Herøya

Herøya is a peninsula in the municipality of Porsgrunn, Norway. It is located between the fjords of Frierfjord to the west and Gunneklevfjord to the east, at the mouth of Telemarksvassdraget. The name stems from the Old Norse word "her-eyjar" meaning an island with a hord or army , thus "the crowded island".

The peninsula features a large industrial park that was founded in 1928 and contains major facilities of Norsk Hydro, Yara, and REC . The area is served by the Bratsberg Line. 2,700 people work on the 1.5 km² peninsula that has about 30 companies, most of which are subsidiaries of Norsk Hydro, including Hydro's research park with 350 employees. A populated area south of the peninsula itself, which was initially housing for the Hydro employees, is also considered part of Herøya as a suburb of the city of Porsgrunn.

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