Idaho Power plans to phase out most of its coal-fired generation,
partly because its plants are running less often amid persistently
low natural gas prices, according to the integrated resource plan
the utility filed with state regulators prior to the holiday
weekend.
"Because of the low natural gas prices and expanded renewable
generating capacity, wholesale electric market prices over recent
years have frequently been too low to merit economic dispatch of
coal generating capacity," the Boise, Idaho-based utility said in
the 20-year IRP it filed Friday with the Idaho Public Utilities
Commission.
Instead of installing selective catalytic reduction equipment on Jim
Bridger units 1 and 2, which total 1,060 MW, Idaho Power expects to
retire them ahead of schedule -- in 2032 and 2028, respectively.
Idaho Power plans to negotiate with PacifiCorp and state regulators
over retiring the units. Idaho Power owns one-third of the Jim
Bridger plant and PacifiCorp owns the remainder of the facility.
"The challenging economics posed by low wholesale electric market
prices, particularly when coupled with the need for capital
investments for environmental retrofits, have increasingly led
owners of coal-fired power plants to evaluate the cost-effectiveness
of continued capital expenditure and continued operation," the IRP
said.
SCRs have already been installed on Jim Bridger units 3 and 4, which
total 1,060 MW. Idaho Power expects the units to operate at least
through 2036, according to the IRP.
Idaho Power has a 10% stake in the 640-MW coal-fired Boardman power
plant that is set to be retired at the end of 2020.
The utility is also negotiating the early closure of the 568-MW
coal-fired North Valmy plant in northern Nevada with co-owner NV
Energy. Idaho Power aims to close one unit in 2019 and the other in
2025.
The utility intends to replace capacity from the plant by
periodically importing capacity from Nevada, according to the IRP.
"Idaho Power has expressed the objective to transition away from
reliance on coal-fired generating capacity, provided this transition
can be conducted in a responsible, economically beneficial and
measured manner," the IRP said.
Last year, Idaho Power got 24% of its electricity from coal-fired
generation, 39% from hydroelectric facilities, 27% from purchased
power and 10% from natural gas and diesel generation, according to
the resource plan.
About one-third of the purchased
power
came from wholesale markets and the rest was bought under Public
Utility Regulatory Policies Act contracts with renewable and
co-generation facilities.
Idaho Power's hydro assets total 1,709 MW, while PURPA contracts
with operating facilities total 1,115 MW. About half of the PURPA
contracts are with wind farms and one-quarter with solar facilities.
Meanwhile, Idaho Power expects its load to grow 0.9% a year and its
peak demand to increase by 1.4%/year, down from its 1.2% and 1.5%
growth forecast included in its 2015 IRP.
--Ethan Howland,
newsdesk@spglobal.com
--Edited by Valarie Jackson,
valarie.jackson@spglobal.com
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