Revised Patua geothermal interconnect deal calls for solar capacity

Sierra Pacific Power d/b/a NV Energy filed on Nov. 9 at the Federal Energy Regulatory Commission an executed Amended and Restated Standard Large Generator Interconnection Agreement with geothermal developer Patua Acquisition Co. LLC.

The Amended and Restated LGIA reflects revisions agreed upon by both parties to provide for updated facilities and a new configuration that resulted in both design and timing changes.

In May 2011, the parties executed a pro forma LGIA. That Original LGIA established the terms and condition pursuant to which Sierra Pacific would provide interconnection service for Patua’s proposed 60 net MW geothermal power project. In late 2011, Patua requested revisions to reflect both timing and design changes. Specifically, Patua requested to increase the generation from 60 MW net (following an additional interconnection request with associated queue position for the 11 MW net increase and subsequent studies to accommodate this request) to 71 MW net of geothermal power, substation design changes, updated cost estimates to reflect the design changes, and milestone updates to reflect scheduling changes. The parties filed the resulting changes to the Original LGIA with FERC.

More recently, Patua has requested revisions to the agreement to reflect new timing and design changes. Specifically, Patua requested to decrease the generation from 71 net MW to 40 net MW of geothermal power. Based on this request, the parties have agreed to revise various parts of the LGIA. These changes do not require any changes to Sierra Pacific’s interconnection facilities or the network upgrades associated with Patua’s geothermal power project.

The project’s two phases under the current configuration are:

  • Phase 1 – geothermal nameplate 56.475 MVA from three 18.825 MVA generators that have been installed and went into service in 2013; and
  • Phase 2 – nameplate 10.5 MVA from twenty-one 500 kW Solectria SGI 500XTM inverters, photovoltaic solar, due to be in-service in May 2017.

The Point of Interconnection will be the point where the #176 terminal intersects the 120-kV bus at the existing Eagle Substation.

A project contact is: Patua Acquisition Co. LLC, Attention: Patua Project – Transmission Manager, 136 South Main Street, Suite 600, Salt Lake City, UT 84032, Phone: (801) 875-4200,

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.