Eon posted earnings before interest, taxes, deductions and amortisation (Ebitda) of £241 million, a fall from £257 million during the same period in 2011.
Investment of £65 million was made in the UK arm, down from £133 million last year.
Across the group, Eon posted Ebitda of £7 billion (€8.8 billion) but sales declined at its nuclear and fossil generation business, attributed to the closure of nuclear power stations in Germany.
The company warned of weakening power demand in Europe and signalled it may have to close plants and step up efficiency efforts after cutting its outlook for next year.
“Our nine-month results reflect the first successes of the transformation of our company and our ongoing efficiency-enhancement programmes. But they also clearly indicate that we face huge challenges, particularly in our generation business,” said Eon’s CEO, Johannes Teyssen.
“That’s why we’re further optimizing our conventional generation portfolio and also exploring whether to close some assets. Where assets are important for ensuring the stability of the power supply, we’re working with system operators and government agencies to find interim solutions.”