ANRE said earlier it planned to keep electricity distribution and transport prices unchanged until end-June.
The regulator has also raised the tariff applied by the country's power market operator, OPCOM, by 23.33% to 0.37 lei per MWh, Transelectrica said in a statement filed to the Bucharest Stock Exchange.
"We see the news as positive [for Transelectrica] and we will revise upwards our 2013 estimates. We see the current stock price as a good entry price to gain exposure on the stock," Raiffeisen Capital & Investment Research said in its daily report.
Blue chip Transelectrica was trading 9.13% up at 12.55 lei by 1332 GMT on the Bucharest bourse on Friday.
(1 euro = 4.4381 Romanian lei)