Title: AP&T began studying the feasibility of low-head' hydr
1Eagle Hydrokinetic Turbine Project
- Alaska Tidal Energy Conference
- January 2007
- Presentation by
- Alaska Power Telephone
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3Eagle Hydrokinetic Turbine Project
- Project Overview
- Hydrokinetic Turbine Project Timeline
- APT began studying the feasibility of low-head
hydro generation in the late 90s - Collaborating with UEK Corp. APT decided to
proceed with developing plans for installing a
small hydrokinetic station in Eagle - Today we are ready to proceed with formal
engineering and design activities and move
forward with the project - The four year project will determine the
viability of the turbine and associated
technologies for operation in rural arctic Alaska
- Short Term engineering construction - first
year - Mid Term - operation and monitoring - 3 yrs
following commissioning - Long Term - after completion of the project and
into the future
4Eagle Hydrokinetic Turbine Project
- Project Overview
- Short Term Goals for the Hydrokinetic Turbine
Project - Perform surveys of the project site
- River - profiling, velocity, ice
- Soils - boring,
- Determine turbine location
- Determine construction methods
- Purchase or lease land for onshore facilities
- Complete engineering design
- Proceed with manufacturing
- Proceed with construction and installation
- Commission
5Eagle Hydrokinetic Turbine Project
- Project Overview
- Three Year Goals for the Hydrokinetic Turbine
Project - Operate
- Test and monitor
- Determine the reliability in arctic conditions
- Determine best practices for deployment,
operation and maintenance - Determine environmental impact
- Determine performance
- Determine OM costs
6Eagle Hydrokinetic Turbine Project
- Project Overview
- Long Term Goals for the Hydrokinetic Turbine
Generator - Installation of second turbine generator unit in
Eagle - Output from two units would replace diesel
generation - Diesels would be maintained for standby and
emergency use - Reduction in rates to the consumers
- Reduction in emissions and associated
environmental impacts - Increase the sustainability for the rural Alaska
communities - Possible installation of similar units in other
locations
7Eagle Hydrokinetic Turbine Project
- Project Overview
- City of Eagle
- Located on the north terminus of the Taylor
Highway - About 6 miles west of the Alaska-Canada border
- Due east of Fairbanks about 190 miles
- At about 64.79 north latitude and -141.20 west
longitude - At about 850 feet above sea level
- Eagle Village is located about 3 miles upriver
from the City of Eagle - Transportation into Eagle
- State owned airstrip with commercial flights from
Fairbanks - Float plane, during the summer months only
- River boat, operating in the summer months only
- Taylor Highway, open in the summer months only
8Eagle Hydrokinetic Turbine Project
9Eagle Hydrokinetic Turbine Project
Eagle at the End of Summer (Viewed from Belle
Island)
10Eagle Hydrokinetic Turbine Project
Eagle in the Winter (Viewed from River)
11Eagle Hydrokinetic Turbine Project
- Project Overview
- Brief History of the City of Eagle
- The area is the historical home of the Han
Kutchin Indians - The original settlement was established in 1874
as a trading station supplying miners working the
upper Yukon - The City of Eagle was founded in 1897
- Population of over 1700 by 1898
- US Army Fort Egbert established in 1900
- First incorporated city in the interior 1901
- Telegraph service from Eagle to Valdez in 1903
- Population declined to lt200 by 1910
- Fort Egbert abandoned in 1911
12Eagle Hydrokinetic Turbine Project
- Project Overview
- Eagle Today
- Population in Eagle is about 140 and in Eagle
Village about 80 - Subsistence activities are part of the lifestyle
- Local economy includes
- Retail businesses, seasonal
- School
- Utilities
- Mining
- Tourism, seasonal
- River boat trip from Eagle to Dawson
- Lodging and restaurants
13Eagle Hydrokinetic Turbine Project
- Project Overview
- Electricity Generation in Eagle Today
- APT serves about 190 customers in the two
communities providing electricity and
communication services - The electrical system is isolated
- Powerhouse located in Eagle
- Load varies daily according to the season from a
summer low of 70kW to a winter high of 150kW - The prime movers for the existing generators are
diesel engines - Annual fuel consumption is about 57,000 gallons
- Engine life is 3 - 4 years (25,000 hours)
- Annual generation maintenance costs about 40,000
(w/o labor)
14Eagle Hydrokinetic Turbine Project
- APT Generation Goals
- Renewable Energy
- APT has for the for last two decades sought
technologies to augment their diesel generation
with renewable energy resources - Today APT supplies its customers with about 70
of the generation from renewable energy resources - In the southeast APT has designed, built and put
into service several hydroelectric power stations
- For the companies interior utilities conventional
hydroelectric facilities are not practical as
such the application of other renewable energy
resources is being studied including - Hydrokinetic turbine generation
- Wind turbine generation
15Eagle Hydrokinetic Turbine Project
- Hydrokinetic Opportunity
- Yukon River at Eagle
- Eagle is located on the west bank of the Yukon
River - The river divides at Eagle around Belle Island
- The hydrokinetic turbine will be located just
beyond the entrance to the west channel - Turbine location will be optimized for depth and
water velocity
16Eagle Hydrokinetic Turbine Project
17Eagle Hydrokinetic Turbine Project
- Hydrokinetic Opportunity
- Yukon River at Eagle
- The channel width in this area varies seasonally
between 900 and 1,000 feet - Channel maximum depth in the winter is about 18
feet including 4 feet of ice - The river water level changes 10 to 12 feet
between winter and summer - Water temperature varies from just above freezing
to about 60F - Water visibility varies from several feet in the
winter to near zero in the summer - Water velocity in the winter is about 7.3 ft/sec
18Eagle Hydrokinetic Turbine Project
- Hydrokinetic Opportunity
- Yukon River at Eagle Ice
- River normally begins to freeze in October
- River surface is frozen solid with ice normally
about 4 feet thick - Ice thickness can reach up to 8 feet
- Thinner ice in the area of the moving water
- Frazil ice under the solid ice, thickness of
frazil layer unknown - Ice break-up normally occurs in April and the
river is clear by May - Ice break-up can be destructive with ice flow
scouring the river bottom and edges removing
several feet of earth
19Eagle Hydrokinetic Turbine Project
Yukon River Winter Time (Belle Island in the
Distance)
20Eagle Hydrokinetic Turbine Project
Ice Jamb Viewing Upstream from Eagle
21Eagle Hydrokinetic Turbine Project
Ice Jamb Viewing Downstream from Eagle
22Eagle Hydrokinetic Turbine Project
- Project Overview
- Major Project Features
- Turbine
- Converter Station
- Directional Bore
- Cable
- Anchorage
- Turbine Deployment Recovery
23Eagle Hydrokinetic Turbine Project
24Eagle Hydrokinetic Turbine Project
- Turbine
- UEK Corporation
- Design and manufacturing performed since 1981 in
Annapolis, Maryland USA - Builders of river and tidal current turbines
featuring ducted design enhanced with a flared
discharge (Augmentor Ring) - Current Activities
- Turbine model testing at LEcole Polytechnic
Federal de Lausanne (EPFL) laboratory in
Switzerland - Turbine demonstration project in the Winnipeg
River in collaboration with the University of
Manitoba and Hydro Manitoba - Turbine supply for the Chitokoloki Mission
Hospital in Zambia, Africa to replace diesel
generation unit similar to Eagle turbine -
installed in the Zambezi River delivery end of
2007
25Eagle Hydrokinetic Turbine Project
- Turbine
- Eagle Specifications
- 8 foot diameter UEK System twin-rotor design
- 100kW with a 5 knot flow
- Counter-rotating turbine runners
- Turbine assembly integrated into reinforced skid
with flotation tanks to raise and lower the unit
in the river - Turbine protected with heavy duty ice deflecting
cage - 3Ø, AC generator with DC output from integrated
rectifier - DC connection to shore station
- DC-AC conversion at shore station
26Eagle Hydrokinetic Turbine Project
UEK System View of Intake
27Eagle Hydrokinetic Turbine Project
UEK System View of Discharge
28Eagle Hydrokinetic Turbine Project
UEK System Section View
29Eagle Hydrokinetic Turbine Project
30Eagle Hydrokinetic Turbine Project
- Turbine Installation Views
31Eagle Hydrokinetic Turbine Project
- Turbine Anchoring Details
32Eagle Hydrokinetic Turbine Project
- Turbine Directional Boring Details
33Eagle Hydrokinetic Turbine Project
- Converter Station
- Utility Interconnection
- Shore based facility located on land leased from
the city - Station will be housed in a modified container
equipped with - AC-DC variable speed converters similar to
Magnetek Type PCS - 50 kW stackable modules
- 600 750 VDC input x 480 VAC, 3Ø, 60 Hz output
- Main switchgear with generator and feeder circuit
breakers - Monitoring and control equipment
- Communication equipment
- Station service equipment
- Air compressor for pumping air to turbine floats
- Nitrogen gas system for pressurizing the
generator housing - Step-up transformer and isolating switches for
connection to utility power grid at 7,200 VAC
(outdoor pole mounted)
34Eagle Hydrokinetic Turbine Project
- Directional Bore
- Cable Connection to Generator
- One bore sized for future additional turbine set
or two bores - Option I
- Bore from converter station to turbine anchorage
- Approximately 800 feet long
- Deep penetration from station elevation to below
river almost 110 feet - Most expensive
- Option II
- Bore from intermediate location at elevation
nearer the river surface - Shorter and shallower
- Longer overall cable distance
- Requires additional cable junction facility and
trenching or overheading to converter station - Modifiers
- Location of turbine in river, distance from shore
35Eagle Hydrokinetic Turbine Project
36Eagle Hydrokinetic Turbine Project
- Cable
- Cable Assembly
- Cable length from 1,000 to 1,500 feet long
- For the project the cable will be a loomed
assembly of - DC power cable
- Monitoring cable, multi-conductor and/or fiber
optic - Nitrogen gas hose
- Air hose
- Insulated and armored electrical/ fiber optic
conductors - Factory integrated cable possible for future
projects - Watertight submersion rated connectors at turbine
- Clamped to anchor cable for support
37Eagle Hydrokinetic Turbine Project
- Anchorage
- Turbine Anchors
- Single or multiple anchors for each turbine
- Located 180 to 200 feet upstream of turbine
- Anchor types being considered
- Deadweight type, concrete/steel
- Micropiles, bored and grouted
- Multiple galvanized steel anchor cables
38Eagle Hydrokinetic Turbine Project
- Deployment and Recovery
- Turbine Installation Removal
- Turbine launched from public boat ramp 2,500
feet upstream - Winch cable released under brake until turbine
reaches anchor float - Turbine guided into position by small powered
boat - Turbine attached to anchor cable and released
from winch cable - Cable and hoses connected
- Air released from float tanks to allow turbine to
sink to bottom - Removal performed with the opposite process
- Normal maintenance will include visual inspection
and debris removal requiring only that the
turbine be raised to the surface - Annual maintenance will require that the turbine
be removed
39Eagle Hydrokinetic Turbine Project
40Eagle Hydrokinetic Turbine Project
- Permitting and Regulatory Requirements
- Permitting Agencies
- US Army Corps of Engineers
- Moorage Permit
- State of Alaska Department of Natural Resources
- Office of Habitat Management and Permitting
- Fish Habitat Permit
- Division of Mining, Land and Water
- Private Non-Exclusive Right-of-Way Permit
41Eagle Hydrokinetic Turbine Project
- Permitting and Regulatory Requirements
- Reviewing Agencies
- US Department of Fish Wildlife Service
- Alaska Department of Fish and Game
- National Marine Fisheries Service
- Other jurisdictional local, state, and federal
agencies
42Eagle Hydrokinetic Turbine Project
- Permitting and Regulatory Requirements
- Moorage Permit Requirements
- Moored facility submerged approximately 20 below
the surface of the river. - Historic and archeological remains -
archeological monitor onsite. - Navigable waters marking buoy and signals
- Approval of US Fish and Wildlife Service and
Alaska Department of Fish And Game - Monitoring Plan
- Possible fish injury from turbine operation
- Pressure changes caused by blade action
- Heat generation of unit and possible changes in
surrounding water temperatures - Physical, biological, and behavioral impacts to
different sizes of fish
43Eagle Hydrokinetic Turbine Project
- Permitting and Regulatory Requirements
- Moorage Permit Requirements, cont.
- Initial testing timed to avoid upstream migration
of adult fish and downstream smolt migration. - Inclusion of mitigation measures such as screens
or flutterboards, restrictions on operating
times, and blade speed limits if required. - Onshore facilities shall have minimal impact to
riparian vegetation.
44Eagle Hydrokinetic Turbine Project
- Permitting and Regulatory Requirements
- Fish Habitat Permit Requirements
- Construction and installation plan submittal and
approval - Turbine pressure drop test results and possible
field testing to confirm that pressure drop
across turbine is lt2.7 psi. - Underwater monitoring plan to videographically
document - Avoidance behavior of upstream migrant salmon
- Presence or absence of main stem Chinook salmon
spawning redds
45Eagle Hydrokinetic Turbine Project
- Permitting and Regulatory Requirements
- Right-of-Way Permit Requirements
- General construction requirements
- Conduct studies to determine effect of the
turbine on salmon as requested by the National
Marine Fisheries Service.
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