Who operates the Troll field?

Troll is operated by Equinor Energy AS, in partnership with Petoro AS, A/S Norske Shell, TotalEnergies EP Norge AS and others.

How much does Troll produce?

742,586 barrels of oil equivalent per day as of May 2026 — 17.5% of Norwegian Continental Shelf output, ranking 1 of 94 producing fields.

When did Troll start producing?

First production was reported in 1990, 11 years after discovery well 31/2-1 proved the field in 1979.

What is the Norwegian Continental Shelf?

The Norwegian Continental Shelf (NCS) is the seabed area where Norway holds sovereign rights over petroleum resources, covering the North Sea, the Norwegian Sea and the Barents Sea. It holds roughly 90 producing fields, and its output is the largest single source of Norway's export income.

What does NCS Live show?

Every in-service surface installation and subsea structure on the shelf, the offshore pipeline network, field outlines and seabed relief, with live vessel traffic and offshore helicopter flights on top of them. Optional layers add seismic survey activity, cold-water coral, wind and wave forecasts, and a counter for the value each field is producing today.

Where does the data come from?

Infrastructure, fields and production come from the Norwegian Offshore Directorate (Sokkeldirektoratet) FactPages under the NLOD licence. Vessel positions are AIS from BarentsWatch and Kystverket. Helicopter movements are derived from Avinor flight data. Coral observations come from the Institute of Marine Research and MAREANO, and export prices from Statistics Norway (SSB).

Is the vessel traffic real time?

Yes. Tankers and offshore support vessels are drawn from live AIS positions and refreshed continuously, with speed, course and self-reported destination. Helicopter positions are dead-reckoned estimates between known departures and arrivals, not surveillance.

Are the pipeline flows measured?

No. Pipeline thickness and the travelling flow animation are estimates, derived by accumulating monthly field production through the pipeline network. They are not metered throughput, and thickness is not pipe diameter.

Can I see how the shelf was built out?

Yes. The time machine replays the shelf from 1971, the year Ekofisk started producing, to today. Installations and pipelines appear in the year they entered service, with total production and the number of producing fields for each year.

Is NCS Live free to use?

Yes, free and with no account. It is a public visualisation of open data, built and designed by Smpl and Melvær&Co in Norway.

Troll field

Troll is producing 742,586 barrels of oil equivalent a day — 17.5% of everything the Norwegian Continental Shelf produced in May 2026, ranking 1 of the 94 fields in production.

Production

742,586 boe/d

Share of NCS

17.5%

Operator

Equinor Energy AS

First oil

1990

What it produces

In May 2026 the field delivered 742,586 barrels of oil equivalent a day, classified by the directorate as oil/gas — almost entirely gas. Output has moved down 7.6% over the past twelve months, and the directorate's profile for the field is mature. The field's best year was 2003, averaging 835,831 boe/d — today it runs at 89% of that.

Since 1990, Troll has produced roughly 7,782 million barrels of oil equivalent in total. The directorate's estimate of recoverable resources is 11,422 million boe, of which about 68% has now been recovered; 3,625 million boe remained as of 31.12.2025.

The story of Troll

Troll holds a large share of all the gas ever found on the Norwegian shelf, and has led the shelf’s production for most years since the late nineties. The gas was proven in 1979; the thin oil layers beneath it — long thought unproducible — were unlocked by horizontal drilling, and Troll B and C turned them into one of Norway’s biggest oil developments in their own right.

Troll A itself, installed in 1995, is a concrete gravity structure over 470 metres tall — the tallest structure ever moved across the surface of the earth. Its gas lands at Kollsnes, and the platform has run on power from shore since startup.

Timeline

1979
Gas proven by well 31/2-1
1990
First production reported
1995
Troll A installed — the tallest structure ever moved
1996
Troll gas starts flowing to Kollsnes
1999
Troll C (semisub steel) enters service
2003
Best year to date — 835,831 boe/d
2021
Power from shore, fed from Kollsnes

Production by year, 1990–2026

OilGasNGL/condensateboe/d

Full table, year by year

Year	Oil	Gas	NGL	Condensate	Total boe/d
1990	18,117	0	0	0	18,117
1991	3,034	0	0	0	3,034
1992	1,086	0	0	0	1,086
1993	1,036	0	0	0	1,036
1994	1,044	0	0	0	1,044
1995	49,220	0	0	0	49,220
1996	228,977	94,648	0	0	323,624
1997	254,479	246,726	0	0	501,204
1998	228,403	343,870	0	0	572,273
1999	222,455	438,773	0	3,749	664,977
2000	315,557	423,903	0	12,895	752,354
2001	336,091	369,356	0	11,020	716,467
2002	365,238	440,841	0	13,230	819,309
2003	358,802	450,968	0	26,061	835,831
2004	305,285	453,046	4,840	7,729	770,900
2005	242,857	488,372	22,571	0	753,800
2006	186,459	529,059	24,130	0	739,647
2007	162,429	616,585	23,598	0	802,611
2008	140,379	511,081	18,471	0	669,930
2009	135,265	420,501	18,361	0	574,128
2010	118,381	492,099	18,479	0	628,960
2011	125,181	427,301	16,019	0	568,500
2012	122,027	591,313	24,249	0	737,587
2013	122,296	510,674	21,282	0	654,252
2014	125,758	500,535	21,194	0	647,488
2015	120,875	596,827	23,049	0	740,751
2016	126,286	547,728	22,032	0	696,046
2017	124,834	633,205	25,295	0	783,334
2018	110,469	664,521	25,536	0	800,526
2019	107,857	543,988	20,629	0	672,474
2020	85,800	602,876	22,753	0	711,430
2021	70,106	643,834	23,676	0	737,616
2022	62,514	685,596	22,149	0	770,260
2023	40,258	645,614	22,784	0	708,657
2024	32,492	751,954	24,332	0	808,779
2025	25,191	706,500	18,814	0	750,505
2026	20,341	726,635	18,005	0	764,981

Average daily rates per calendar year, from Sokkeldirektoratet's monthly production figures. The final year is the average through May 2026.

Discovery and drilling

The field was proven by exploration well 31/2-1 in 1979. The directorate's wellbore register lists 830 wellbores on Troll: 50 exploration and 775 development, plus 5 others. The deepest reaches 10,200 metres measured depth. Water depth at the field's installations is 302 to 355 metres.

How it reaches market

Troll's production leaves the field by pipeline:

Troll Gassrør P10gas → Kollsnes
Troll Gassrør P11gas → Kollsnes
Troll Oljerør Ioil → Mongstad
Troll Oljerør IIoil → Mongstad
Troll Gassrør P12gas → Kollsnes

The field has run on power from shore — fed from Kollsnes since 2021 — rather than on gas turbines offshore.

Installations on Troll

Troll ACondeep 4 Shafts1996
Troll BSemisub Concrete1995
Troll CSemisub Steel1999

The first of them entered service in 1995. The field also has 75 subsea structures — wellheads and templates on the seabed — which are drawn individually on the map.

Licence partners

Petoro AS55.93%
Equinor Energy AS30.55%
A/S Norske Shell8.19%
TotalEnergies EP Norge AS3.69%
ConocoPhillips Skandinavia AS1.64%

The field sits in blocks 31/2, 31/3, 31/5, 31/6, under production licences PL 054, PL 085, PL 085 C.

Questions people ask

Who operates the Troll field?: Troll is operated by Equinor Energy AS, in partnership with Petoro AS, A/S Norske Shell, TotalEnergies EP Norge AS and others.
How much does Troll produce?: 742,586 barrels of oil equivalent per day as of May 2026 — 17.5% of Norwegian Continental Shelf output, ranking 1 of 94 producing fields.
When did Troll start producing?: First production was reported in 1990, 11 years after discovery well 31/2-1 proved the field in 1979.

See it live

Troll is drawn on the NCS Live map with its outline, its pipelines and the vessels working it in real time — and på norsk. The directorate's own record is on the SODIR FactPages.

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