Read Nenana RivGenTM Power Project text version

Ocean Renewable Power Company Technology Overview

AEA Hydrokinetic Technical Conference April 12, 2010

Monty Worthington, Director of Project Development, Alaska

Ocean Renewable Power Company Overview

· Developer of technology and projects that convert river, tidal, and ocean currents into emission free electricity

· Founded in 2004 with executive offices in Portland, Maine and project offices in

· Anchorage, AK (ORPC Alaska, LLC) · Eastport, Maine (ORPC Maine, LLC)

· Proprietary technology including OCGenTM, TidGenTM, and RivGenTM power systems · Project sites in Cook Inlet and Nenana, AK, and Eastport, ME · Beta Turbine Generator Unit (TGU) deployed in March 2010


ORPC's Technolgy Development Philosophy

· Technology development and environmental considerations are intrinsically connected

· We include environmental considerations as part and parcel of the design process, and place equal weight on environmental effects, performance, cost and reliability. This informs the design of:

· · · · ADCF Turbines Generator Bottom Attachment System Power Transmission System


Hydrokinetic Energy

· Energy harnessed from moving water without the use of dams or impoundments


Tidal technologies

· 5 years ago ...


Tidal technologies

· Today!


Two Basic Turbine Variations ­ Axial Flow and Cross Flow Axial Flow

Cross Flow

New Energy's 5kW Encurrent Turbine

Marine Current Turbines 1.2 MW Sea Gen


ORPC Technology Evolution

Proprietary TGU is the core of three hydrokinetic power systems

TidGenTM Power System

Bottom mounted TGU for shallow tidal applications

Beta TGU OCGenTM Power System

Floating OCGenTM Modules (stacked TGUs) for deep tidal and offshore ocean current applications

RivGenTM Power System

Bottom mounted TGU for remote river applications


ORPC's ADCF (Advanced Design Cross Flow) Turbine

Developed by ORPC over the last 3 years and incorporates results of ORPC's year-long testing program for the prototype TGU completed in December 2008. Incorporates significant research, development and analysis done in conjunction with the UMaine, Maine Maritime Academy and UMass-Dartmouth. Three patent applications for the ADCF turbine have been filed. Key features: Helical foils adapted to varying turbine diameter ­ maximum diameter at mid-span Disks, rings and foils made with E-glass/vinyl ester laminate using vacuum infusion Carbon/E-glass hybrid primary shaft Intentionally removable foils (for ease of replacement) Built by US Windblade in Bath, ME

First all composite hydrokinetic turbine built in the U.S.

ORPC ADCF Turbine Specifications

ADCF Turbines have been chosen for ORPC's Technology development pathway for reliability, efficiency, and environmental considerations Key features: ADCF turbines spin at a modest 30-60 RPM comparable with most modern tidal technologies As ADCF turbines are of the cross flow design there is not a true "Tip" as an axial flow design. This means that Tip Speed Ratios (TSR's) are quite low compared to axial turbine designs at 1.4 ­ 1.8 This means that the fastest moving leading edge of the turbine foils moves at less than 10 knots in a 6 knot current ORPC ADCF turbines currently operate at around 20% efficiency, our turbine development process will Beta TGU Turbines and Generator increase this to over 30% efficiency

ORPC's Permanent Magnet Generator

ORPC's permanent magnet generator is designed to effectively convert the low RPM High torque energy from the ADCF turbines into useful electricity with a direct Drive Future iterations of ORPC technology will utilize a different the practically similar generator Key features: Generator does not require step up of Turbine RPMs to produce power eliminating the need for a gear box With No Gearbox efficiency and reliability are increased No Gearbox also means minimal lubricants are necessary, Approx 3 oz of bearing grease per TGU, reducing environmental risks from fluid spills The generator is waterproof and submersible with submarine power connections.

ORPC's Beta Permanent Magnet Generator Undergoing Testing at CPI

Power Transmission

The generator will produce 3 ­ phase AC power, currently at up to 600V but future iterations may utilize higher voltages. The electricity will be stepped up to 13.5kV DC Power through underwater power electronics This will be transmit to shore where the power will be conditioned at the shore station to grid compatible AC Power typical voltages will be 34.5kV 3 Phase AC Key features: Use of Medium Voltage Direct Current (MVDC) for Submarine Transmission will allow for reduced cable size and fewer conductors This will mean greater efficiency reduced cost, and reduced embedded energy in the power transmission infrastructure DC current has very low electrical fields associated with it, while magnetic fields (B fields) are somewhat stronger than similarly sized AC transmission lines. These B fields diminish rapidly from the cable, would be roughly 40 micro Teslas at the cable surface in a IMW cable, already below the background B-field of the earth and diminish to one tenth of that within a meter

ORPC's bottom attachment systems

ORPC will begin initial installations with gravity based foundations utilized in TidGenTM and RivGenTM systems. Larger Tidal and Ocean Current projects will de further developed with the compliantly moored OCGenTM system, currently under development. OCGenTM Power System

TidGenTM Power System

Bottom mounted TGU for shallow tidal applications Floating OCGenTM Modules (stacked TGUs) for deep tidal and offshore ocean current applications

RivGenTM Power System

Bottom mounted TGU for remote river applications


ORPC's Beta Turbine Generator Unit (TGU)

Weight: 13 tons

Design capacity: 60 kilowatts

Steel and composite TGU support frame Underwater Permanent Magnet Generator ADCF Turbine

14 feet tall

Visual Comparison ­ TGU & 6' Tall Human

The Energy Tide 2

Barge Facts: 60' long x 24' wide with 6' hull side Displacement capacity of 75 tons Built by Morrison Manufacturing (Perry, ME) Barge is leased from Eastport Port Authority Beta TGU deployed 21' below water (TGU center) Variable voltage, variable frequency electrical output converted into grid-compatible power Includes state-of-the-art environmental monitoring equipment (Didson, Simrad, etc.) System operations monitored using 4 underwater cameras (2 color, 2 black & white) Operational parameters monitored & data recorded Anchored in Cobscook Bay using a 4-legged single point mooring system


ORPC's Beta TGU and ET2


Energy Tide 2 at mooring

Beta TGU project monitoring

ORPC's is equipped with state of the art monitoring equipment to collect environmental and performance data for the project and to verify monitoring technologies and methodoliges for this purpose Data collection equipment: Technical data including power, RPM, vibration, strain gauges etc for turbine performance evaluation 2 color and 2 B/W video cameras for monitoring of turbine and aquatic species interactions 2 DIDSONs and 2 Simrads for monitoring of aquatic species interactions with turbine Hydro-acoustic survey of noise source levels of TGU ADV, and flow meters to collect current velocity data Thermal sensors to measure heat transfer to water

The ET2 control, data acquisition and monitoring room

Beta TGU tubine first rotations (free spinning approx 30 RPM)

DIDSON imagery of Beta TGU spinning

TidGenTM Device - a closer look

·TidgenTM TGU will be rated at 250kW in a 6 knot current ·TidGenTM TGU Will utilize (4) Beta sized turbines ­ 8.5 ft dia. X 18 ft long each ·TidGenTM TGU will be 90' x 14' and 30' above the seafloor ·TidGenTM Devices and Bottom frame will weigh approximately 60 tons and will be separately installed ·TidGenTM Device footprint will consist of (4) 6' diameter feet.


TidGenTM Device - specifications

250kW in 6kt current Voltage Output 480V RPM: 0 to 71 # Foils: 4 per side TSR: 1.4 Solidity: 29%


OCGenTM Module - a closer look

·OCGenTM Modules will be attached to the seafloor via a compliant mooring system with screw type, gravity based, or driven anchors. ·OCGenTM Modules will be comprised of 1 to4 TidGenTM Type TGU's each 90'x 14'. ·OCGenTM Modules will utilize 1/10th the weight and amount of materials for bottom attachment decreasing cost of the attachment system, and the imbedded energy ·OCGenTM Modules will minimize benthic disturbance with as little as (4) 2' diameter footprints per module


OCGenTM Module Specifications

1MW in 6kt current Voltage Output 480V RPM: 0 to 71 # Foils: 4 per side TSR: 1.4 Solidity: 29%


RivGenTM Power System- a closer look

·RivGenTM TGU will be rated at 30kW in a 6 knot current ·RivGenTM TGU is designed to fit into a standard 40x8'x10' CONEX container ·Power electronics will integrate RivGenTM Power System into isolated microgrids ·RivGenTM will be completely submerged allowing for potential year round operation, and eliminating viewshed issues


Thank you



w w w. o c e a n r e n e w a b l e p o w e r. c o m


Nenana RivGenTM Power Project

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