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British Gas was being particularly badly affected, following Origin Energy's rejection of the UK gas producer's $13 billion (£6.5 billion) bid earlier this week.
BP and Royal Dutch shell also gave up ground in the index, losing 1.6 per cent apiece.
Currently, City AM says that the best-performing stocks and shares in the FTSE 100 are British Airways - which gained 6.98 per cent - and Carnival, followed by Easyjet and Ryanair.
Meanwhile, in the financial sector, Alliance & Leicester showed a gain of 5.4 per cent, while Friends Provident, Standard Life, Lloyds TSB and Barclays were also boosted by three per cent or more.
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