ACER received responses from the following organisations:
- BBL Company VOF (BBLC)
- BDEW - German Association of Energy and Water Industries
- EDF
- Edison SPA
- ELPEDISON SA
- Enagas
- Energinet
- Energy Traders Europe
- Eni S.p.A.
- ENTSOG
- European Energy Exchange (EEX)
- Europex
- FGSZ Natural Gas Transmission
- FNB Gas e.V.
- Gas Connect Austria GmbH
- Gasunie Transport Services B.V.
- GRTgaz
- Interconnector Ltd
- National Gas Transmission
- OMV Gas Marketing & Trading GmbH
- Operator Gazociągów Przesyłowych GAZ-SYSTEM S.A. (GAZ-SYSTEM)
- Orlen S.A.
- PRISMA European Capacity Platform GmbH (PRISMA)
- Proxigas
- REN Gasodutos, SA
- RWE Supply & Trading
- SEFE Marketing & Trading
- Teréga
- Uniper Global Commodities SE