Bulgaria's Electricity System Operator (ESO) said on Friday that it has opened a 2.5 million levs ($1.5 million/1.3 million euro) tender for the repair of a 23-kilometer 110 kV power line.Repair works must be carried out within 135 days, ESO said in a tender notice.The deadline for submitting offers is October 16.Bids will be ranked solely based on price.(1 euro = 1.95583 levs)