Ranking · Wallonia · NACE 35
Electricity, gas, steam and air conditioning supply: the largest employers in Wallonia
As of 14 Nov 2026, 55 companies in Electricity, gas, steam and air conditioning supply (NACE 35) in Wallonia report employees in recent accounts (financial years 2023 to 2026). The 10 largest employers account for 4,981.4 FTE, out of 5,317.2 for all of them; median headcount is 4.2 FTE. Operateur de Reseaux d'Energies leads with 3,000 FTE (financial year 2025).
Top 50 · Electricity, gas, steam and air conditioning supply · Wallonia
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 | Operateur de Reseaux d'Energies 6041 Charleroi | €2.83bn | €920.9m | 461,806 € | 3,000.0 | 2025 |
| 2 | RESA 4000 Liège | €2.25bn | €386.4m | €985.6m | 930.6 | 2025 |
| 3 | Clinique Psychiatrique des Frères Alexiens 4841 Welkenraedt | €27.0m | €37.0m | €9.13m | 400.0 | 2025 |
| 4 | TotalEnergies Power & Gas Belgium 4000 Liège | €448.7m | €1.61bn | €65.6m | 181.4 | 2025 |
| 5 | John Cockerill Hydrogen Belgium 4100 Seraing | €161.9m | €14.3m | €22.0m | 143.2 | 2025 |
| 6 | Balteau I.E. 4420 Saint-Nicolas | €18.3m | €30.6m | €7.51m | 130.4 | 2025 |
| 7 | Association Intercommunale d'Electricité du Sud du Hainaut 6470 Sivry-Rance | €80.3m | €21.3m | €49.8m | 52.7 | 2025 |
| 8 | Arcade Energy 7090 Braine-le-Comte | 500,713 € | — | −119,170 € | 50.6 | 2025 |
| 9 | Eneco Wind Belgium 1300 Wavre | €510.6m | €15.1m | €351.9m | 46.7 | 2025 |
| 10 | Association Intercommunale d'Etudes et d'Exploitation d'Electricité et de Gaz 5300 Andenne | €74.1m | €20.1m | €49.6m | 45.8 | 2025 |
| 11 | TotalEnergies - Centrale Electrique Marchienne-au-Pont 6030 Charleroi | €66.1m | €134.9m | €36.9m | 39.0 | 2025 |
| 12 | Reseau d'Energies de Wavre 1301 Wavre | €84.5m | €14.7m | €62.0m | 35.0 | 2025 |
| 13 | John Cockerill Energy 4100 Seraing | €5.14m | €4.55m | −847,805 € | 28.2 | 2025 |
| 14 | Infratech 4890 Thimister-Clermont | €7.54m | €11.9m | €5.58m | 21.1 | 2025 |
| 15 | Power Online 4020 Liège | €198.0m | €574.7m | €35.1m | 21.1 | 2025 |
| 16 | 2Valorise Amel 4770 Amel | €20.9m | €3.21m | 716,933 € | 20.6 | 2025 |
| 17 | Gebrüder Lenges 4780 Sankt Vith | €15.2m | — | €12.3m | 19.4 | 2025 |
| 18 | Ingelec 7700 Mouscron | €2.60m | — | €1.07m | 16.9 | 2025 |
| 19 | Val Notre-Dame Internat 4520 Wanze | 606,224 € | €1.00m | 54,343 € | 16.2 | 2025 |
| 20 | Districoal 6060 Charleroi | €4.44m | — | €2.44m | 13.1 | 2025 |
| 21 | Cinergie 6224 Fleurus | €22.8m | — | €10.3m | 12.1 | 2025 |
| 22 | Comptoir Citoyen des Energies 7900 Leuze-en-Hainaut | €8.00m | €30.8m | €3.07m | 10.9 | 2025 |
| 23 | D&B Green Solution 7120 Estinnes | €4.11m | — | €2.38m | 9.0 | 2025 |
| 24 | Cooperative pour les Energies du Futur 7900 Leuze-en-Hainaut | €10.1m | 277,927 € | €8.74m | 6.8 | 2025 |
| 25 | Mont Godinne Green Energy 1348 Ottignies-Louvain-la-Neuve | €4.54m | — | −618,022 € | 5.4 | 2023 |
| 26 | Snow Events International 7780 Comines-Warneton | €3.98m | €1.41m | −33,803 € | 5.3 | 2025 |
| 27 | Biogaz du Haut Geer 4250 Geer | €16.0m | — | €6.35m | 4.9 | 2025 |
| 28 | Bayamo Wind 1300 Wavre | €15.6m | — | €10.5m | 4.2 | 2026 |
| 29 | Courant d'Air 4750 Bütgenbach | €13.5m | — | €9.97m | 4.1 | 2025 |
| 30 | Coolwave 1410 Waterloo | 287,389 € | — | 41,742 € | 4.0 | 2025 |
| 31 | Electricite - Automatisme - Informatique 6001 Charleroi | 278,693 € | — | 223,160 € | 3.8 | 2025 |
| 32 | CORETEC Services 4340 Awans | €15.8m | €4.16m | €1.36m | 3.7 | 2025 |
| 33 | Energy Pool Belgium 1380 Lasne | 587,003 € | — | −178,780 € | 2.7 | 2025 |
| 34 | Vents d'Houyet 5560 Houyet | €12.0m | €2.39m | €2.92m | 2.5 | 2025 |
| 35 | MGElec 5555 Bièvre | 911,593 € | — | 260,027 € | 2.4 | 2025 |
| 36 | Vents du Sud 6700 Arlon | €1.62m | — | €1.54m | 2.4 | 2025 |
| 37 | Publilec 4100 Seraing | €193.9m | — | €168.3m | 2.3 | 2025 |
| 38 | Ochain Energie 4560 Clavier | €5.67m | — | €2.96m | 2.3 | 2025 |
| 39 | Codel 4020 Liège | €10.6m | €26.8m | €2.27m | 2.0 | 2025 |
| 40 | Intelligent Technology Network 4280 Hannut | 120,462 € | 842,607 € | 104,533 € | 1.9 | 2025 |
| 41 | Immo A 4910 Theux | €1.40m | — | 131,800 € | 1.8 | 2025 |
| 42 | Coopérative d’ÉneRgie Liégeoise Citoyenne 4000 Liège | 711,640 € | — | 648,903 € | 1.4 | 2025 |
| 43 | HesbEnergie 1350 Orp-Jauche | €4.69m | — | €3.42m | 1.1 | 2025 |
| 44 | Brassart Eau Douce 1435 Mont-Saint-Guibert | 94,659 € | — | 47,505 € | 1.0 | 2025 |
| 45 | Trans&Wall 5300 Andenne | €11.8m | — | €9.79m | 1.0 | 2025 |
| 46 | Messancy BioMétha 6700 Arlon | €5.51m | — | 305,534 € | 1.0 | 2025 |
| 47 | Enercity 4530 Villers-le-Bouillet | €1.44m | — | €1.40m | 1.0 | 2025 |
| 48 | Reseau de Chaleur Pleiades 4020 Liège | 616,683 € | — | −833,753 € | 1.0 | 2025 |
| 49 | Leclerc-Energie 4608 Dalhem | 518,942 € | — | 161,614 € | 1.0 | 2024 |
| 50 | Emissions Zero 5000 Namur | €8.79m | — | €7.91m | 1.0 | 2025 |
Ranking based on each company's own annual accounts (statutory, not consolidated): a subsidiary and its parent appear separately, and the ranking differs from lists based on consolidated group accounts. Headcount reported by the company for all its sites: the jobs may be located elsewhere.
“—”: not published. Small companies (micro and abridged accounts) do not have to publish their revenue.
Electricity, gas, steam and air conditioning supply across Belgium → All sectors · Wallonia →
Other sectors · Wallonia
- 01 Crop and animal production, hunting and related service activities780
- 02 Forestry and logging194
- 08 Other mining and quarrying77
- 10 Manufacture of food products965
- 11 Manufacture of beverages98
- 13 Manufacture of textiles80
- 14 Manufacture of wearing apparel32
- 16 Manufacture of wood and of products of wood and cork, except furniture; manufacture of articles of straw and plaiting materials221
- 17 Manufacture of paper and paper products44
- 18 Printing and reproduction of recorded media183
- 20 Manufacture of chemicals and chemical products154
- 21 Manufacture of basic pharmaceutical products and pharmaceutical preparations70
- 22 Manufacture of rubber and plastic products140
- 23 Manufacture of other non-metallic mineral products267
- 24 Manufacture of basic metals97
- 25 Manufacture of fabricated metal products, except machinery and equipment863
- 26 Manufacture of computer, electronic and optical products110
- 27 Manufacture of electrical equipment94
- 28 Manufacture of machinery and equipment n.e.c.245
- 29 Manufacture of motor vehicles, trailers and semi-trailers62
- 30 Manufacture of other transport equipment32
- 31 Manufacture of furniture147
- 32 Other manufacturing184
- 33 Repair, maintenance and installation of machinery and equipment290
- 37 Sewerage34
- 38 Waste collection, recovery and disposal activities185
- 39 Remediation activities and other waste management service activities12
- 41 Construction of residential and non-residential buildings1,635
- 42 Civil engineering231
- 43 Specialised construction activities4,772
- 46 Wholesale trade3,106
- 47 Retail trade6,426
- 49 Land transport and transport via pipelines954
- 50 Water transport13
- 52 Warehousing, storage and support activities for transportation248
- 53 Postal and courier activities44
- 55 Accommodation497
- 56 Food and beverage service activities3,655
- 58 Publishing activities116
- 59 Motion picture, video and television programme production, sound recording and music publishing activities117
- 60 Programming, broadcasting, news agency and other content distribution activities19
- 61 Telecommunication45
- 62 Computer programming, consultancy and related activities855
- 63 Computing infrastructure, data processing, hosting and other information service activities56
- 64 Financial service activities, except insurance and pension funding460
- 65 Insurance, reinsurance and pension funding, except compulsory social security30
- 66 Activities auxiliary to financial services and insurance activities976
- 68 Real estate activities1,204
- 69 Legal and accounting activities1,756
- 70 Activities of head offices and management consultancy1,072
- 71 Architectural and engineering activities; technical testing and analysis708
- 72 Scientific research and development141
- 73 Activities of advertising, market research and public relations285
- 74 Other professional, scientific and technical activities118
- 75 Veterinary activities173
- 77 Rental and leasing activities148
- 78 Employment activities145
- 79 Travel agency, tour operator and other reservation service and related activities124
- 80 Investigation and security activities39
- 81 Services to buildings and landscape activities738
- 82 Office administrative, office support and other business support activities285
- 84 Public administration and defence; compulsory social security25
- 85 Education560
- 86 Human health activities1,816
- 87 Residential care activities621
- 88 Social work activities without accommodation415
- 90 Arts creation and performing arts activities144
- 91 Libraries, archives, museums and other cultural activities63
- 92 Gambling and betting activities27
- 93 Sports activities and amusement and recreation activities459
- 94 Activities of membership organisations223
- 95 Repair and maintenance of computers, personal and household goods, and motor vehicles and motorcycles524
- 96 Personal service activities823
Municipalities with the most companies in the sector · Wallonia
- 7500 Tournai (Ere, Saint-Maur)20
- 4000 Liège (Glain, Rocourt)15
- 6220 Fleurus (Heppignies, Lambusart, Wangenies)15
- 1300 Wavre (Limal)10
- 5560 Houyet (Ciergnon, Finnevaux, Hulsonniaux, …)9
- 4750 Bütgenbach (Elsenborn)7
- 1435 Mont-Saint-Guibert (Corbais, Hévillers)6
- 4020 Liège (Bressoux, Jupille-Sur-Meuse, Wandre)5
- 7900 Leuze-en-Hainaut (Grandmetz)5
- 4040 Herstal4
- 4960 Malmedy (Bevercé)4
- 6000 Charleroi4
Frequently asked questions
Which is the largest employer in Electricity, gas, steam and air conditioning supply in Wallonia?
Among companies, Operateur de Reseaux d'Energies, with 3,000 full-time equivalents reported (financial year 2025).
Are all the jobs located in the area?
Not necessarily: headcount is reported by the company for all its sites, and the company is ranked by the address of its registered office. 55 out of 278 companies in the sector report employees there.
Why does this ranking differ from other lists?
It uses each company's annual accounts as filed with the National Bank, not consolidated group accounts. A holding, a subsidiary or a purchasing entity can therefore appear separately. Only companies whose latest accounts are less than 3 years old are ranked.
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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 14 Nov 2026.