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Metlakatla BESS

Technology Type Lead-acid Battery
Rated Power 1000 kW
Duration at Rated Power (HH:MM) 0:15.00 / 1.40
URL More about Metlakatla BESS
Metlakatla Power and Light (MP&L) has a BESS installation consisting of Exide (GNB Industrial Power) VRLA cells, providing rapid spinning reserve, frequency control, and better power quality. Beginning operation in 1997, the MP&L BESS has a 1 MW peak power output, and 1.4 MWh energy capacity. It is capable of supporting continuous loads of 800 kilovolt amperes (kVA), pulse loads up to 1200 kVA, and consists of 378 Absolyte VRLA 100A75 modules. Nearly 5 MW of hydroelectric generation capacity provides almost all of MP&L’s power, with a 3.3 MW diesel generation system relegated to reserve duty. MP&L’s two hydroelectric plants, Purple Lake and Chester Lake, have reservoir storage capacity, though the hydro generators were too slow to respond to sudden load fluctuations. At the time of the BESS’s initial operations, the MP&L peak load was approximately 4 MW. A lumber mill in Metlakatla (since closed down) caused large, sudden power spikes on the community’s islanded power system, and the BESS was installed to provide fast response for the mill’s rapid load changes. The MP&L BESS is housed in a purpose-built 40-foot by 70-foot steel butler building that sits on a cement pad. Installation cost of the 1 MW / 1.4 MWh Exide Metlakatla BESS was $1.6 million in 1996 dollars (estimated cost in 2009 dollars: $2.2 million). The battery system became operational in February 1997. It operated continuously for 11.5 years until September 2008, when the battery was replaced with a new VRLA product. The VRLA battery exceeded its 8-year design life by over 3 years. The BESS is estimated to have saved MP&L over $6.5 million over its life in reduced fuel consumption and maintenance, in addition to reduced greenhouse emissions. A new battery was installed with the support of the Alaska Commerce, Community, and Economic Development Agency, so the BESS will continue to provide benefits to the community for many years to come. Spent battery cells will be sent to a lead-acid battery recycling plant in Quebec.
This data has been validated by project staff through a review of publicly available information about the project, and verified by the project owner. Information is accurate as of 2016-04-29.
Project Status
Status Operational
Commissioning On 03.02.1997
Project Includes Multiple Systems No
Siting
Location

3.5 Mile Airport Rd.
Metlakatla, Alaska 99926
United States

ISO/RTO N/A
Utility Metlakatla Power & Light
Utility Type Cooperative (Customer Owned)
Paired Grid Resource Primary Distribution
Project Includes Multiple Systems No
Ownership & Value Chain Partners
Ownership Model Utility-Owned
Equity Owner 1 Metlakatla Light & Power
Equity Owner 1 Percent 100%
Energy Storage Technology Provider Exide
Cost & Performance
Performance The BESS is estimated to have saved MP&L over $6.5 million over its life in reduced fuel consumption and maintenance, in addition to reduced greenhouse emissions. Overall DC-AC electric efficiency: ~64%(incl. auxiliary and converter losses)
Capital Expenditure $2319978
Benefits
Service Use Case Electric Supply Reserve Capacity - Spinning
Frequency Regulation
Voltage Support
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