SARATOGA, Wyo. (AP) — The state has extended a permit for a planned coal-to-liquids plant near Medicine Bow.

Houston-based DKRW Advanced Fuels got a state industrial siting permit for the $2 billion plant almost six years ago. Difficulty lining up financing and contractors has delayed the construction start.

State industrial siting officials have been expecting an updated construction schedule and recently told DKRW it was out of compliance with the permit terms.

On Wednesday, the state Industrial Siting Council approved a permit change sought by DKRW. The change allows DKRW to delay construction for up to 39 more months, but the permit would become invalid if DKRW doesn't submit a construction schedule within 30 months.

The plant would process coal into gasoline. Company officials say the process remains economical despite booming U.S. oil production.