Bulgaria's AES-3C Maritza East 1 said that it has opened a 1.8 million levs ($1.0 million/920,300 euro) tender for carrying out insulation works on the territory of coal-fired power plant AES Galabovo, operated by the company.The tender envisages the insulation of power installations and equipment at the plant along with the supply of the necessary consumables and materials, AES-3C Maritza East 1 said in a tender notice on Tuesday.Candidates in the public procurement procedure are required to prove that their turnover in the respective field for the last three financial years represents at least 50% of the estimated price of the tender and that they have worked under similar contracts in the last five years.The deadline for submitting offers is March 4.