ELSAMPROJEKT Polska Sp. z o.o. (limited liability company) is a daughter company of the Danish DONG Energy A/S, founded in 2006 when six Danish energy companies merged: DONG, Elsam, ENERGI E2, Nesa, Copenhagen Energy, and Frederiksberg Forsyning. The merger brought together a wide breadth of experience, resources, and activities, including oil and natural gas exploration and production, electricity generation at power stations and renewable energy facilities, gas and electricity distribution, sales and energy consulting.

Before DONG Energy A/S was established, Elsamprojekt Polska was a subsidiary of Elsam Engineering A/S, which for over 30 years provided engineering and consultancy services for Danish and international energy sector. As part of the merger, Elsam Engineering was incorporated into the new company DONG Energy A/S.