| KSS Lämpö Oy CVR 0161040-9 | BoardChairperson | Since 2021 | — | Active |
| EPV Energia Oy CVR 0216734-9 | OtherDeputy Member | Since 2026 | — | Active |
| Kymin Voima Oy CVR 0763405-7 | BoardBoard of Directors | Since 2021 | — | Active |
| KSS Energia Oy CVR 0877511-8 | ManagementChief Executive Officer | Since 2021 | — | Active |
| Suomen Voima Oy CVR 1000864-7 | BoardBoard of Directors | Since 2023 | — | Active |
| Voimakymi Oy CVR 1008027-8 | BoardChairperson | Since 2021 | — | Active |
| Suomen Energia-Urakointi Oy CVR 1108971-7 | BoardChairperson | Since 2021 | — | Active |
| KSS Rakennus Oy CVR 1654027-1 | BoardChairperson | Since 2021 | — | Active |
| Kymppivoima Hydro Oy CVR 2091410-9 | BoardBoard of Directors | Since 2021 | — | Dissolved |
| SV Vesivoima Oy CVR 2380402-8 | BoardBoard of Directors | Since 2021 | — | Active |
| Karhu Voima Oy CVR 2769659-7 | BoardChairperson | Since 2021 | — | Active |
| Piipsan Tuulivoima Oy CVR 3156718-1 | BoardBoard of Directors | Since 2021 | — | Active |
| SV Power Procurement Oy CVR 3165743-5 | BoardChairperson | Since 2022 | — | Active |
| SV Vaaranlammet Oy CVR 3559298-2 | BoardChairperson | Since 2025 | — | Active |
| SV Kapusta Oy CVR 3559302-9 | BoardChairperson | Since 2025 | — | Active |