Southwest Power Pool files interconnect deal for Clean Line transmission project

The Southwest Power Pool on Nov. 30 filed with the Federal Energy Regulatory Commission an executed interconnection agreement between Plains and Eastern Clean Line Oklahoma LLC and interconnecting transmission owner Southwestern Public Service Co. (SPS) for a major transmission line designed to wheel wind power out of the Oklahoma region. 

Clean Line is proposing to construct, own and operate an overhead 600-kV high voltage direct current electric transmission system and associated facilities with the capacity to deliver approximately 3,500 MW–4,000 MW, primarily from renewable energy generation facilities in the Oklahoma panhandle region to load-serving entities in the Mid-South and Southeast via an interconnection with the Tennessee Valley Authority and Midcontinent Independent System Operator.

Studies for interconnection have been completed for levels up to transfer levels of 3,500 MW. Any proposed operation above 3,500 MW will be analyzed in subsequent studies and may require additional interconnection facilities for which Clean Line will be responsible.

SPS is a public utility in the business of generating, transmitting and/or selling electric energy in the states of Texas, New Mexico, Oklahoma and Kansas. SPS is a transmission owning member of SPP and has transferred functional control of its transmission system to SPP.

Clean Line retained Power Technologies Inc. (PTI) to perform a system impact study for the Clean Line interconnection (PTI Study). SPP retained Excel Engineering to perform an independent stability study and for an independent analysis of the PTI Study. SPS performed the Facilities Study for the project. The interconnection facilities and network upgrades necessary for interconnection as identified in the SPS Facilities Study are identified in the agreement.

The parties have agreed that prior to the Clean Line project achieving the targeted commercial operation date, additional design level studies and analysis should be performed. The additional studies and analysis are identified in the agreement. That includes a Clean Line need to perform additional power-flow studies, stability studies, a sub-synchronous resonance study, and harmonic interaction studies.

No specific commercial operation date is given in the agreement, with that date dependent on the completion of prior steps.

Project contact information given in the agreement is: Executive Vice President–Transmission and Technical Service, Clean Line Energy Partners LLC, 1001 McKinney Street, Suite 700, Houston, Texas 77002.

About Barry Cassell 20414 Articles
Barry Cassell is Chief Analyst for GenerationHub covering coal and emission controls issues, projects and policy. He has covered the coal and power generation industry for more than 24 years, beginning in November 2011 at GenerationHub and prior to that as editor of SNL Energy’s Coal Report. He was formerly with Coal Outlook for 15 years as the publication’s editor and contributing writer, and prior to that he was editor of Coal & Synfuels Technology and associate editor of The Energy Report. He has a bachelor’s degree from Central Michigan University.