| Austria | https://www.e-control.at/ E-control |
| Belgium | http://www.creg.be Commission de Régulation de l'Electricité et du Gaz (Commission for Electricity and Gas Regulation) |
| Bulgaria | http://www.dker.bg/ Комисия за енергийно и водно регулиране (Energy and Water Regulatory Commission) |
| Croatia | https://www.hera.hr Hrvatska Energetska Regulatorna Agencija (Croatian Energy Regulatory Agency) |
| Cyprus | https://www.cera.org.cy/ Ρυθμιστική Αρχή Ενέργειας Κύπρου (Cyprus Energy Regulatory Authority) |
| Czechia | http://www.eru.cz Energetický regulační úřad (Energy Regulatory Office) |
| Denmark | http://energitilsynet.dk/ Energitilsynet (Energy Regulatory Authority) |
| Estonia | http://www.konkurentsiamet.ee Konkurentsiamet (Estonian Competition Authority) |
| Finland | http://www.energiavirasto.fi/ Energiavirasto (Energy Authority) |
| France | http://www.cre.fr/ Commission de Régulation de l'Energie (Regulatory Commission of Energy) |
| Germany | https://www.bundesnetzagentur.de Bundesnetzagentur (Federal Network Agency) |
| Greece | http://www.rae.gr Ρυθμιστική Αρχή Ενέργειας (Regulatory Authority for Energy) |
| Hungary | www.mekh.hu Magyar Energetikai és Közmű-szabályozási Hivatal (Hungarian Energy Office) |
| Ireland | https://www.cru.ie/ Commission for Regulation of Utilities |
| Italy | www.arera.it Autorità di Regolazione per Energia Reti e Ambiente (Regulatory Authority for Electricity, Gas and Water) |
| Latvia | https://www.sprk.gov.lv/ Sabiedrisko pakalpojumu regulēšanas komisija (Public Utilities Commission) |
| Lithuania | http://www.vert.lt Valstybinė energetikos reguliavimo taryba (National Energy Regulatory Council) |
| Luxembourg | http://www.ilr.lu Institut Luxembourgeois de Régulation (Luxemburger Regulatory Institute) |
| Malta | https://www.rews.org.mt Regulator for Energy and Water Services |
| The Netherlands | https://www.acm.nl/nl Autoriteit Consument Markt (Authority for Consumers and Markets) |
| Poland | http://www.ure.gov.pl/ Urząd Regulacji Energetyki (Energy Regulatory Office) |
| Portugal | http://www.erse.pt/ Entidade Reguladora dos Serviços Energéticos |
| Romania | http://www.anre.ro/ Autoritatea Nationala de Reglementari in domeniul Energiei (Energy Regulatory Authority) |
| Slovakia | http://www.urso.gov.sk Úrad pre reguláciu sieťových odvetví (Regulatory Office for Network Industries) |
| Slovenia | https://www.agen-rs.si/ Agencija za energijo (Energy Agency) |
| Spain | https://www.cnmc.es/ Comisión nacional de los mercados y la competencia |
| Sweden | http://www.ei.se Energimarknadsinspektionen (Energy Markets Inspectorate) |