(Adds details of the deal from second paragraph.)

By Alex MacDonald

LONDON--U.K. utility SSE PLC (SSEZY) said Wednesday it has agreed with French oil and gas major Total SA (TOT) to buy a 20% stake in four gas fields in the North Sea's Shetland Islands and a 20% stake in a new Shetland gas plant for 565 million pounds ($881 million) in cash.

The deal is aimed at staving off an expected decline in SSE's annual gas production profile while, for Total, the deal is in keeping with its aim to divest $5 billion of assets in 2015 and reduce the amount of money it plows into projects as it pushes to conserve cash in a low oil and gas price environment.

As part of the deal, SSE has agreed to invest GBP350 million by 2018 to complete the fields' development.

The transaction, which is forecast to close by March 2016, is taking place at a time of relatively low wholesale gas prices and is therefore timely, said Alistair Phillips-Davies, SSE's chief executive. "It completes our portfolio of gas production assets for the foreseeable future."

The fields are located in the Greater Laggan Area where gas production is due to start later this financial year. The fields are forecast to hit a peak production rate of five million therms of gas a day in 2016, of which SSE will be entitled to one million therms a day.

Production from the acquired fields is expected to be sustained at that level until around 2020, before declining over the following 10 years in the absence of further development.

The agreement comes at a time when SSE's existing production volumes are expected to decline. The acquisition will help sustain the company's annual attributable gas output above last year's level for several years to come, SSE said.

SSE plans to finance the deal by issuing a bond and by using proceeds from SSE's ongoing asset disposal program.

Citigroup analysts said in a note that the stake sale shows there is still life in offshore oil and gas mergers and acquisitions. The deal marks the first offshore asset sale in 2015 and represents a 20% premium to book value, according to Citigroup.

"It looks like the industry is still prepared to use oil prices above current spot/forwards when it looks to M&A," the bank said, noting that it used a benchmark oil price of $75 a barrel to value the assets. "The sale also illustrates that key industry participants are less bearish on European gas prices than many in the equity market have become ahead of the imminent arrival of US LNG into the supply dynamic," it added.

SSE's shares were up 0.3% at 1,512 pence share while Total's shares were up 0.8% at 43.57 euros ($48.20) a share.

Total Wednesday reported a 4% decline in second quarter net profit compared with the previous year, as aggressive cost-cutting and an increase in oil output has helped to offset the fallout from the global oil price collapse on its bottom line.

--Inti Landauro in Paris contributed to this story

Write to Alex MacDonald at alex.macdonald@wsj.com

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