* Adjusts outlook, to book 3 bln euro impairment charge
* Move raises questions about M&A strategy
* Shares down 1.0 percent
(Adds detail, background)
By Christoph Steitz
FRANKFURT, Dec 13 E.ON (EONGn.DE) was one of the biggest fallers on Germany's blue-chip stock index on Tuesday morning after a 3 billion euro ($4 billion) impairment charge raised more questions about how the utility will adjust to limited growth in its home market.
Germany's decision to abandon nuclear power threw E.ON into crisis earlier this year, forcing it to cut its dividend, 11,000 jobs, and its outlook. [nLDE7780PG]
E.ON, whose shares were down 1.0 percent at 1020 GMT, cut the upper end of its 2011 operating profit target range due to the outlook for long-term power prices in Italy and Spain after the market closed on Monday. [nL6E7NC46I]
While most brokerages -- including JP Morgan and Morgan Stanley -- said the impairment's impact would be short term, WestLB's Peter Wirtz said the move fuelled concerns about E.ON's future strategy.
"The company's poor track record in terms of acquisitions puts the company's new ambitions to look for growth overseas ... back on the radar screen of investors," Wirtz said, downgrading the stock to "neutral" from "add".
Sources had told Reuters on Friday that E.ON had submitted a binding offer for Portugal's 21.35-percent stake in national power provider EDP (EDP.LS), a move that would allow it to tap new growth markets and expand its reach. [nL5E7N945A]
According to a report, the company put in the lowest offer of the four bidders still in the process. [nL6E7NC0UN]
As part of its restructuring, E.ON plans to divest 15 billion euros of assets by end-2013, of which more than 9 billion has been realised.
German newspaper Sueddeutsche Zeitung reported German insurer Allianz (ALVG.DE) was in talks to buy the gas transportation network of E.ON unit Ruhrgas, a deal that could be worth 2.0-2.5 billion euros. [nL6E7ND0FJ]
($1 = 0.7567 euro)
(Editing by Dan Lalor)
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