State attorneys will file a notice of intent to sue over the bird's threatened status, the governor's office confirmed.
An advocacy group says a state rule is hurting efforts to make some commercial buildings in Colorado more energy efficient.
The decision may impact oil and natural gas development in the habitats of the birds.
Fifty-seven private and public buildings will be part of the Denver City Energy Project.
Colorado's diverse economy shields Denver from oil bust like the one that hit downtown in the late 1970's and early 1980's.
As oil is increasingly exported from the state via rail some wonder if there's a safer solution.
Colorado State University is now offering real-time updates on groundwater quality for oil and natural gas sites in the Denver-Julesburg Basin.
The 21-member group will provide recommendations to the Legislature next year that would reduce land-use conflicts.
Real estate prices in Northern Colorado are rising because of the increased oil and gas activity in the area, but may go down the closer the rigs are to homes.