Bulgaria has given investors in a trans-Balkan oil pipeline aimed at transporting Russian crude through Bulgaria to Greece more time to improve their environment plans, the environment ministry said on Monday.

The company which manages the 300-km Burgas-Alexandroupolis oil pipeline project has been given one more month by the end of September to resubmit their environment assessment impact study.

Bulgaria plans to put limits on new renewable energy assets to avoid a spike in sensitive energy prices and a collapse of its aging power grid, Economy and Energy Minister Traicho Traikov said on Friday.

Traikov said the Balkan country can add up to 2,000 megawatts of new solar, wind and hydro power plants by 2020 without jeopardizing the security of power supply and keeping the energy prices a