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Southeast Alaska Power Agency. NWHA 2014 Annual Conference – Seattle, WA Trey Acteson, CEO.

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Southeast Alaska Power Agency

NWHA 2014 Annual Conference – Seattle, WA

Trey Acteson, CEO

SEAPA’s Mission: To provide the lowest wholesale power rate consistent with sound utility planning and business practices. We exist for the long-term benefit of our member utilities and the rate payers, providing unified regional leadership for project development and prudent management of our interconnected power system.


Southeast alaska
Southeast Alaska

  • Regional Profile:

  • Extends 500 miles Metlakatla to Yakutat

  • 35,000 sq. miles

  • Land ownership dominated by Fed 95%

  • Mostly Inventoried Roadless

  • 18,500 miles of shoreline

  • 34 Communities

  • 28 < 1000 people

  • 12 < 100 people

  • S.E. Population 75,000

  • 33k Juneau

  • 20k SEAPA Interconnected Region

  • 9k Sitka


Who is SEAPA?

Southeast Alaska Power Agency

  • Regional Generation & Transmission Joint Action Agency

  • SEAPA owns the Tyee and Swan Lake Hydroelectric Projects, providing wholesale power and energy to the Municipalities of Ketchikan, Wrangell and Petersburg

  • SEAPA owns the transmission lines linking those communities together – Approximately 175 miles of transmission, including 14 miles of submarine cable

  • Evolved from the Four Dam Power Pool

  • SEAPA’s hydro projects were originally built by the State in early 1980’s and later purchased

  • Provide bundled services (Scheduling, Planning, Engineering, O&M, Water Mgmt., etc.)

  • Facilitate regional project development


SEAPA Control Area

Petersburg

20112012

MetersLoad/MWh

PSG- 2112 55,404

WRG- 1979 38,509

KTN- 7443181,932

Totals: 11,534 275,845 MWh

PSG

Wrangell

Tyee

Note: Only 12,000 meters to spread cost of new development

WRG

KTN

Swan

SEAPA Generation

Swan Lake

Tyee Lake

25 MVA

77,000 MWh

25 MVA

130,000 MWh

Ketchikan


Regional hydrosite evaluation
Regional Hydrosite Evaluation

Purpose: Enhance S. E. Alaska Integrated Resource Plan (SEIRP)

  • Catalog potential hydropower sites

  • Establish desired data set for evaluation

  • Conduct field studies to fill SEIRP gaps

  • Raise base level of knowledge

  • Create ranking criteria/methodology

  • Establish regional database for decision makers


Hydrosite evaluation focus area
Hydrosite Evaluation – Focus Area


Challenges
Challenges

  • Over 60 unique sites

  • Limited funding 1.7 million

  • Remote logistics

  • Weather

  • Safety

  • Balancing confidentiality with mission


Project approach
Project Approach

Step 1 - Select project manager (MCM)

Step 2 – Define overall objectives (Calibration)

  • Review Preliminary Assessment (SEIRP)

  • Perform Gap Analysis

    Step 3 – Project definition

  • Data collection objectives

    Step 4 – Reconnaissance

    Step 5 – Analysis & Recommendations


Status
Status

Inspection criteria defined

Project library structure created

Gap analysis of SEIRP

Reconnaissance plan developed

Field team deployed to Annette Island in 2013 to evaluate energy and capacity content capabilities of entire island

  • Basin hydrology assessment (inflow prediction)

  • Flood estimation using USGS regression analysis

  • Stream gauge installation at two sites

  • Intake/Impoundment surveys

  • Bathymetric survey (depth) and side band LIDAR (storage) assessment


Process refinement
Process Refinement

  • Best to deploy hydro guru on initial recon

  • Cluster “like” sites to minimize costs

  • Cleary define objective for each site

  • Clearly define technical teams and equipment

  • Explore lower-tech data collection options

  • Ensure adequate redundancy

  • Expect delays – Be flexible


Photo tour
Photo Tour

  • Blue Lake – Sitka

  • Whitman Lake – Ketchikan

  • Swan Lake – Near Ketchikan


Blue lake sitka
Blue Lake - Sitka

Raise dam 83’

New Powerhouse (3) 5.7MW turbines

New 1 MW Fish Valve Unit

Decommission (4) turbine generators

New intake structure and gate house

New surge chamber

Penstock and tunnel upgrades

Additional 34,500 MWH firm energy (27%)

Cost: $142M + 15M Diesel Project



Whitman lake ketchikan kpu
Whitman Lake – Ketchikan (KPU)

Dam constructed in 1927

2 - 42” penstocks

4.6 MW output

Supplies hatchery


SEAPA’s Swan Lake Dam

174’ High & 430’ long at crest. Reservoir capacity 86,000 acre-feet.


Swan Lake Reservoir Expansion Project

  • Cost: $13,391,869

  • BENEFITS:

  • Displaces up to 800,000 gallons of diesel annually ($2.75 million)

  • Adds 25% more active storage

  • Maximizes use of existing infrastructure

  • Shifts spill to winter generation

  • Compliments other projects

  • Adds operational flexibility

  • Timed with load growth


Swan lake status
Swan Lake Status

  • FERC Board of Consultants assembled

  • 30% Design Firm under contract

  • Non-capacity license amendment to be filed in April 2014

  • Actively pursuing State grant funding

  • Construction 2015/16



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