# Alta Wind Energy Center I

CAISO Onshore Wind Turbine · https://askthegrid.com/assets/facilities/alta-wind-energy-center-i

Alta Wind Energy Center I is a wind power facility with 150 MW of EIA-reported operating capacity in Kern County, California, registered as EIA Plant ID 57282. Alta Wind I, LLC is the registered plant entity or operator. Commercial operation began in January 2011.

## Key facts

- Technology: Onshore Wind Turbine
- Power capacity: 150 MW
- Operating status: operating

## Grid and market context

- ISO/RTO: CAISO
- Balancing authority: CISO
- Substation: Windhub Substation
- Point of interconnection: Windhub Substation
- Transmission owner: Southern California Edison Co.
- Interconnection voltage: 220 kV

## Source-backed facts

- Identifiers: [{"value":"57282","system":"EIA plant ID"},{"value":"AW01","system":"EIA generator ID"},{"value":"CISO","system":"Balancing authority"},{"value":"CAISO","system":"ISO/RTO power market"},{"value":"Alta Wind 1","system":"CAISO market resource"},{"value":"10-43-000","system":"FERC exempt wholesale generator docket"},{"value":"EL10-62-000","system":"FERC declaratory-order docket"},{"value":"ER10-2086-001","system":"FERC MBR docket"}] — Curtailed and Non-Operational Generator AM Report Nov... · confidence: medium
- Identifiers.4: {"value":"Alta Wind 1","system":"CAISO market resource"} — Curtailed and Non-Operational Generator AM Report Nov... · confidence: medium
- Parties.2: {"relationship":"Developer","name":"Terra-Gen Power LLC","official_url":"https://terra-gen.com"} — Wind Energy - Terra-Gen · confidence: medium
- Parties.4: {"relationship":"EPC contractor","name":"Balfour Wind Energy Constructors (BWEC)","official_url":null} — California wind project builder takes on all kinds of weather with phase one of Alta Wind: Back Issues, altenerG.com - enerG Alternative Sources Magazine - enerG, Archives · confidence: medium
- Product url: https://www.gevernova.com/wind-power/wind-turbines — Wind Turbine Portfolio | GE Vernova · confidence: medium
- Significance: Alta Wind Energy Center I was the first 150 MW phase of the Alta Wind complex, which was described in 2014 as North America's largest wind farm; the related operating portfolio sold to NRG Yield totaled 947 MW. — Terra-Gen gets $115mn in financing for 150 MW project · confidence: medium
- Significance: Alta Wind Energy Center I was the first 150 MW phase of the Alta Wind complex, which was described in 2014 as North America's largest wind farm; the related operating portfolio sold to NRG Yield totaled 947 MW. — Terra-Gen Power Announces Sale of Alta Wind to NRG Yield · confidence: medium
- Description: Alta Wind Energy Center I is an operational 150 MW onshore wind plant in Kern County, California, with one EIA generating unit, AW01, operating in the CISO balancing authority and CAISO market. The unit entered service in January 2011 and uses GE 1.5 SLE turbines. Terra-Gen developed the project after acquiring the Alta development platform from Allco Finance in June 2008. Alta I was included in Terra-Gen's August 2014 sale of the Alta I-V, X, XI, and Realty assets to NRG Yield, now associated with the Clearway Energy platform; Alta Wind I, LLC remains the named operator. — Terra-Gen Power Announces Sale of Alta Wind to NRG Yield · confidence: medium
- Quality notes: ["The $870 million consideration and approximately $1.6 billion of assumed non-recourse project financing applied to the 947 MW Alta portfolio, not to Alta Wind Energy Center I alone.","The separate $1.2 billion construction financing involving approximately $580 million of pass-through certificates, a $499 million bridge facility, and $127 million of ancillary facilities was for Alta Projects II-V and is not attributed to Alta I.","The current plant record remains one operational 150 MW unit; no distinct expansion, retirement, or repowering event is identified for EIA plant 57282 in the cited history."] — Simpson Thacher Wins “North American Wind Deal of the Year 2010” by Project Finance Magazine · confidence: medium
- Financing summary: Alta I received $115 million of a planned $140 million pre-construction financing in July 2009 to purchase 100 GE turbines. Its project financing had closed by March 2010, when construction began. In December 2010, Terra-Gen completed an Alta I sale-leaseback in which GE and UBOC participated as equal co-investors; the cited record does not disclose the Alta I transaction amount. Separately, NRG Yield's August 2014 acquisition of the 947 MW Alta portfolio involved $870 million of purchase consideration plus approximately $1.6 billion of assumed non-recourse project financings. NRG Yield funded the acquisition with $630 million of net proceeds from a July 29, 2014 equity issuance and $500 million of senior notes issued August 5, 2014. — Terra-Gen gets $115mn in financing for 150 MW project · confidence: medium
- Financing summary: Alta I received $115 million of a planned $140 million pre-construction financing in July 2009 to purchase 100 GE turbines. Its project financing had closed by March 2010, when construction began. In December 2010, Terra-Gen completed an Alta I sale-leaseback in which GE and UBOC participated as equal co-investors; the cited record does not disclose the Alta I transaction amount. Separately, NRG Yield's August 2014 acquisition of the 947 MW Alta portfolio involved $870 million of purchase consideration plus approximately $1.6 billion of assumed non-recourse project financings. NRG Yield funded the acquisition with $630 million of net proceeds from a July 29, 2014 equity issuance and $500 million of senior notes issued August 5, 2014. — Terra-Gen Power Announces Closing of $1.2 Billion Construction Financing and Wind Turbine Order - EnergyTrend · confidence: medium
- Financing summary: Alta I received $115 million of a planned $140 million pre-construction financing in July 2009 to purchase 100 GE turbines. Its project financing had closed by March 2010, when construction began. In December 2010, Terra-Gen completed an Alta I sale-leaseback in which GE and UBOC participated as equal co-investors; the cited record does not disclose the Alta I transaction amount. Separately, NRG Yield's August 2014 acquisition of the 947 MW Alta portfolio involved $870 million of purchase consideration plus approximately $1.6 billion of assumed non-recourse project financings. NRG Yield funded the acquisition with $630 million of net proceeds from a July 29, 2014 equity issuance and $500 million of senior notes issued August 5, 2014. — In the United States Court of Federal Claims · confidence: medium
- Financing summary: Alta I received $115 million of a planned $140 million pre-construction financing in July 2009 to purchase 100 GE turbines. Its project financing had closed by March 2010, when construction began. In December 2010, Terra-Gen completed an Alta I sale-leaseback in which GE and UBOC participated as equal co-investors; the cited record does not disclose the Alta I transaction amount. Separately, NRG Yield's August 2014 acquisition of the 947 MW Alta portfolio involved $870 million of purchase consideration plus approximately $1.6 billion of assumed non-recourse project financings. NRG Yield funded the acquisition with $630 million of net proceeds from a July 29, 2014 equity issuance and $500 million of senior notes issued August 5, 2014. — Source · confidence: medium
- Timeline: [{"event":"Alta development platform acquired","date":"2008-06","detail":"Terra-Gen acquired the Alta Wind Energy Center development platform from Allco Finance."},{"event":"Pre-construction turbine financing","date":"2009-07","detail":"Terra-Gen closed $115 million of a planned $140 million pre-construction financing to purchase 100 GE 1.5 MW SLE turbines for the 150 MW Alta Wind I project."},{"event":"Project financing and construction commenced","date":"2010-03","detail":"Alta Project I had closed financing and commenced construction."},{"event":"Alta I sale-leaseback","date":"2010-12","detail":"Terra-Gen completed a sale-leaseback for Alta I; GE and UBOC formed a consortium to participate as equal co-investors."},{"event":"Commercial operation","date":"2011-01","detail":"Alta Project I was anticipated to begin commercial operations in January 2011, and the plant record identifies AW01 as operating from January 2011."},{"event":"Sale agreement announced","date":"2014-06-04","detail":"Terra-Gen announced an agreement to sell its 947 MW Alta Wind I-V, X, XI, and Realty projects to NRG Yield."},{"event":"Portfolio acquisition closed","date":"2014-08-12","detail":"NRG Yield completed its acquisition of the Alta Wind assets from Terra-Gen for $870 million plus assumed non-recourse project financings and working-capital adjustments."},{"event":"Current operating status","date":"2026-08-02","detail":"The latest cited plant record identifies Alta Wind Energy Center I as operational at 150 MW with one generating unit; no separate expansion, retirement, or repowering milestone is recorded."}] — Terra-Gen Power Announces Sale of Alta Wind to NRG Yield · confidence: medium
- Timeline: [{"event":"Alta development platform acquired","date":"2008-06","detail":"Terra-Gen acquired the Alta Wind Energy Center development platform from Allco Finance."},{"event":"Pre-construction turbine financing","date":"2009-07","detail":"Terra-Gen closed $115 million of a planned $140 million pre-construction financing to purchase 100 GE 1.5 MW SLE turbines for the 150 MW Alta Wind I project."},{"event":"Project financing and construction commenced","date":"2010-03","detail":"Alta Project I had closed financing and commenced construction."},{"event":"Alta I sale-leaseback","date":"2010-12","detail":"Terra-Gen completed a sale-leaseback for Alta I; GE and UBOC formed a consortium to participate as equal co-investors."},{"event":"Commercial operation","date":"2011-01","detail":"Alta Project I was anticipated to begin commercial operations in January 2011, and the plant record identifies AW01 as operating from January 2011."},{"event":"Sale agreement announced","date":"2014-06-04","detail":"Terra-Gen announced an agreement to sell its 947 MW Alta Wind I-V, X, XI, and Realty projects to NRG Yield."},{"event":"Portfolio acquisition closed","date":"2014-08-12","detail":"NRG Yield completed its acquisition of the Alta Wind assets from Terra-Gen for $870 million plus assumed non-recourse project financings and working-capital adjustments."},{"event":"Current operating status","date":"2026-08-02","detail":"The latest cited plant record identifies Alta Wind Energy Center I as operational at 150 MW with one generating unit; no separate expansion, retirement, or repowering milestone is recorded."}] — Terra-Gen gets $115mn in financing for 150 MW project · confidence: medium
- Timeline: [{"event":"Alta development platform acquired","date":"2008-06","detail":"Terra-Gen acquired the Alta Wind Energy Center development platform from Allco Finance."},{"event":"Pre-construction turbine financing","date":"2009-07","detail":"Terra-Gen closed $115 million of a planned $140 million pre-construction financing to purchase 100 GE 1.5 MW SLE turbines for the 150 MW Alta Wind I project."},{"event":"Project financing and construction commenced","date":"2010-03","detail":"Alta Project I had closed financing and commenced construction."},{"event":"Alta I sale-leaseback","date":"2010-12","detail":"Terra-Gen completed a sale-leaseback for Alta I; GE and UBOC formed a consortium to participate as equal co-investors."},{"event":"Commercial operation","date":"2011-01","detail":"Alta Project I was anticipated to begin commercial operations in January 2011, and the plant record identifies AW01 as operating from January 2011."},{"event":"Sale agreement announced","date":"2014-06-04","detail":"Terra-Gen announced an agreement to sell its 947 MW Alta Wind I-V, X, XI, and Realty projects to NRG Yield."},{"event":"Portfolio acquisition closed","date":"2014-08-12","detail":"NRG Yield completed its acquisition of the Alta Wind assets from Terra-Gen for $870 million plus assumed non-recourse project financings and working-capital adjustments."},{"event":"Current operating status","date":"2026-08-02","detail":"The latest cited plant record identifies Alta Wind Energy Center I as operational at 150 MW with one generating unit; no separate expansion, retirement, or repowering milestone is recorded."}] — Terra-Gen Power Announces Closing of $1.2 Billion Construction Financing and Wind Turbine Order - EnergyTrend · confidence: medium
- Timeline: [{"event":"Alta development platform acquired","date":"2008-06","detail":"Terra-Gen acquired the Alta Wind Energy Center development platform from Allco Finance."},{"event":"Pre-construction turbine financing","date":"2009-07","detail":"Terra-Gen closed $115 million of a planned $140 million pre-construction financing to purchase 100 GE 1.5 MW SLE turbines for the 150 MW Alta Wind I project."},{"event":"Project financing and construction commenced","date":"2010-03","detail":"Alta Project I had closed financing and commenced construction."},{"event":"Alta I sale-leaseback","date":"2010-12","detail":"Terra-Gen completed a sale-leaseback for Alta I; GE and UBOC formed a consortium to participate as equal co-investors."},{"event":"Commercial operation","date":"2011-01","detail":"Alta Project I was anticipated to begin commercial operations in January 2011, and the plant record identifies AW01 as operating from January 2011."},{"event":"Sale agreement announced","date":"2014-06-04","detail":"Terra-Gen announced an agreement to sell its 947 MW Alta Wind I-V, X, XI, and Realty projects to NRG Yield."},{"event":"Portfolio acquisition closed","date":"2014-08-12","detail":"NRG Yield completed its acquisition of the Alta Wind assets from Terra-Gen for $870 million plus assumed non-recourse project financings and working-capital adjustments."},{"event":"Current operating status","date":"2026-08-02","detail":"The latest cited plant record identifies Alta Wind Energy Center I as operational at 150 MW with one generating unit; no separate expansion, retirement, or repowering milestone is recorded."}] — In the United States Court of Federal Claims · confidence: medium
- Commercial parties: [{"relationship":"Current owner platform / 2014 acquirer","name":"NRG Yield, Inc. (now Clearway Energy, Inc.)","detail":"Completed the August 2014 acquisition of the Alta Wind assets from Terra-Gen for $870 million plus assumed project financings; the acquired portfolio included Alta I-V, X, XI, and related land leases.","official_url":"https://investor.clearwayenergy.com"},{"relationship":"Operator","name":"Alta Wind I, LLC","detail":"Named operator of the 150 MW Alta Wind Energy Center I plant and its AW01 generating unit.","official_url":null},{"relationship":"Developer and former seller","name":"Terra-Gen Power LLC","detail":"Acquired the Alta development platform from Allco Finance, developed and constructed the Alta projects, and sold the 947 MW Alta portfolio to NRG Yield in 2014. Terra-Gen Operating Company continued providing asset-management and operations-and-maintenance services after the sale.","official_url":"https://terra-gen.com"},{"relationship":"Predecessor development-platform owner","name":"Allco Finance","detail":"Predecessor owner from which Terra-Gen acquired the Alta Wind Energy Center development platform in June 2008.","official_url":null},{"relationship":"Historical Terra-Gen sponsor","name":"ArcLight Capital Partners","detail":"Terra-Gen was described as an affiliate of ArcLight Capital Partners; ArcLight and its co-investors held a controlling interest in Terra-Gen at the time of the 2014 sale announcement.","official_url":"https://arclight.com"},{"relationship":"Historical Terra-Gen sponsor","name":"Global Infrastructure Partners","detail":"Terra-Gen was described as affiliated with Global Infrastructure Partners, which was among the infrastructure-investment sponsors associated with the Alta platform before the 2014 sale.","official_url":"https://www.global-infra.com"},{"relationship":"Turbine OEM","name":"GE","detail":"Supplied the GE 1.5 SLE turbines used for Alta Wind I; the 2009 financing announcement described the purchase of 100 turbines for the 150 MW project.","official_url":"https://www.gevernova.com"},{"relationship":"Sale-leaseback co-investor","name":"UBOC","detail":"Participated with GE as an equal co-investor in the December 2010 Alta I sale-leaseback; the cited record does not expand the UBOC abbreviation or provide a current official website.","official_url":null},{"relationship":"Power purchaser","name":"Southern California Edison","detail":"Alta I-V generated power under long-term power purchase agreements with Southern California Edison.","official_url":"https://www.sce.com"}] — Terra-Gen Power Announces Sale of Alta Wind to NRG Yield · confidence: medium
- Commercial parties: [{"relationship":"Current owner platform / 2014 acquirer","name":"NRG Yield, Inc. (now Clearway Energy, Inc.)","detail":"Completed the August 2014 acquisition of the Alta Wind assets from Terra-Gen for $870 million plus assumed project financings; the acquired portfolio included Alta I-V, X, XI, and related land leases.","official_url":"https://investor.clearwayenergy.com"},{"relationship":"Operator","name":"Alta Wind I, LLC","detail":"Named operator of the 150 MW Alta Wind Energy Center I plant and its AW01 generating unit.","official_url":null},{"relationship":"Developer and former seller","name":"Terra-Gen Power LLC","detail":"Acquired the Alta development platform from Allco Finance, developed and constructed the Alta projects, and sold the 947 MW Alta portfolio to NRG Yield in 2014. Terra-Gen Operating Company continued providing asset-management and operations-and-maintenance services after the sale.","official_url":"https://terra-gen.com"},{"relationship":"Predecessor development-platform owner","name":"Allco Finance","detail":"Predecessor owner from which Terra-Gen acquired the Alta Wind Energy Center development platform in June 2008.","official_url":null},{"relationship":"Historical Terra-Gen sponsor","name":"ArcLight Capital Partners","detail":"Terra-Gen was described as an affiliate of ArcLight Capital Partners; ArcLight and its co-investors held a controlling interest in Terra-Gen at the time of the 2014 sale announcement.","official_url":"https://arclight.com"},{"relationship":"Historical Terra-Gen sponsor","name":"Global Infrastructure Partners","detail":"Terra-Gen was described as affiliated with Global Infrastructure Partners, which was among the infrastructure-investment sponsors associated with the Alta platform before the 2014 sale.","official_url":"https://www.global-infra.com"},{"relationship":"Turbine OEM","name":"GE","detail":"Supplied the GE 1.5 SLE turbines used for Alta Wind I; the 2009 financing announcement described the purchase of 100 turbines for the 150 MW project.","official_url":"https://www.gevernova.com"},{"relationship":"Sale-leaseback co-investor","name":"UBOC","detail":"Participated with GE as an equal co-investor in the December 2010 Alta I sale-leaseback; the cited record does not expand the UBOC abbreviation or provide a current official website.","official_url":null},{"relationship":"Power purchaser","name":"Southern California Edison","detail":"Alta I-V generated power under long-term power purchase agreements with Southern California Edison.","official_url":"https://www.sce.com"}] — Terra-Gen: Home · confidence: medium
- Commercial parties: [{"relationship":"Current owner platform / 2014 acquirer","name":"NRG Yield, Inc. (now Clearway Energy, Inc.)","detail":"Completed the August 2014 acquisition of the Alta Wind assets from Terra-Gen for $870 million plus assumed project financings; the acquired portfolio included Alta I-V, X, XI, and related land leases.","official_url":"https://investor.clearwayenergy.com"},{"relationship":"Operator","name":"Alta Wind I, LLC","detail":"Named operator of the 150 MW Alta Wind Energy Center I plant and its AW01 generating unit.","official_url":null},{"relationship":"Developer and former seller","name":"Terra-Gen Power LLC","detail":"Acquired the Alta development platform from Allco Finance, developed and constructed the Alta projects, and sold the 947 MW Alta portfolio to NRG Yield in 2014. Terra-Gen Operating Company continued providing asset-management and operations-and-maintenance services after the sale.","official_url":"https://terra-gen.com"},{"relationship":"Predecessor development-platform owner","name":"Allco Finance","detail":"Predecessor owner from which Terra-Gen acquired the Alta Wind Energy Center development platform in June 2008.","official_url":null},{"relationship":"Historical Terra-Gen sponsor","name":"ArcLight Capital Partners","detail":"Terra-Gen was described as an affiliate of ArcLight Capital Partners; ArcLight and its co-investors held a controlling interest in Terra-Gen at the time of the 2014 sale announcement.","official_url":"https://arclight.com"},{"relationship":"Historical Terra-Gen sponsor","name":"Global Infrastructure Partners","detail":"Terra-Gen was described as affiliated with Global Infrastructure Partners, which was among the infrastructure-investment sponsors associated with the Alta platform before the 2014 sale.","official_url":"https://www.global-infra.com"},{"relationship":"Turbine OEM","name":"GE","detail":"Supplied the GE 1.5 SLE turbines used for Alta Wind I; the 2009 financing announcement described the purchase of 100 turbines for the 150 MW project.","official_url":"https://www.gevernova.com"},{"relationship":"Sale-leaseback co-investor","name":"UBOC","detail":"Participated with GE as an equal co-investor in the December 2010 Alta I sale-leaseback; the cited record does not expand the UBOC abbreviation or provide a current official website.","official_url":null},{"relationship":"Power purchaser","name":"Southern California Edison","detail":"Alta I-V generated power under long-term power purchase agreements with Southern California Edison.","official_url":"https://www.sce.com"}] — Core Sector Focus · confidence: medium
- Commercial parties: [{"relationship":"Current owner platform / 2014 acquirer","name":"NRG Yield, Inc. (now Clearway Energy, Inc.)","detail":"Completed the August 2014 acquisition of the Alta Wind assets from Terra-Gen for $870 million plus assumed project financings; the acquired portfolio included Alta I-V, X, XI, and related land leases.","official_url":"https://investor.clearwayenergy.com"},{"relationship":"Operator","name":"Alta Wind I, LLC","detail":"Named operator of the 150 MW Alta Wind Energy Center I plant and its AW01 generating unit.","official_url":null},{"relationship":"Developer and former seller","name":"Terra-Gen Power LLC","detail":"Acquired the Alta development platform from Allco Finance, developed and constructed the Alta projects, and sold the 947 MW Alta portfolio to NRG Yield in 2014. Terra-Gen Operating Company continued providing asset-management and operations-and-maintenance services after the sale.","official_url":"https://terra-gen.com"},{"relationship":"Predecessor development-platform owner","name":"Allco Finance","detail":"Predecessor owner from which Terra-Gen acquired the Alta Wind Energy Center development platform in June 2008.","official_url":null},{"relationship":"Historical Terra-Gen sponsor","name":"ArcLight Capital Partners","detail":"Terra-Gen was described as an affiliate of ArcLight Capital Partners; ArcLight and its co-investors held a controlling interest in Terra-Gen at the time of the 2014 sale announcement.","official_url":"https://arclight.com"},{"relationship":"Historical Terra-Gen sponsor","name":"Global Infrastructure Partners","detail":"Terra-Gen was described as affiliated with Global Infrastructure Partners, which was among the infrastructure-investment sponsors associated with the Alta platform before the 2014 sale.","official_url":"https://www.global-infra.com"},{"relationship":"Turbine OEM","name":"GE","detail":"Supplied the GE 1.5 SLE turbines used for Alta Wind I; the 2009 financing announcement described the purchase of 100 turbines for the 150 MW project.","official_url":"https://www.gevernova.com"},{"relationship":"Sale-leaseback co-investor","name":"UBOC","detail":"Participated with GE as an equal co-investor in the December 2010 Alta I sale-leaseback; the cited record does not expand the UBOC abbreviation or provide a current official website.","official_url":null},{"relationship":"Power purchaser","name":"Southern California Edison","detail":"Alta I-V generated power under long-term power purchase agreements with Southern California Edison.","official_url":"https://www.sce.com"}] — Global Infrastructure Partners - A leading infrastructure investor. · confidence: medium
- Commercial parties: [{"relationship":"Current owner platform / 2014 acquirer","name":"NRG Yield, Inc. (now Clearway Energy, Inc.)","detail":"Completed the August 2014 acquisition of the Alta Wind assets from Terra-Gen for $870 million plus assumed project financings; the acquired portfolio included Alta I-V, X, XI, and related land leases.","official_url":"https://investor.clearwayenergy.com"},{"relationship":"Operator","name":"Alta Wind I, LLC","detail":"Named operator of the 150 MW Alta Wind Energy Center I plant and its AW01 generating unit.","official_url":null},{"relationship":"Developer and former seller","name":"Terra-Gen Power LLC","detail":"Acquired the Alta development platform from Allco Finance, developed and constructed the Alta projects, and sold the 947 MW Alta portfolio to NRG Yield in 2014. Terra-Gen Operating Company continued providing asset-management and operations-and-maintenance services after the sale.","official_url":"https://terra-gen.com"},{"relationship":"Predecessor development-platform owner","name":"Allco Finance","detail":"Predecessor owner from which Terra-Gen acquired the Alta Wind Energy Center development platform in June 2008.","official_url":null},{"relationship":"Historical Terra-Gen sponsor","name":"ArcLight Capital Partners","detail":"Terra-Gen was described as an affiliate of ArcLight Capital Partners; ArcLight and its co-investors held a controlling interest in Terra-Gen at the time of the 2014 sale announcement.","official_url":"https://arclight.com"},{"relationship":"Historical Terra-Gen sponsor","name":"Global Infrastructure Partners","detail":"Terra-Gen was described as affiliated with Global Infrastructure Partners, which was among the infrastructure-investment sponsors associated with the Alta platform before the 2014 sale.","official_url":"https://www.global-infra.com"},{"relationship":"Turbine OEM","name":"GE","detail":"Supplied the GE 1.5 SLE turbines used for Alta Wind I; the 2009 financing announcement described the purchase of 100 turbines for the 150 MW project.","official_url":"https://www.gevernova.com"},{"relationship":"Sale-leaseback co-investor","name":"UBOC","detail":"Participated with GE as an equal co-investor in the December 2010 Alta I sale-leaseback; the cited record does not expand the UBOC abbreviation or provide a current official website.","official_url":null},{"relationship":"Power purchaser","name":"Southern California Edison","detail":"Alta I-V generated power under long-term power purchase agreements with Southern California Edison.","official_url":"https://www.sce.com"}] — Terra-Gen gets $115mn in financing for 150 MW project · confidence: medium
- Commercial parties: [{"relationship":"Current owner platform / 2014 acquirer","name":"NRG Yield, Inc. (now Clearway Energy, Inc.)","detail":"Completed the August 2014 acquisition of the Alta Wind assets from Terra-Gen for $870 million plus assumed project financings; the acquired portfolio included Alta I-V, X, XI, and related land leases.","official_url":"https://investor.clearwayenergy.com"},{"relationship":"Operator","name":"Alta Wind I, LLC","detail":"Named operator of the 150 MW Alta Wind Energy Center I plant and its AW01 generating unit.","official_url":null},{"relationship":"Developer and former seller","name":"Terra-Gen Power LLC","detail":"Acquired the Alta development platform from Allco Finance, developed and constructed the Alta projects, and sold the 947 MW Alta portfolio to NRG Yield in 2014. Terra-Gen Operating Company continued providing asset-management and operations-and-maintenance services after the sale.","official_url":"https://terra-gen.com"},{"relationship":"Predecessor development-platform owner","name":"Allco Finance","detail":"Predecessor owner from which Terra-Gen acquired the Alta Wind Energy Center development platform in June 2008.","official_url":null},{"relationship":"Historical Terra-Gen sponsor","name":"ArcLight Capital Partners","detail":"Terra-Gen was described as an affiliate of ArcLight Capital Partners; ArcLight and its co-investors held a controlling interest in Terra-Gen at the time of the 2014 sale announcement.","official_url":"https://arclight.com"},{"relationship":"Historical Terra-Gen sponsor","name":"Global Infrastructure Partners","detail":"Terra-Gen was described as affiliated with Global Infrastructure Partners, which was among the infrastructure-investment sponsors associated with the Alta platform before the 2014 sale.","official_url":"https://www.global-infra.com"},{"relationship":"Turbine OEM","name":"GE","detail":"Supplied the GE 1.5 SLE turbines used for Alta Wind I; the 2009 financing announcement described the purchase of 100 turbines for the 150 MW project.","official_url":"https://www.gevernova.com"},{"relationship":"Sale-leaseback co-investor","name":"UBOC","detail":"Participated with GE as an equal co-investor in the December 2010 Alta I sale-leaseback; the cited record does not expand the UBOC abbreviation or provide a current official website.","official_url":null},{"relationship":"Power purchaser","name":"Southern California Edison","detail":"Alta I-V generated power under long-term power purchase agreements with Southern California Edison.","official_url":"https://www.sce.com"}] — In the United States Court of Federal Claims · confidence: medium
- Commercial parties.0: {"relationship":"Current owner platform / 2014 acquirer","name":"NRG Yield, Inc. (now Clearway Energy, Inc.)","detail":"Completed the August 2014 acquisition of the Alta Wind assets from Terra-Gen for $870 million plus assumed project financings; the acquired portfolio included Alta I-V, X, XI, and related land leases.","official_url":"https://investor.clearwayenergy.com"} — Terra-Gen gets $115mn in financing for 150 MW project · confidence: medium
- Commercial parties.2: {"relationship":"Developer and former seller","name":"Terra-Gen Power LLC","detail":"Acquired the Alta development platform from Allco Finance, developed and constructed the Alta projects, and sold the 947 MW Alta portfolio to NRG Yield in 2014. Terra-Gen Operating Company continued providing asset-management and operations-and-maintenance services after the sale.","official_url":"https://terra-gen.com"} — Terra-Gen Power Announces Sale of Alta Wind to NRG Yield · confidence: high
- Commercial parties.3: {"relationship":"Predecessor development-platform owner","name":"Allco Finance","detail":"Predecessor owner from which Terra-Gen acquired the Alta Wind Energy Center development platform in June 2008.","official_url":null} — Terra-Gen Power Announces Sale of Alta Wind to NRG Yield · confidence: medium
- Commercial parties.4: {"relationship":"Historical Terra-Gen sponsor","name":"ArcLight Capital Partners","detail":"Terra-Gen was described as an affiliate of ArcLight Capital Partners; ArcLight and its co-investors held a controlling interest in Terra-Gen at the time of the 2014 sale announcement.","official_url":"https://arclight.com"} — Terra-Gen Power Announces Sale of Alta Wind to NRG Yield · confidence: medium
- Commercial parties.5: {"relationship":"Historical Terra-Gen sponsor","name":"Global Infrastructure Partners","detail":"Terra-Gen was described as affiliated with Global Infrastructure Partners, which was among the infrastructure-investment sponsors associated with the Alta platform before the 2014 sale.","official_url":"https://www.global-infra.com"} — Terra-Gen Power Announces Sale of Alta Wind to NRG Yield · confidence: medium
- Commercial parties.6: {"relationship":"Turbine OEM","name":"GE","detail":"Supplied the GE 1.5 SLE turbines used for Alta Wind I; the 2009 financing announcement described the purchase of 100 turbines for the 150 MW project.","official_url":"https://www.gevernova.com"} — Terra-Gen gets $115mn in financing for 150 MW project · confidence: medium
- Commercial parties.7: {"relationship":"Sale-leaseback co-investor","name":"UBOC","detail":"Participated with GE as an equal co-investor in the December 2010 Alta I sale-leaseback; the cited record does not expand the UBOC abbreviation or provide a current official website.","official_url":null} — In the United States Court of Federal Claims · confidence: medium
- Timeline.0: {"event":"Alta development platform acquired","date":"2008-06","detail":"Terra-Gen acquired the Alta Wind Energy Center development platform from Allco Finance."} — Terra-Gen Power Announces Sale of Alta Wind to NRG Yield · confidence: high
- Timeline.1: {"event":"Pre-construction turbine financing","date":"2009-07","detail":"Terra-Gen closed $115 million of a planned $140 million pre-construction financing to purchase 100 GE 1.5 MW SLE turbines for the 150 MW Alta Wind I project."} — Terra-Gen gets $115mn in financing for 150 MW project · confidence: high
- Timeline.2: {"event":"Project financing and construction commenced","date":"2010-03","detail":"Alta Project I had closed financing and commenced construction."} — Terra-Gen Power Announces Closing of $1.2 Billion Construction Financing and Wind Turbine Order - EnergyTrend · confidence: high
- Timeline.3: {"event":"Alta I sale-leaseback","date":"2010-12","detail":"Terra-Gen completed a sale-leaseback for Alta I; GE and UBOC formed a consortium to participate as equal co-investors."} — In the United States Court of Federal Claims · confidence: medium
- Timeline.4: {"event":"Commercial operation","date":"2011-01","detail":"Alta Project I was anticipated to begin commercial operations in January 2011, and the plant record identifies AW01 as operating from January 2011."} — Terra-Gen Power Announces Closing of $1.2 Billion Construction Financing and Wind Turbine Order - EnergyTrend · confidence: high
- Timeline.5: {"event":"Sale agreement announced","date":"2014-06-04","detail":"Terra-Gen announced an agreement to sell its 947 MW Alta Wind I-V, X, XI, and Realty projects to NRG Yield."} — Terra-Gen Power Announces Sale of Alta Wind to NRG Yield · confidence: high
- Quality notes.1: The separate $1.2 billion construction financing involving approximately $580 million of pass-through certificates, a $499 million bridge facility, and $127 million of ancillary facilities was for Alta Projects II-V and is not attributed to Alta I. — Simpson Thacher Wins “North American Wind Deal of the Year 2010” by Project Finance Magazine · confidence: high
- Transaction scope: portfolio_includes_asset — Source · confidence: high

## Timeline

- 2008-06 — Alta development platform acquired
  Terra-Gen acquired the Alta Wind Energy Center development platform from Allco Finance.
  Source: Terra-Gen Power Announces Sale of Alta Wind to NRG Yield (https://www.prnewswire.com/news-releases/terra-gen-power-announces-sale-of-alta-wind-to-nrg-yield-261816311.html)
- 2010-03 — Project financing and construction commenced
  Alta Project I had closed financing and commenced construction.
  Source: Terra-Gen Power Announces Closing of $1.2 Billion Construction Financing and Wind Turbine Order - EnergyTrend (https://www.energytrend.com/news/20100723-394.html)
- 2011-01 — Planned commercial operation
  Alta Project I was anticipated to begin commercial operations in January 2011, and the plant record identifies AW01 as operating from January 2011.
  Source: Terra-Gen Power Announces Closing of $1.2 Billion Construction Financing and Wind Turbine Order - EnergyTrend (https://www.energytrend.com/news/20100723-394.html)
- 2014-06-04 — Sale agreement announced
  Terra-Gen announced an agreement to sell its 947 MW Alta Wind I-V, X, XI, and Realty projects to NRG Yield.
  Source: Terra-Gen Power Announces Sale of Alta Wind to NRG Yield (https://www.prnewswire.com/news-releases/terra-gen-power-announces-sale-of-alta-wind-to-nrg-yield-261816311.html)

## Sources

- [NRG Yield, Inc. Closes Acquisition of Largest Wind Farm in North America | Clearway Energy, Inc.](https://investor.clearwayenergy.com/news-releases/news-release-details/nrg-yield-inc-closes-acquisition-largest-wind-farm-north-america) — investor.clearwayenergy.com · tier other
- [Curtailed and Non-Operational Generator AM Report Nov ...](https://www.caiso.com/documents/curtailed-non-operational-generator-am-report-20191127.html) — caiso.com · tier other
- [Wind Energy - Terra-Gen](https://terra-gen.com/projects/wind-energy/) — terra-gen.com · tier other
- [California wind project builder takes on all kinds of weather with phase one of Alta Wind: Back Issues, altenerG.com - enerG Alternative Sources Magazine - enerG, Archives](https://www.altenerg.com/back_issues/novdec2011-story1.htm) — altenerg.com · tier other
- [Source](https://terra-gen.com/projects/wind-energy) — terra-gen.com · tier other
- [Alta Wind Energy Center (AWEC), California](https://www.power-technology.com/projects/alta-wind-energy-center-awec-california/) — power-technology.com · tier other
- [Wind Turbine Portfolio | GE Vernova](https://www.gevernova.com/wind-power/wind-turbines) — gevernova.com · tier other
- [Terra-Gen gets $115mn in financing for 150 MW project](https://www.power-eng.com/renewables/terra-gen-gets-115mn-in-financing-for-150-mw-project/) — power-eng.com · tier other
- [Terra-Gen Power Announces Sale of Alta Wind to NRG Yield](https://www.prnewswire.com/news-releases/terra-gen-power-announces-sale-of-alta-wind-to-nrg-yield-261816311.html) — prnewswire.com · tier other
- [Simpson Thacher Wins “North American Wind Deal of the Year 2010” by Project Finance Magazine](https://www.stblaw.com/about-us/news/view/2011/03/11/simpson-thacher-wins-north-american-wind-deal-of-the-year-2010-by-project-finance-magazine) — stblaw.com · tier other
- [Terra-Gen Power Announces Closing of $1.2 Billion Construction Financing and Wind Turbine Order - EnergyTrend](https://www.energytrend.com/news/20100723-394.html) — energytrend.com · tier other
- [In the United States Court of Federal Claims](https://www.novoco.com/public-media/documents/cr_alta_wind_decision_102416.pdf) — novoco.com · tier other
- [Source](https://www.sec.gov/Archives/edgar/data/1013871/000101387115000010/R10.htm) — sec.gov · tier regulatory
- [Terra-Gen: Home](https://terra-gen.com/) — terra-gen.com · tier other
- [Core Sector Focus](https://arclight.com/focus/) — arclight.com · tier other
- [Global Infrastructure Partners - A leading infrastructure investor.](https://www.global-infra.com/) — global-infra.com · tier other
- [Wind farms and wind energy benefits in the US](https://www.clearwayenergygroup.com/projects/wind-energy/) — clearwayenergygroup.com · tier other

## Data quality

- The $870 million consideration and approximately $1.6 billion of assumed non-recourse project financing applied to the 947 MW Alta portfolio, not to Alta Wind Energy Center I alone. The separate $1.2 billion construction financing involving approximately $580 million of pass-through certificates, a $499 million bridge facility, and $127 million of ancillary facilities was for Alta Projects II-V and is not attributed to Alta I. The current plant record remains one operational 150 MW unit; no distinct expansion, retirement, or repowering event is identified for EIA plant 57282 in the cited history.

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