7.51m | 130.4 | 2025 |
| 17 | Coreso 1000 Brussels | €45.3m | €50.7m | €8.66m | 110.8 | 2025 |
| 18 | Advario GAS Terminal 9130 Beveren-Kruibeke-Zwijndrecht | €496.8m | €74.0m | €199.2m | 66.4 | 2025 |
| 19 | Elindus 8790 Waregem | €86.7m | €382.6m | €19.3m | 54.1 | 2025 |
| 20 | Association Intercommunale d'Electricité du Sud du Hainaut 6470 Sivry-Rance | €80.3m | €21.3m | €49.8m | 52.7 | 2025 |
Headcount reported by the company for all its sites: the jobs may be located elsewhere.
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Frequently asked questions
Who is the largest employer in Electricity, gas, steam and air conditioning supply?
Fluvius System Operator, with 5,326.3 full-time equivalents reported (financial year 2025).
How many Electricity, gas, steam and air conditioning supply companies report employees?
198 out of 1,060, in accounts less than 3 years old.
Analyse companies in Electricity, gas, steam and air conditioning supply
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Open the full file →Active companies (legal entities) that have filed at least one set of annual accounts, based on the Crossroads Bank for Enterprises and the National Bank of Belgium. The sector is the main activity in the register; the municipality is that of the registered office. Data updated on 13 Nov 2026.