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Verdant Power’s Roosevelt Island Tidal Energy (RITE) Project is located in the East Channel of the East River, a tidal strait connecting Long Island Sound with the Atlantic Ocean in New York Harbor.  Through the use of the Free Flow System, the project generates clean energy from the natural tidal currents of the East River.   


The RITE Project operates under a Hydrokinetic Pilot Project License from the Federal Energy Regulatory Commission (Project No. P-12611) and a Water Quality Certification from the New York State Department of Environmental Conservation, making it the first commercially-licensed tidal power project in

the United States. 

Gen5 System Installation

 On October 22, 2020, Verdant Power installed three Gen5 Free Flow System Turbines on a TriFrame™ mount at the RITE Project.

The installation will demonstrate the advanced Gen5 system and allow for analysis of the TriFrame™ as a cost-effective solution for the installation, operations, and maintenance of tidal energy systems. 


Funding support is being provided by the U.S. Department of Energy's Water Power Technologies Office and the New York State Energy Research & Development Authority (NYSERDA).   More >


RITE Project Overview

Advanced Technology
The Company has conducted in-water testing of the Free Flow System at the
RITE Project since 2002, advancing the system to the current fifth generation (Gen5).  During 2003-09, Verdant Power designed, built, and tested the Gen4 Free Flow System at the RITE Project, representing the world’s first operation of a grid-connected tidal turbine array and successfully demonstrating the technology as an efficient source of clean energy with the following outcomes:

  • Grid-connected power with no power quality problems

  • Fully bi-directional operation with high efficiency on both ebb and flood tides

  • Automatic control and continuous, unattended operation

  • No fouling or damage from debris

  • 9,000 turbine-hours of operation

Operational and environmental monitoring data gathered through this demonstration formed the basis for Verdant Power's application to FERC for its pilot license application, as well as advancement to the Gen5 system.  Further advancements and testing at RITE in 2012 advanced the composite rotor design.


Gen5 Rotor Test at RITE - 2012

Energy Generation at RITE

The East River is a tidal strait with strong water currents that change direction between flood and ebb tides approximately four times each day (with periods of little or no flow between tides, called “slack tide”).  As shown in the figure below, when the water velocity exceeds approximately 1.0 m/s (3.3 ft/s or 2 knots), the turbine blades begin to rotate and the units generate electricity for approximately 4.5 hours (red areas in figure).  As the tide shifts direction, the turbines yaw (turn approximately 170 degrees) to generate power from the current flowing in the opposite direction. This cycle repeats in a very predictable manner approximately every 6 hours.  The regular nature of tidal currents provides a significant advantage for tidal power as compared to other, less predictable resources like wind and solar power.

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