* Bosnia utility to sell 80 MW to Serbia

* Worst flooding in 120 years

* Serbian prices trade as much as 2 euros higher

PRAGUE, May 16 (Reuters) - Central European prompt power fell on Friday headed into the weekend but floods in the Balkans helped lift day ahead in Serbia and support prices in Hungary for Monday, traders said.

Czech and Slovak electricity for Saturday fell 9 percent to 29.76 euros ($40.82)per megawatt-hour and Hungarian day-ahead declined 6 percent to 31.85.

In the over-the-counter market Hungarian power for the next work day rose to 41 euros while Serbian day ahead prices rose as high as 2 euros to 36 euros due to the floods, traders said.

Serbian utility EPS has said it would have to import 3.3 gigawatt-hours (GWh) of electricity after flooding had cut its power generating capacity by 10 percent. On Friday, Bosnia's power utility Elektroprivreda RS (EPRS) ERST.BJ said it would sell 80 megawatts of electricity to EPS. ID:nL6N0O2203

The flooding - expected to hit other parts of the Balkans over the weekend - has halted 480 MW in coal-fired capacity and reduced output of its run of the river hydro power plants.

"Serbia is buying energy," one trader said. "Prices from yesterday traded as high as 2 euros above yesterday's price"

Trading was light further along the curve with the Czech Cal '15 falling 5 cents to 33.45 euros in over-the-counter trade. The benchmark German Cal '15 contract dipped 7 cents to 34.25 euros on Germany's EEX in afternoon trade.

Around the region, Russian natural gas exports to European consumer nations via Ukraine remained stable on Friday, a spokesman for state-controlled gas producer Gazprom GAZP.MM said. ID:nL6N0O22QQ

Day ahead on Poland's POLPX exchange fell to 148.63 zlotys ($48.62)from 163.53 zlotys.

Brent crude oil rose above $109 a barrel as tension over Ukraine kept investors on edge, although a gradual return of Libyan oil supply capped gains. O/R

European Union carbon futures CFI2Zc1 rose 3 cents to 4.86 euros a tonne in afternoon trading. ($1 = 0.7291 Euros) ($1 = 3.0567 Polish Zlotys)

(Reporting by Michael Kahn; Editing by William Hardy)

((michael.kahn@thomsonreuters.com)(+420 224 190 443)(Reuters Messaging: michael.kahn.thomsonreuters.com@reuters.net))

Keywords: MARKETS CEE/ELECTRICITY