Ilkka Niiranen

Gren Eesti AS is an Estonian company that goes by the name Gren. The private company is based in Estonia, specifically in Parnu, and has subsidiaries in Lithuania, United Kingdom and Estonia. The company has a simple and friendly introduction on their website that says "hi, we are now gren. welcome, we are gren!" Ilkka Niiranen has been the CEO of the company since 2021.

Gren Latvija SIA engages in the production of district heating and electricity. It also provides heat distribution and sales. The company was founded on December 12, 2014 and is headquartered in Jelgava, Latvia.

Gren is a private company based in Helsinki, Finland. Gren's description states that they are a Finnish company called "welcome, we are gren!" Ilkka Niiranen has been the CEO of the company since 2021.

Gren Holding Co. BV is an investment holding Dutch company. The private company is based in Amsterdam, Netherlands.

Adven Sweden AB provides heating and cooling solutions. It serves real estate and municipality owned properties for heating and cooling requirements from geothermal heat and solar and bio energy. The company was founded in 2014 and is headquartered in Stockholm, Sweden.