Theres an added reason why CCS may be a good business bet. Theres a suggestion that pumping CO2 into a former oil field could help force out some of the remaining reserves which are ordinarily hard to get at, a process known as enhanced oil recovery. That makes CCS more cost-effective, because one of the by-products has a high value and should mean a plant needs less financial support. It also makes it a particularly appealing prospect for a company such as Shell that has been extracting oil and gas from the North Sea for decades and has already used up many of the easiest fields.

　　But its far too early for any talk of a bonanza for SSE and Shell, or for Britain. The two companies are clearly waiting for ministers to throw them some money before they do anything at all. The government gave around 30m towards the Longannet project plan. They also hope to receive money from Europe for the pilot. Even if the money comes through, the firms wont be in a position to begin a full engineering design until the second half of next year. So this weeks news is good but Britains first carbon capture and storage plant remains a very long way off.

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