Arizona Public Service files agreements with three solar projects

Arizona Public Service (APS) on July 14 filed with the Federal Energy Regulatory Commission non-conforming Large Generator Interconnection Agreements with Hyder Solar 1 LLC (queue position Q58), Hyder Solar 2 LLC (Q59) and Hyder Solar 3 LLC (Q60).

APS, the Imperial Irrigation District (IID), San Diego Gas & Electric and the California ISO are counter-parties to each of these agreements.

In December 2008, Hyder submitted three requests to APS seeking to interconnect three solar facilities into the Hassayampa–North Gila 500-kV transmission line. The line is part of the Arizona Transmission System, a joint participant transmission system owned, in varying percentages by APS, IID and SDG&E. The project locations are near Hyder in Yuma County, Ariz.

The Hyder projects entered the CAISO queue in July 2010. However, they were withdrawn from the CAISO queue in September 2011 as a result of their failure to make the required financial security postings in accordance with the CAISO’s generation interconnection procedures.

APS said the parties since then have been successful in reaching agreement with respect to all but one provision of the attached agreements. Specifically, Hyder contests the requirement that it enter the CAISO interconnection queue. CAISO and SDG&E assert this obligation is an essential element of the interconnections and corresponding agreements because certain portions of the transmission system providing interconnection service, as well as certain portions of the network upgrades and transmission owners’ interconnection facilities, are owned in part by SDG&E and operated by the CAISO. Moreover, the Hassayampa–North Gila transmission line is located within the CAISO Balancing Authority Area. Hyder disagrees and instead believes that interconnection may be accomplished via the APS queue only. APS, IID, CAISO and SDG&E support the execution of a five-party agreement.

Hyder, through its parent company NRG Renew LLC, submitted a written request to APS on June 27 asking that APS file unexecuted copies of the agreements with the commission.

Hyder has requested that the interconnection of the Q58 project would be joined with the interconnection of the Q59 and Q60 projects. All three projects would collect at a common “off-site” 69-kV switchyard and jointly own a common 69/500-kV transformer, which would then require a single 500-kV connection to the Hassayampa–North Gila 500-kV line at the proposed Qx switchyard.

The maximum allowable injection of power into the switchyard at the point of interconnection for the generating facilities is 238 MW. Q58 is 99 MW in size, Q59 is 99 MW and Q60 is 40 MW. The commercial operation date for each is July 31, 2017, or such alternative date that is consistent with the IID construction schedule for completion of distribution upgrades.

A project contact is: NRG Solar LLC, Attn: Doug Haroldson, 5790 Fleet Street, Suite 200, Carlsbad, CA 92008.

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.