UPDATE 1-German renewable surcharge to rise by 47 pct -source

* Charge to rise to 5.3 cents from 3.6 cents -source

* Network operators all decline to comment

* Increase scheduled to be released on Oct. 15

* Politically sensitive move before next year's election

(Adds details, background)

BERLIN, Oct 10 (Reuters) - Germany's surcharge for renewableenergy will rise by 47 percent next year, a government sourcetold Reuters on Wednesday, putting pressure on consumers, whowill bear the brunt of costs of the country's energy shift awayfrom nuclear power.

The strong increase reflects the fact that increasingamounts of electricity are generated from renewable sources andthat this power is bought from producers at guaranteed pricesabove market rates.

The so-called 'Umlage' -- charges levied on German consumersto support renewable power -- will rise to 5.3 euro cents perkilowatt hour (kWh) in 2013 from 3.6 cents in 2012, the sourcesaid.

The four leading high voltage network operators (TSOs) arescheduled to officially release the increase on Oct. 15.

They include 50Hertz, owned by Belgian Elia andAustralian fund IFM, E.ON's former high voltage gridunit TenneT , RWE's former unit Amprion, andEnBW's grid unit TransnetBW.

All four operators declined to comment on the news.

Under German law, green power from sources like wind andsolar must be fed into the electricity grid and paidabove-market rates in a system partly administered by the TSOs.

The renewable surcharge covers the difference betweenguaranteed prices paid for renewable energy and market pricesfor conventional energy.

One year before a federal election in which ChancellorAngela Merkel will seek a third term, the sharp rise in the feeis politically-charged.

German media have made much of the cost to households fromMerkel's abrupt decision last year to speed up the switch torenewables and switch off nuclear plants earlier than planned.

Opposition parties have accused the government of lettingprivate consumers bear the brunt of the cost of the shift, notleast because it has granted major exemptions toenergy-intensive heavy industry.

(Reporting by Berlin bureau, Tom Kaeckenhoff in Duesseldorf andChristoph Steitz in Frankfurt; writing by Christoph Steitz;editing by Keiron Henderson)

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