December 29 (SeeNews) - Bulgaria's state-owned coal thermal power plant (TPP) Maritsa East 2 said that it has awarded two contracts for the supply of limestone worth 23.8 million levs ($13.7 million/12.1 million euro) in total, to Inertni Materiali-Yambol and a group comprising local companies Pir-Impeks, Persenk Invest, and a tie-up between these two companies.