b'Information in this section should be updated yearly in tandem with the Idaho Governors Oce of Energy and Mineral Resources (OEMR)s Idaho Energy Landscape publication.https://oemr.idaho.gov/UTILITIESTwo investor-owned natural gas utilities, Avistadistributes natural gas to approximately 350,000 Utilities and Intermountain Gas Company, serve mostresidential, commercial, and industrial customers in of Idahos natural gas needs (see Figure 1). Dominion76 Idaho communities across 50,000 square miles Energy also services a portion of customers in Franklinin Southern Idaho through approximately 12,800 County located in southeastern Idaho. miles of pipeline. 50 percent of the annual energy throughput goes to 125 industrial and transport Avista Utilities customers, while residential and commercial Avista serves over 87,000 Idahoans, 90% beingcustomers comprise 33 percent and 17 percent residential customers, in its Washington/northernrespectively.5Idaho natural gas service area. Its North Division, which covers about 26,000 square miles primarily inIntermountain Gas holds rm capacity rights on eastern Washington and northern Idaho, is suppliedWilliams Northwest Pipeline in addition to three by more than 40 points along interstate pipelines.upstream pipelines to deliver gas to the distribution Avista holds rm access rights to both Canadian andsystem, which are: Gas Transmission Northwest, Rocky Mountain natural gas supplies through theFoothills Pipeline, and Nova Gas Transmission. IGC Williams Northwest and Gas Transmission Northwestowns and operates the Nampa LNG storage facility (GTN) pipelines.5 The Williams Northwest Pipelineand leases storage at the Jackson Prairie underground is a 4,000-mile bi-directional system that providesfacility, the Plymouth LNG facility, and leases capacity access to British Columbia, Alberta, Rocky Mountain,from Dominion Energys Clay Basin underground and San Juan Basin gas supplies.6 GTN is a 1,377-milestorage eld. Residential, commercial, and industrial interstate natural gas pipeline system that sourcespeak day load growth on IGCs system under design natural gas from the Western Canadian Sedimentaryconditions is expected to grow at an average annual Basin and Rocky Mountain region with a designrate of 2.08 percent over the ve-year period from capacity of 2,900 million cubic feet per day (MMcf/d).7 2019 to 2023.5Avista Utilities also holds rights to the Jackson Prairie and Plymouth storage facilities in Washington. TheirDominion Energycustomer base in Washington and Idaho is projectedDominion Energy, formerly called Questar Gas, is to increase at an average annual rate of 1.3 percent.5 based in Salt Lake City and provides natural gas Intermountain Gas Companyservice to residential, commercial, and industrial customers in Utah, southwestern Wyoming, and about Intermountain Gas Company (IGC) was founded2,200 customers in Franklin County, Idaho. The Idaho in Idaho in 1950 and became a wholly ownedPublic Utilities Commission has chosen to allow the subsidiary of MDU Resources Group in 2008, whichUtah Public Service Commission to regulate Dominion is headquartered in Bismarck, North Dakota. IGCEnergys activities in its small Idaho service area.5116 I D A H O I N F R A S T R U C T U R E G U I D E B O O K'