UPDATE 1-RWE asks for bids by end-December in DEA sale -sources
* Asset seen valued at 4-5 bln euros - sources
* KKR, Blackstone, Centrica likely to be interested-sources
* Qatar Petroleum interest cooled by political issues-srces
* BASF's Wintershall has already said it may bid
By Arno Schuetze and Christoph Steitz
FRANKFURT, Oct 18 (Reuters) - German utility RWE is asking potential buyers of its oil and gas unit DEA to submit offers by late December, in a deal that could fetch up to 5 billion euros ($6.8 billion), three people familiar with the matter told Reuters.
RWE, suffering from loss-making power plants, a boom in renewable power and 35 billion euros in net debt, said in March it planned to sell DEA to save billions of euros of investment in the exploration and production business.
"Bids are due around Christmas," one source said. RWE has previously said it expects to complete the sale next year.
With operations in 14 countries including Germany, Britain, Norway and Egypt, DEA employs nearly 1,400 and accounted for about 11 percent of RWE's operating profit in 2012.
It has stakes in about 190 oil and gas licenses or concessions in Europe, the Middle East and north Africa, some of which are non-producing and in need of large investments.
Wintershall, the oil and gas arm of German chemicals company BASF, has already expressed interest in DEA.
Private equity firms such as KKR and Blackstone are also likely to bid, two sources said. One said they could buy the asset, then slice it up and sell it in pieces.
Utility sector bankers also said they expect British energy supplier Centrica to show interest in DEA.
RWE, KKR, Blackstone and Centrica declined to comment.
RWE's advisor Goldman Sachs has also been touting the asset around Asia in the hope of attracting interest from the likes of China's Sinopec , one of the sources said.
A senior Sinopec official told Reuters the group was unlikely to be interested in more European oil assets after recently buying assets in the North Sea and Egypt.
Meanwhile, the interest of Qatar Petroleum International (QPI) in DEA is likely to have cooled because of the latter's presence in Egypt, where Qatar had backed overthrown President Mohamed Mursi.
QPI was not immediately available for comment.
Egyptian assets make up about 10 percent of DEA's likely value of between 4 and 5 billion euros including debt in any transaction, while the northern European assets account for three fourths, the sources said.
Based on a low-end 4 billion euros valuation, DEA would be priced at an EV/EBITDA multiple of 3.8 times, a discount to the 4.1 times average for European oil and gas exploration and production (E&P) companies, according to StarMine.
Illustrating RWE's need for a disposal, the company has had negative free cash flow through the past four years, according to Thomson Reuters data. In 2012 the figure was a negative 686 million euros.