Colorado ? Boulder has approved regulations for the medical marijuana industry with a twist in keeping with the sensibility of this liberal-leaning, Colorado university town.

The regulations unanimously passed Tuesday will require growing operations to offset 100 percent of their electricity use with wind or solar power.

Other rules limit dispensaries to 3,000 square feet and require them to be at least 500 feet away from schools and licensed day-care centers.

The city’s estimated 100 dispensaries have until Oct. 31 to apply for an operating license. Applications will cost up to $5,000.