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Colorado: Prove the available service before requesting a price
Start with EIA: natural gas customer choice and eligibility. The table below links this decision to the represented gas companies in Colorado. It does not establish service or supplier availability for every account.
Authorization is only one gate
A regulator’s supplier approval and a utility’s accepted supplier or agent are different checks. A licensed company may decline a particular volume, credit profile or service class. Obtain written acceptance for the listed accounts.
Return service needs its own answer
Ask what happens if a supply agreement ends or an agent stops performing. Confirm the utility’s return conditions and start date; a supplier cancellation does not itself establish an accepted replacement enrollment.
Colorado utility application
| Gas service company | Classification and accepted enrollment | Primary reference |
|---|---|---|
| Xcel Energy / Public Service Company of Colorado | Transportation agreement, capacity, nominations and imbalance responsibility | Official program / tariff |
| Black Hills Energy | Applicable operating company, capacity and service agreement | Official program / tariff |
| Colorado Springs Utilities | CSU service conditions and commercial project program eligibility | Official program / tariff |
| Atmos Energy Colorado | Atmos operating area and transportation agreement conditions | Official program / tariff |
Xcel Energy / Public Service Company of Colorado: the program detail behind this decision
Public Service Company of Colorado lists separate small and large commercial sales schedules and small and large firm transportation schedules. A transportation tariff is an operating arrangement with its own terms; an Xcel electricity account or another distributor’s gas contract does not qualify the premises. Xcel Co Tariff.
Apply the evidence to an account file
Resolve CSG or CLG sales compared with the applicable TFS or TFL transportation schedule first. The utility or accepted agent must confirm Transportation agreement, capacity, nominations and imbalance responsibility. Retain that answer alongside the named accounts before requesting bids.
An enrollment file that can be handed to another reviewer
Build six fields before seeking a signature: legal gas company; commercial rate code; eligible service arrangement; regulator authorization where required; utility-active supplier or agent; and accepted account/start-date confirmation. Attach the source date and the person who answered each unresolved question. A directory entry belongs in the authorization field, not the accepted-enrollment field. If an account remains on bundled utility service, document that result instead of forcing the review to select a supplier.
Turn the review into a calculation
Plan notice and enrollment milestones. The planner uses your calendar-day inputs and does not send notices or confirm a utility enrollment date.
Read the Colorado utility guide for the wider service-company distinctions. Convert billed gas units using the bill’s heat-content factor when moving from volume to energy.
Sources and review notes
- EIA: natural gas customer choice and eligibility
- Xcel Energy Colorado gas tariff
- Castle Rock Gas
- Colorado Springs Gas
- City of Greeley: local utility directory
Reviewed October 16, 2026. Program information can change. Confirm the effective utility tariff, supplier availability and written offer before proceeding. Examples and planning tools are educational; they are not executable quotes or verified customer results.