Ranking · Wallonia · NACE 35
Electricity, gas, steam and air conditioning supply: the largest companies in Wallonia
As of 14 Nov 2026, 276 companies in Electricity, gas, steam and air conditioning supply (NACE 35) in Wallonia publish total assets in recent accounts (financial years 2023 to 2026). The top 10 account for €12.0bn, out of €13.9bn for all of them; median total assets are €1.55m. ORES Assets leads with €5.23bn (financial year 2025).
Top 50 · Electricity, gas, steam and air conditioning supply · Wallonia
Ranked by total assets in the latest filed accounts. This is a size criterion, not an assessment.
| # | Company | Total assets | Revenue | Equity | FTE | Year |
|---|---|---|---|---|---|---|
| 1 | ORES Assets 6041 Charleroi | €5.23bn | €1.16bn | €2.07bn | — | 2025 |
| 2 | Operateur de Reseaux d'Energies 6041 Charleroi | €2.83bn | €920.9m | 461,806 € | 3,000.0 | 2025 |
| 3 | RESA 4000 Liège | €2.25bn | €386.4m | €985.6m | 930.6 | 2025 |
| 4 | Eneco Wind Belgium 1300 Wavre | €510.6m | €15.1m | €351.9m | 46.7 | 2025 |
| 5 | TotalEnergies Power & Gas Belgium 4000 Liège | €448.7m | €1.61bn | €65.6m | 181.4 | 2025 |
| 6 | Power Online 4020 Liège | €198.0m | €574.7m | €35.1m | 21.1 | 2025 |
| 7 | Publilec 4100 Seraing | €193.9m | — | €168.3m | 2.3 | 2025 |
| 8 | John Cockerill Hydrogen Belgium 4100 Seraing | €161.9m | €14.3m | €22.0m | 143.2 | 2025 |
| 9 | Eol'Wapi 7500 Tournai | €121.9m | €17.4m | €81.8m | — | 2025 |
| 10 | ActiVent Wallonie 6000 Charleroi | €102.1m | €5.22m | €18.6m | — | 2025 |
| 11 | Reseau d'Energies de Wavre 1301 Wavre | €84.5m | €14.7m | €62.0m | 35.0 | 2025 |
| 12 | Demainvest 4030 Liège | €81.4m | €3.32m | €6.71m | — | 2025 |
| 13 | Association Intercommunale d'Electricité du Sud du Hainaut 6470 Sivry-Rance | €80.3m | €21.3m | €49.8m | 52.7 | 2025 |
| 14 | Green4Power 4000 Liège | €80.1m | €13.0m | €9.37m | — | 2025 |
| 15 | Association Intercommunale d'Etudes et d'Exploitation d'Electricité et de Gaz 5300 Andenne | €74.1m | €20.1m | €49.6m | 45.8 | 2025 |
| 16 | TotalEnergies - Centrale Electrique Marchienne-au-Pont 6030 Charleroi | €66.1m | €134.9m | €36.9m | 39.0 | 2025 |
| 17 | Hegoa Wind 1300 Wavre | €62.2m | €17.9m | €17.6m | — | 2026 |
| 18 | TotalEnergies Integrated Power ESS Belgium 4000 Liège | €59.6m | €4.60m | 401,065 € | — | 2025 |
| 19 | Renewable Power Company 6680 Sainte-Ode | €55.5m | €10.1m | €51.9m | — | 2025 |
| 20 | Bertemes 6690 Vielsalm | €53.5m | €16.3m | €3.65m | — | 2025 |
| 21 | Wind4Wallonia 2 6000 Charleroi | €48.7m | €5.79m | €10.2m | — | 2025 |
| 22 | TotalEnergies Gas & Power Western Europe 4000 Liège | €48.3m | €324.2m | 153,118 € | — | 2025 |
| 23 | Sirocco Wind 1300 Wavre | €38.1m | €7.41m | €11.6m | — | 2026 |
| 24 | Green for Power - Hélios 4000 Liège | €34.5m | — | −€1.21m | — | 2025 |
| 25 | Les Vents de Damre 7500 Tournai | €33.5m | — | 215,530 € | — | 2025 |
| 26 | Gouynrg 7500 Tournai | €30.8m | — | −€1.29m | — | 2025 |
| 27 | Eole Agri Enviro 7500 Tournai | €29.8m | — | 403,288 € | — | 2025 |
| 28 | Clinique Psychiatrique des Frères Alexiens 4841 Welkenraedt | €27.0m | €37.0m | €9.13m | 400.0 | 2025 |
| 29 | Green City Wallonie 3 7330 Saint-Ghislain | €26.1m | €1.56m | €3.80m | — | 2025 |
| 30 | Electrawinds Biomasse Mouscron 7700 Mouscron | €25.7m | 0 € | €10.8m | — | 2025 |
| 31 | Condreole 4122 Neupré | €23.0m | — | €4.25m | — | 2025 |
| 32 | Cinergie 6224 Fleurus | €22.8m | — | €10.3m | 12.1 | 2025 |
| 33 | Energie-Fleuves 4040 Herstal | €21.2m | — | €16.3m | — | 2025 |
| 34 | 2Valorise Amel 4770 Amel | €20.9m | €3.21m | 716,933 € | 20.6 | 2025 |
| 35 | Elawan Energy Salazine 5101 Namur | €19.9m | €2.00m | −272,762 € | — | 2025 |
| 36 | Tabnrg 7500 Tournai | €19.1m | — | €3.56m | — | 2025 |
| 37 | Balteau I.E. 4420 Saint-Nicolas | €18.3m | €30.6m | €7.51m | 130.4 | 2025 |
| 38 | Wind4Wallonia 3 6000 Charleroi | €18.3m | €2.58m | €2.86m | — | 2025 |
| 39 | Biogaz du Haut Geer 4250 Geer | €16.0m | — | €6.35m | 4.9 | 2025 |
| 40 | CORETEC Services 4340 Awans | €15.8m | €4.16m | €1.36m | 3.7 | 2025 |
| 41 | Bayamo Wind 1300 Wavre | €15.6m | — | €10.5m | 4.2 | 2026 |
| 42 | Gebrüder Lenges 4780 Sankt Vith | €15.2m | — | €12.3m | 19.4 | 2025 |
| 43 | Cgnee Belgium Wind Energy Company 7000 Mons | €14.9m | €7.66m | −499,748 € | — | 2025 |
| 44 | Newcastle Wind 1300 Wavre | €14.6m | €2.58m | €3.86m | — | 2026 |
| 45 | Courant d'Air 4750 Bütgenbach | €13.5m | — | €9.97m | 4.1 | 2025 |
| 46 | EolSPI 4000 Liège | €13.2m | — | €1.11m | — | 2025 |
| 47 | Eoliennes de la Fontaine 7500 Tournai | €12.4m | — | 647,943 € | — | 2025 |
| 48 | Vents d'Houyet 5560 Houyet | €12.0m | €2.39m | €2.92m | 2.5 | 2025 |
| 49 | Energie 2030 4730 Raeren | €11.8m | — | €10.6m | — | 2025 |
| 50 | Trans&Wall 5300 Andenne | €11.8m | — | €9.79m | 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.
“—”: 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 activities2,551
- 02 Forestry and logging541
- 03 Fishing and aquaculture31
- 08 Other mining and quarrying121
- 09 Mining support service activities17
- 10 Manufacture of food products1,478
- 11 Manufacture of beverages275
- 13 Manufacture of textiles155
- 14 Manufacture of wearing apparel101
- 15 Manufacture of leather and related products of other materials18
- 16 Manufacture of wood and of products of wood and cork, except furniture; manufacture of articles of straw and plaiting materials442
- 17 Manufacture of paper and paper products57
- 18 Printing and reproduction of recorded media532
- 20 Manufacture of chemicals and chemical products239
- 21 Manufacture of basic pharmaceutical products and pharmaceutical preparations179
- 22 Manufacture of rubber and plastic products196
- 23 Manufacture of other non-metallic mineral products441
- 24 Manufacture of basic metals140
- 25 Manufacture of fabricated metal products, except machinery and equipment1,528
- 26 Manufacture of computer, electronic and optical products210
- 27 Manufacture of electrical equipment185
- 28 Manufacture of machinery and equipment n.e.c.379
- 29 Manufacture of motor vehicles, trailers and semi-trailers114
- 30 Manufacture of other transport equipment56
- 31 Manufacture of furniture278
- 32 Other manufacturing409
- 33 Repair, maintenance and installation of machinery and equipment654
- 36 Water collection, treatment and supply19
- 37 Sewerage67
- 38 Waste collection, recovery and disposal activities297
- 39 Remediation activities and other waste management service activities29
- 41 Construction of residential and non-residential buildings4,193
- 42 Civil engineering477
- 43 Specialised construction activities12,039
- 46 Wholesale trade8,104
- 47 Retail trade12,950
- 49 Land transport and transport via pipelines1,819
- 50 Water transport41
- 51 Air transport53
- 52 Warehousing, storage and support activities for transportation567
- 53 Postal and courier activities126
- 55 Accommodation1,322
- 56 Food and beverage service activities6,704
- 58 Publishing activities410
- 59 Motion picture, video and television programme production, sound recording and music publishing activities595
- 60 Programming, broadcasting, news agency and other content distribution activities69
- 61 Telecommunication130
- 62 Computer programming, consultancy and related activities5,398
- 63 Computing infrastructure, data processing, hosting and other information service activities468
- 64 Financial service activities, except insurance and pension funding3,810
- 65 Insurance, reinsurance and pension funding, except compulsory social security111
- 66 Activities auxiliary to financial services and insurance activities2,334
- 68 Real estate activities12,723
- 69 Legal and accounting activities5,344
- 70 Activities of head offices and management consultancy12,300
- 71 Architectural and engineering activities; technical testing and analysis3,981
- 72 Scientific research and development396
- 73 Activities of advertising, market research and public relations2,471
- 74 Other professional, scientific and technical activities1,209
- 75 Veterinary activities727
- 77 Rental and leasing activities793
- 78 Employment activities299
- 79 Travel agency, tour operator and other reservation service and related activities262
- 80 Investigation and security activities133
- 81 Services to buildings and landscape activities1,907
- 82 Office administrative, office support and other business support activities2,358
- 84 Public administration and defence; compulsory social security39
- 85 Education1,500
- 86 Human health activities14,912
- 87 Residential care activities736
- 88 Social work activities without accommodation561
- 90 Arts creation and performing arts activities659
- 91 Libraries, archives, museums and other cultural activities86
- 92 Gambling and betting activities46
- 93 Sports activities and amusement and recreation activities1,303
- 94 Activities of membership organisations326
- 95 Repair and maintenance of computers, personal and household goods, and motor vehicles and motorcycles1,290
- 96 Personal service activities1,967
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 company in Electricity, gas, steam and air conditioning supply in Wallonia?
By total assets, it is ORES Assets (€5.23bn, financial year 2025).
How many companies in Electricity, gas, steam and air conditioning supply in Wallonia are ranked?
276 out of 278 active companies in the sector with their registered office in the area: those whose latest accounts are less than 3 years old.
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.
Idonis
Analyse companies · Wallonia
Filter these companies by size, soundness and trend, follow them and get an alert when their accounts or publications change.
Open the full file →Free account in 30 seconds, by email. No bank card.
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.