Gassco

Gassco is a Norwegian state-owned company established in 2001 to operate the Gassled gas pipeline system, the world's longest offshore pipeline network, on behalf of its owners, which include Equinor, Shell and other North Sea licence holders. Gassco acts as a neutral, non-commercial transmission system operator (TSO): it holds no gas itself but manages transport and processing capacity on behalf of shippers. In May 2026, Gassco filed the regulatory outage notice for Kollsnes following a compressor failure on the Troll A platform discovered on 21 May, which cut Troll send-out by 34.6 mcm/day from 26–30 May. By 11 July, Gassco's Norwegian exit nominations, the daily volumes shippers commit to withdraw across the Gassled system, had recovered to 319.8 MCM/day as Equinor's ASGARD field returned from maintenance, the system absorbing a summer storage-driven price rally without physical strain.

Gassco operates the Kollsnes gas processing plant near Bergen, where Troll field gas arrives via the Troll pipeline before being processed and distributed across the continental European grid. It also operates other major reception terminals including Kårstø, Nyhamna and Tjeldbergodden. The TSO model means Gassco is responsible for planned and unplanned outage notices (REMIT filings), capacity nomination, and maintenance scheduling across the Gassled infrastructure. Exit nominations are published daily and function as the market's most current read on Norwegian export intent, ahead of settled flow data itself, making them a primary reference point for European gas traders tracking Norwegian supply.

Norwegian gas exported through the Gassled system supplies approximately 25% of EU gas demand, making Gassco's operational decisions highly consequential for European energy security. With Russian pipeline gas largely absent from the European market since 2022, Norway has become the EU's principal swing pipeline supplier, so short-term nomination swings, like the July ASGARD-driven recovery, carry disproportionate weight in setting near-term price direction. The May 2026 Troll outage combined with Hammerfest LNG offline had earlier placed more than 50 MCM/day of Norwegian supply out simultaneously, demonstrating the concentration risk that flows from Gassco's infrastructure serving as the single export route for multiple major Norwegian fields.