Bulgaria's competition regulator said that it has opened proceedings in relation to a complaint filed by local consortium GBS Sever over the ranking of offers submitted in a tender of state-owned Bulgartransgaz for construction of a main gas pipeline. The complaint was submited by the consortium comprising Glavbolgarstroy and Glavbolgarstroy International on October 8, the Commission for Protection of Competition said on Wednesday. On September 27, Bulgartransgaz said it has decided to sign a contract for the supply, construction and commissioning of a main gas pipeline linking valve station (VS) Batultsi and VS Kalugerovo with Zapadgasenergoinvest consortium led by local Europroject Building.GBS Sever's offer was ranked second, as it received lower marks both in terms of price and technical criteria. GBS Sever's bid was priced at 22 million levs ($12.9 million/11.2 million euro), while Zapadgasenergoinvest tie-up offered to build the pipeline for 21.9 million levs. Europroject Building has a registered capital of 2 levs and is fully owned by private individual Yoana Litovska, commercial register data shows.