The combined Viridon and Blackstone team has spearheaded the development, construction, and operation of a $20 billion portfolio of transmission projects to integrate 18,000 MW of renewable energy.
Current Projects
Viridon and Blackstone are investing in major new transmission projects to integrate renewable energy while strengthening the grid.
Location: New York (NYISO region)
Details: 100-mile, ±320kV High Voltage Direct Current (HVDC) transmission lines, converter stations, and 345kV interconnection cables
Background: This project is currently under development by Viridon New York and planned for completion in 2033. It is one of several being considered by the state to achieve New York’s ambitious clean energy goals. The project will interconnect with future offshore wind projects and deliver their energy to the Downstate grid via submarine cables, enabling the controlled delivery of 5,600 MW of local renewable power into the New York Metro area.
Location: New York (NYISO region)
Details: 339-mile, ±400kV High Voltage Direct Current (HVDC) transmission line and converter station
Background: This project is currently under construction and scheduled for completion in 2026. It is owned and managed, and was originated and developed, by Transmission Developers Inc., a fellow Blackstone portfolio company. The project will extend underwater and underground from Quebec to New York City, enabling the controlled delivery of 1,250 MW of low-cost renewable power into the New York Metro area, while making substantial investments in environmental protection programs and other community initiatives.
prior Projects
The Viridon team has a long track record of delivering mission-critical transmission projects across North America.
East West Tie Line
Ontario, Canada (IESO region)
280-mile, double-circuit 230kV transmission line
Completed in 2022, this project enabled the replacement of inefficient generation in Northwestern Ontario with cleaner and cheaper sources of power while enhancing reliability. The project consortium included both a Canadian energy company and pension fund, together with First Nation communities along the route, and involved extensive environmental consultation. Viridon team members led the initial development and provided oversight and support at all stages of the project.
Completed in 2022, this project enabled the replacement of inefficient generation in Northwestern Ontario with cleaner and cheaper sources of power while enhancing reliability. The project consortium included both a Canadian energy company and pension fund, together with First Nation communities along the route, and involved extensive environmental consultation. Viridon team members led the initial development and provided oversight and support at all stages of the project.
Lone Star Transmission
Texas (ERCOT) region
330-mile, 345kV double-circuit transmission line and 7 substations
Completed in 2013 as part of a statewide buildout of the high voltage grid to accommodate the integration of 10,000 MW of wind energy. Viridon team members provided oversight and support at all stages of the project, from permitting through to financing, construction, and operations.
Completed in 2013 as part of a statewide buildout of the high voltage grid to accommodate the integration of 10,000 MW of wind energy. Viridon team members provided oversight and support at all stages of the project, from permitting through to financing, construction, and operations.
Empire State Line
New York (NYSIO region)
20-mile, single-circuit 345kV transmission line with two 345kV switchyards and a Phase Angle Regulator (PAR)
Completed in 2022, this project unlocked 3,700 MW of renewable energy from Niagara Falls and Canada for delivery throughout New York. Originally selected by NYISO in 2017 as the first competitive project in New York awarded pursuant to FERC Order 1000. Viridon team members provided oversight and support at all stages of the project.
Completed in 2022, this project unlocked 3,700 MW of renewable energy from Niagara Falls and Canada for delivery throughout New York. Originally selected by NYISO in 2017 as the first competitive project in New York awarded pursuant to FERC Order 1000. Viridon team members provided oversight and support at all stages of the project.
Suncrest SVC
California (CAISO region)
230kV 300 MVar Static VAR Compensation (SVC) station
Completed in 2020, this project supports the grid in and around San Diego by injecting or absorbing reactive power to maintain voltage levels, which helps integrate renewable energy. Originally selected by CAISO in 2015 as the first competitive project in California awarded to a non-incumbent utility pursuant to FERC Order 1000. Viridon team members provided oversight and support at all stages of the project.
Completed in 2020, this project supports the grid in and around San Diego by injecting or absorbing reactive power to maintain voltage levels, which helps integrate renewable energy. Originally selected by CAISO in 2015 as the first competitive project in California awarded to a non-incumbent utility pursuant to FERC Order 1000. Viridon team members provided oversight and support at all stages of the project.
Gridliance West
Nevada (CAISO region)
53-mile, ±200kV High Voltage Direct Current (HVDC) transmission line and two converter stations
Completed in 2010, this first-of-its-kind submarine project can deliver 400 MW from the East Bay to San Francisco, meeting 40% of the city’s peak electrical power needs while reducing energy costs and environmental impacts for California customers. Viridon team members led the acquisition of the project in 2019 and provided oversight and support to the ongoing operations, maintenance, and management of the project.
Completed in 2010, this first-of-its-kind submarine project can deliver 400 MW from the East Bay to San Francisco, meeting 40% of the city’s peak electrical power needs while reducing energy costs and environmental impacts for California customers. Viridon team members led the acquisition of the project in 2019 and provided oversight and support to the ongoing operations, maintenance, and management of the project.
Trans Bay Cable
California (CAISO region)
53-mile, ±200kV High Voltage Direct Current (HVDC) transmission line and two converter stations
Completed in 2010, this first-of-its-kind submarine project can deliver 400 MW from the East Bay to San Francisco, meeting 40% of the city’s peak electrical power needs while reducing energy costs and environmental impacts for California customers. Viridon team members led the acquisition of the project in 2019 and provided oversight and support to the ongoing operations, maintenance, and management of the project.
Completed in 2010, this first-of-its-kind submarine project can deliver 400 MW from the East Bay to San Francisco, meeting 40% of the city’s peak electrical power needs while reducing energy costs and environmental impacts for California customers. Viridon team members led the acquisition of the project in 2019 and provided oversight and support to the ongoing operations, maintenance, and management of the project.
REGIONS SERVED
Our business is organized into six regional transmission companies, each one dedicated to serving the needs of a transmission system operator.
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