Owning a still in Colorado is legal with no specific laws saying otherwise. It is illegal to use a still to make spirits for consumption or resale without a license.
Colorado ABC website
No state license is available or required to produce ethanol fuel for your own personal use. Federal license is still required.
Colorado now offers a Distillery pub license. There are several additional forms that must be completed before hand, and additional licenses for distilleries.
Supplier Application (DR 8409)
Individual History (DR 8404-I)
Lawful Presence Affidavit (DR 4679)
There are several licenses you need to request to legally manufacture spirits. Below are the federal licenses only. Additional state requirements will need to be followed as well.
You must submit a request for a license to manufacture spirits: TTB 5110.41 Basic permit.
This license only allows you to produce spirits. You also need a license for the distilling equipment / distillery: TTB 5100.24 Distilled spirit plant
For manufacturing ethanol fuel you will need to submit a request for a TTB 5110.74 for a federal license.
Owning a still and operating one is legal in Colorado as long as it is not used to produce ethanol. The selling of non-taxed moonshine is illegal.
Current federal laws allow citizens the right to own a still and operate it for non-alcohol production.
This means legally you can: