Justices heard oral arguments in the high-stakes case but did not say when they would rule.
Voters will have to decide the virtues and vices of establishing a 2,500-foot buffer between well and buildings in November.
The November ballot measure, which would compensate private landowners if government drilling limits diminished their property values, is largely funded by the oil and gas industry.
Will the distance between oil and gas development and homes, rivers and schools increase by a factor of five? That's up to voters.
Westmoreland Coal Co. has more than $1.4 billion in debt amid declining demand for the fuel.
A replacement rule from the Interior Department rescinds mandates for companies to reduce gas pollution.
Amendment 74 would to allow Coloradans to make financial claims if their property is devalued because of government action.
This will be the first time that voters across the state get a chance to weigh in on a potential oil and gas regulation.
At its heart, Amendment 74 would adjust how “takings claims” work under Colorado law.
The company said customers will save about $213 million by 2054 as renewable energy continues to get cheaper.