Idaho Public Utilities Commission

Case No. INT-G-10-04, Order No. 32074

November 11, 2010

Contact: Gene Fadness (208) 334-0339, 890-2712



Intermountain submits five-year plan


A five-year planning document by Intermountain Gas Company forecasts an annual increase of 1.75 percent in the company’s peak-day gas loads through 2015.


Intermountain anticipates it will not experience any peak-day delivery deficits during that time period, as long as some upgrades and adjustments made, particularly along the Idaho Falls and Sun Valley laterals. Peak days are those days – typically extremely cold days – is at peak demand.


The Idaho Public Utilities Commission is taking comments on Intermountain Gas’ Integrated Resource Plan (IRP) through Nov. 22. Regulated utilities are required to submit plans on how utilities plan to meet growth and customers are invited to review and comment on those plans. Intermountain Gas serves 305,000 residential, commercial and industrial customers throughout southern Idaho.


If the commission accepts the IRP, it does not mean that the projects in the plan are approved, but only that the company as met its long-range planning obligation.


Intermountain Gas does anticipate a peak-day deficit as soon as 2011 along its 104-mile Idaho Falls lateral but believes it can mitigate the deficit by switching some industrial customers to fuel oil during times of extremely cold temperatures. During 2009, 41.2 percent of the throughput on Intermountain’s system was attributable to industrial sales and transportation.


The Idaho Falls Lateral, which represents 15 percent of the company’s customers, serves a number of cities between Pocatello and St. Anthony. In addition to switching industrial customers to fuel oil, peak-day delivery deficits can be managed by bringing on gas from the new Rexburg Liquefied Natural Gas facility, the plan states.


The Sun Valley Lateral, which serves about 4 percent of Intermountain’s Idaho customers, will require a future upgrade to the existing pipeline system to meet growth in that area, the IRP states.  


In order to encourage conservation, Intermountain said it intends to continue its $200 rebate to customers who install a 90 percent greater efficiency natural gas furnace when converting to natural gas and a $30 rebate when a customer installs a .64 or greater energy factor gas water heater at the time of conversion.


Copies of Intermountain’s Integrated Resource Plan are available on the commission Web site at Click on the gas icon, then on “Open Gas Cases,” and scroll down to Case No. INT-G-10-04. Comments are accepted via e-mail by accessing the commission’s homepage and clicking on "Comments & Questions About a Case." Fill in the case number and enter your comments. Comments can also be mailed to P.O. Box 83720, Boise, ID 83720-0074 or faxed to (208) 334-3762.