Our assets

Producing since 2004 Alpha has established a robust, balanced portfolio with its producing, development and appraisal assets.


Helvellyn was discovered in 1985 and was acquired by Alpha in 2001 from BP.

The field has been developed by a single subsea well tied back to the Perenco operated Amethyst A2D platform from where gas is exported to Dimlington.

Gas Production began in February 2004, and 19bcf of gas had been produced up to end 2017. There are estimated remaining reserves of c.1bcf. No further development activity is currently contemplated at Helvellyn.

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Helvellyn asset summary

Licence P001, Block 47/10a

Alpha (Field Operator), 100% equity

Status Shut-In


The Tors development consists of 2 gas fields, Kilmar in Block 43/22a and Garrow in Blocks 42/25a and 43/21a.

Kilmar was discovered in 1992 and has gas in Carboniferous Namurian sandstones. Alpha acquired 100% equity from BP (2001) and GDF (2004), subsequently selling interests to Sojitz (2005) and Edison (2008).

Garrow was discovered in 1991 and has a Rotliegend reservoir. Garrow was an out of round award to Alpha in 2002 and equity was subsequently sold to Sojitz (2005) and Edison (2008).

First gas production was achieved in 2006. The gas is exported via Trent and the ETS pipeline to Bacton, Norfolk.

The Kilmar Normally Unmanned Installation (NUI) was installed in 2005, a 6 slot platform. 3 wells have been drilled and, up to end of 2017, 69 bcf of gas had been produced. There is an estimated c. 46 bcf of recoverable gas remaining.

Kilmar is a large structure and the 3 current producing wells do not access all of the calculated gas in place. Detailed reservoir engineering work has identified infill locations and we are evaluating further development options

The Garrow NUI platform was installed in July 2008.This is a 3 slot platform, two production wells have been drilled and, up to end of 2017, 7.6 bcf of gas had been produced. Remaining recoverable gas is estimated at 4 bcf.

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Tors asset summary

Licence P683, Block 43/22a and Licence P1034, Blocks 42/25a and 43/21

Alpha (Field Operator) 17%, Energean 68%, Rockrose 15%

Status: Producing


The Wenlock gas field was discovered in 1974. Equity in the licence was acquired from BP in 2001 and from ConocoPhillips in 2005.

The Wenlock NUI platform was installed in September 2006 with 3 production wells drilled resulting in the first gas production in December 2007. Gas is exported via a 37km pipeline to the Perenco operated Indefatigable.

Wenlock field production was 44.5Bcf at the end of 2020 and is expected to cease production Q2 2022.

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Wenlock asset summary

Licence P033, Block 49/12a North.

Alpha (Field Operator) 20%, Energean 80%

Status: Producing


Cheviot is a redevelopment of the Emerald field which was discovered in 1975 and initially developed in the mid-1990’s. However, as a result of inadequate project planning and execution, the Emerald field was abandoned early when only 8% of the original oil in place had been produced.

In 2003, Alpha was awarded the licence in the 21st Licence Round.

Alpha has used the extensive available database to define an optimised, low cost Field Development Plan that gained technical acceptance from the OGA in December 2015. That plan is based on the development of oil from the Cheviot and satellite Peel fields. There will be a subsequent simple development of the Cheviot gas caps and Padon satellite field. Alpha is developing oil reserves of at least 55 mmbbls and future gas volumes of 120 bcf.  Alpha will also look to use the Cheviot facility as a hub for other nearby discoveries and prospects, which have an unrisked potential of some 400 mmboe.

Alpha has signed an Exclusivity Agreement with Teekay to redeploy the Varg FPSO to Cheviot for the development of the oil. 

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Cheviot asset summary

Block: 2/10b, 2/15a, 3/6a & 3/11b

Alpha (Field Operator), 100% equity

Status: Development