By Natalia Drozdiak and Jenny Busche 

FRANKFURT--German power company E.ON SE said Wednesday the bankruptcy protection filing by its Brazilian joint venture Eneva SA would hurt its bottom line this year, but wouldn't have a major impact on its earnings outlook.

Eneva, a power utility jointly owned by E.ON and Brazilian entrepreneur Eike Batista, filed for bankruptcy protection in a court in Rio de Janeiro after it failed to refinance its 2.33 billion Brazilian reais ($898 million) in outstanding debt, the company said.

An E.ON spokesman said write-downs of its Brazilian operations would affect this year's net profit, but E.ON couldn't yet judge the scale of the damage. It said, however, it wouldn't have much of an impact on its 2014 earnings before interest, taxes, depreciation and amortization, or its underlying net profit figure.

Last week, E.ON said it would establish a new company around its conventional power-generation operations, global energy trading, and exploration and production units, which include its struggling operations in Brazil.

E.ON has had problems with its operations in Brazil since the collapse last year of the business empire of its partner, former billionaire Mr. Batista. He sold a stake in the energy company, formerly known as MPX Energia SA, to E.ON in 2012. E.ON now has a 43% stake in Eneva and Mr. Batista has 20%. E.ON has had to invest about EUR1.3 billion ($1.6 billion) in Eneva since entering the Brazilian market, far more than originally planned.

The Eneva news didn't spook E.ON investors, with shares up 1.0% around 1137 GMT.

"There are still pros [to operating in Brazil] given its very regulated producer market," said Equinet analyst Michael Schäfer. "One's better off there than in southern Europe, where there's excess capacity."

Before E.ON said it was splitting into two companies, it was shifting more operations to markets such as Russia, Turkey and Brazil, in a bet electricity demand will grow faster there than in Europe.

"At least this shows that Eneva is a genuine non-recourse subsidiary, although it is still negative for sentiment and not a good reflection on E.ON's past strategy," said BNP Paribas analyst James Sparrow.

Eneva said the seven thermoelectric power plants operated by the company weren't included in the filing, which relates to the holding company, Eneva SA, and its subsidiary Eneva Participações SA The joint venture operates around 2.4 gigawatts of generating capacity, serving about 7 million households.

Luciana Magalhaes

in São Paulo contributed to this article.

Write to Natalia Drozdiak at natalia.drozdiak@wsj.com and Jenny Busche at jenny.busche@wsj.com

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