Production start-up on Harbour Energy’s Tolmount field in the Southern Gas Basin offshore the UK has been delayed due to issues identified on offshore electrical systems during final commissioning and testing of the HGS Tolmount platform.

Harbour confirmed the issues are under investigation and rectification plans are being developed.

“As a result, Tolmount first gas will be delayed beyond the end of July and is now likely to be around year-end,” the company said on Wednesday.

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The platform’s topsides and jacket were fabricated by Rosetti Marino at its yard in Ravenna, Italy, and installed last year by Heerema Marine Contractors' semi-submersible crane vessel Sleipnir.

With expected plateau rates of between 20,000 and 25,000 barrels of oil equivalent net to Harbour, Tolmount was expected to contribute just over 10,000 boepd to the independent's net 2021 production.

Revised guidance

Due to the uncertainty around the timing of Tolmount start-up, Harbour has revised its production guidance for the year to exclude volumes from the project.

As a result, Harbour's 2021 forecast is now 185,000 to 195,000 boepd on a pro forma basis and 170,000 to 180,000 boepd on a reported basis.

This revised guidance also reflects actual pro forma production to the end of June of 180,000 boepd coupled with the delayed restart of Elgin Franklin following the summer maintenance shutdown.

Harbour’s forecast full-year operating costs of between $15 and $16 per boe and total capital expenditure of US$1.1bn remain unchanged.

UK-listed Harbour became the operator of Tolmount after it was created via the reverse takeover of former operator Premier Oil by private equity-backed Chrysaor.

Premier acquired its 50% operated interest in the offshore field, located in Block 42/28d, in 2016 as part of its acquisition of E.On E&P UK.

Dana Petroleum, Harbour’s partner on Block 42/28d, has funded the Tolmount Main platform and pipeline — together called the Humber Gathering System — together with a subsidiary of midstream infrastructure operator Kellas Midstream.