Questar Pipeline Co. is seeking Federal Energy Regulatory Commission approval to provide open-access natural gas storage service at its Clay Basin storage field in the northeastern corner of Utah near the Utah-Wyoming state line.

The company, a subsidiary of Salt Lake-based Questar Corp., wants to begin the service May 15.The Clay Basin storage field has been in operation since 1976 and has provided contract storage service to Northwest Pipeline Corp. in addition to storage for Questar Pipeline's system operations. It has a current annual injection capacity of 30 billion cubic feet, about one-third of which would be marketed to new customers under the requested open-access storage certificate.

If FERC is unable to act formally on the petition by May 15, the company wants interim authorization to proceed with its plan.

Questar Pipeline will be accepting storage requests for both firm and interruptible storage service through March 31. Any additional storage capacity available after March 31 will be offered on a first-come, first-served basis. The company plans to begin notifying potential customers of any available interruptible storage capacity beginning May 1.