Nelja Energia AS (also branded as 4Energia) is a renewable energy developer based in Tallinn, Estonia.

The main areas of business of the company are the development of the renewable energy industry and the operation of power production.

[citation needed] Nelja Energia owns and operates eleven wind farms in Estonia with the total capacity of 140.8 MW, and four wind farms in Lithuania with the total capacity of 78.9 MW.

[5] In Latvia, it owns and operates a cogeneration plant and pellet factory in Brocēni.

In 2012, Freenergy merged with Nelja Energia and the current ownership structure was adopted.