Herøya is a peninsula in the municipality of Porsgrunn. 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 word "hare" because the large number of these that is said to have inhabited the previous island ("øya").

The peninsula features a large industrial park that was founded in 1928 and contains major facilities of Norsk Hydro, Yara, and REC (ScanWafer subsidiary). The area is served by the railway line Bratsbergbanen. 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.

Herøya also has a local football club, participating in the Norwegian 6th division. The club stadium, Herøya Stadion, has a capacity in surplus of 2000.


Originally an island that was used for agriculture, in 1928 Norsk Hydro decided to locate a new artificial fertilizer factory there, Hydro Porsgrunn, and in just 16 months both this factory and a shipping port for Norwegian saltpeter (calcium nitrate) were built. In the process, the narrow sound between the island and the mainland was mostly filled up, thus transforming the island to a peninsula. The reason Hydro wanted to establish itself in the Grenland region was the proximity to limestone, one of the necessary components in the fertilizer, Calcium nitrate. Norsk Hydro had previously had to build its fertilizer plants in Notodden (in 1907) and Rjukan (in 1909) because technology at that time didn't allow for efficient transport of electricity long distances from the power plants to the place of use. But in the 1920s technology had developed and it was possible to locate the plants close to the natural resources instad of close to the hydro electric power plants, that were located in the mountains in Northern Telemark. [cite web |url=http://www.hydro.com/no/about/history/1917_1928/1928.html |title=Nærmere markedet –etablering ved havet |author=Norsk Hydro |language=Norwegian ]

Another important function was the establishment of a port for the export of fertilizer from Norsk Hydro's plants in Telemark. The Telemark Canal had been used for transport from Notodden from the start of operations there, while a railway, Rjukanbanen, had been built to the plant in Rjukan to Notodden. In 1916 this railway was extended as Bratsbergbanen to Skien, and then to Herøya when it opened, replacing the need for the canal. Since then there has been opened other plants at Herøya, including a production plant for PVC (in 1951).

Following the occupation of Norway by Nazi Germany in April 1940 the German occupying force had plans to build Aluminium and Magnesium plants in Herøya. The construction of the plant by Norsk Hydro in partnership with the Luftwaffe-operated "Nordische Aluminium Aktiengesellschaft" (Nordag) was however ended on July 24, 1943 when a bombardment by American B-17 Flying Fortresses completely destroyed the facilities, killing 55 construction workers. Later, in the fifties, Hydro would take up these plans and build a magnesium factory, which was rebuilt in 2002 to a metal recycling facility.

Post-WWII Herøya

In the reminiscing book "UT. Fra en oppvekst i forrige århundre" by historian Harald Berntsen, portrayals are given of incidents and milieus in Herøya, from the time when his family moved there in 1951 (from downtown Porsgrunn), just before he was to begin school, and until 1960. The book explains among other things the way in which the different residential areas in Herøya were related to status and hierarchy in the Hydro community. Berntsen's family lived in a flat on Torggata, on the peninsula proper, to the west of the Gunneklevfjord, in a recently built 4-flat house which the father had been given by Hydro.


"On both sides of Torggata up on the right, one 'owned home' after the other, within well-groomed gardens fenced in with chain link fences and gates ... In front of the residence and down on the left, Torggata has recently been elevated and graveled, but not yet asphalted. On the other side of the street, the Germans have left a long two-storey barrack ... On both sides of Torggata down on the left, endless open yards with grass and weeds, thistles and nettles. The yards end in a fertile belt of tall, wavering rushes with a forest of brown cigars on the top, in front of the enclosed Gunneklevfjord, glittering in the sun in all hues of pollution. On the left side of the fjord Hydro's factory buildings tower proudly, in particular the tallest round tower which day and night pumps out the thick, yellow smoke which always gives the wind strength and direction." (Berntsen, pp.72) The barrack being described would soon be demolished to provide room for a community house.

Up Torggata, to the right and into the forest, one would arrive at the beach of the Frierfjord where boats lay waiting outside Hydro, "and where we could make out the contours of Herre and the cellulose plant from which the fart-like Herre smell would come." (Berntsen, p. 77)

The workers lived, among other places, on the eastside of Kirkehaugen in "owned homes". The engineers lived in the "'engineer town' consisting ov villas with spacious gardens having been situated facing the still idyllic Frierfjord, closest to the factories, when Hydro's plant on Herøya grew from 1928 on. Or they would occupy the row of Hydro's more elegant one-family houses for engineers at Bakkedammen and, in a few cases, the grand workers' villas in Adriansåsen, the hill atop Herøya. Or increasingly in Hefalia, which lay on the opposite side of the factories, between Herøya and Porsgrunn."




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