2 percent after the multi-utility posted a rise in first-half revenues and said it was on track to meet regulatory outperformance targets.
Volume was thin, at just 22 percent of the average 90-day volume, and the profit taking saw the FTSE remain in a range of between 5,600 and 5,900 that has persisted since August.
A resolution to the fiscal cliff, which will come into effect in January if no deal is done, is seen as key to boosting both equity prices and volumes.
We're seeing short positions coming on board with a view to closing at 5,600, TJ Markets head of trading Manoj Ladwa said.
(If a deal on the fiscal cliff is reached) you'll start seeing volumes returning back to the market and the index creeping up towards the high end of the range around 5,900.