The Alaska Intertie transmission line is a 170-mile long,
345kV transmission line between Willow and Healy that is owned by AEA and
operates at 138 kV. The Intertie interconnects Golden Valley Electric
Association (GVEA), the regulated utility that serves areas north of the Alaska
Range, with southcentral Alaska utilities. As an integral part of the
interconnected Bulk Electrical System (BES) for the railbelt region, this AEA
owned asset transmits Bradley Lake and economy power north into the GVEA
system. The economy power is generated by Chugach Electric Association (CEA),
Matanuska Electric Association (MEA), and Municipal Light and Power (ML&P).
Although power generally flows north, the line is also available for GVEA to
transfer energy south if an emergency situation finds the Cook Inlet region
short of electric power.
Constructed in the
mid-1980s with $124 million in State of Alaska appropriations, there is no debt
associated with this transmission line. The Alaska Intertie consists of
transmission towers and conductors, transformers at the Healy, Teeland, and
Douglas Substations, and system stability devices at three locations that are
necessary to allow the Railbelt utilities to remain interconnected.
There are significant cost savings resulting from the
exchange of economy energy and sharing of reserve generation capacity between
the Anchorage and Fairbanks load centers. GVEA ratepayers achieved savings in
excess of $70 million in annual benefit. The average annual savings over the
past 15 years is in excess of $40.
For an up-to-date snapshot of the Alaska Intertie, please see our downloadable Factsheet.