How it started
History
Energinet was created by a merger of power grid operators Eltra, Elkraft System and Elkraft Transmission, and by natural gas transmission system operator Gastra. The merger took place on 24 August 2005 with retrospective effect from 1 January 2005.
Eltra owned the electricity transmission network west of the Great Belt and was system operator there. It was owned by 44 network companies there. To the east of the Great Belt there were two companies: the system operator Elkraft System and the transmission network company Elkraft Transmission. They formed a joint organization and were owned by NESANET A/S, KE Forsyningen, SEAS Transmission A/S, NVE Net A/S, Frederiksberg Elnet A/S, Hillerød Elforsyning, Helsingør Elforsyning, Roskilde Netvirksomhed, Nykøbing Sjællands El-Net and SK-Net A/S.
From Wikipedia’s article on Energinet, shared under CC BY-SA 4.0.2