"Investor meetings will be held in London, Frankfurt and Vienna staring on Monday," one source, familiar with the process said.
"A euro-denominated benchmark offering with 7 to 10-year tenors will follow, subject to market conditions," the source said.
BEH has hired Citigroup and First Financial Brokerage House to manage the bond issue, needed to refinance a five-year, 500 million euro Eurobond that matures in November.
The company will also make a tender offer for the maturing bond to help optimise its interest costs.
BEH, owner of Bulgaria's biggest state energy firms for natural gas supply and transmission, power generation as well as coal mining, plans a dual listing of the new bonds on the Irish and Bulgarian stock exchanges.