Intermountain Gas Company is the primary natural gas utility provider serving the southern region of Idaho. Headquartered in Boise, this subsidiary of MDU Resources Group, Inc. manages the distribution and transportation of natural gas across a vast service territory that includes approximately 75 communities. From residential heating in the Treasure Valley to powering large-scale industrial potato processing plants in Eastern Idaho, the company’s infrastructure is a cornerstone of the state's energy grid.

The company currently manages a massive network of over 10,000 miles of transmission and distribution pipelines. This system provides energy to more than 400,000 residential, commercial, and industrial customers. Understanding how this utility operates is essential for local residents managing their monthly expenses and for businesses relying on stable energy for production.

The Evolution of Natural Gas in the Snake River Plain

The history of Intermountain Gas Company is intertwined with the post-war growth of Idaho. Founded in 1950 by Nat and Myrtis Campbell, the company was born from a vision to bring cleaner, more efficient fuel to a region that was rapidly modernizing. While incorporated in 1950, it took five years of rigorous infrastructure planning and regulatory hurdles before the Idaho Public Utilities Commission (IPUC) granted certification in December 1955.

On December 31, 1955, the company officially connected its first five customers. Since that day, the company’s trajectory has mirrored Idaho’s population boom. What started as a small local venture has evolved into a sophisticated utility that joined the MDU Resources Group family in 2008. This acquisition provided the capital and corporate stability necessary to modernize a pipeline network that spans nearly 50,000 square miles, roughly covering the entire Snake River Basin.

The geographical challenges of southern Idaho cannot be overstated. The service area extends from the Oregon border in the west to the Wyoming border in the east. Laying pipe across the volcanic basalt and high-desert terrain of the Snake River Plain required engineering feats that remain the backbone of the region’s reliability today.

Navigating the Idaho Service Area and Regional Offices

Intermountain Gas Company does not operate from a single central hub; instead, it maintains a localized presence to ensure rapid response times and community engagement. While the corporate headquarters is located at 555 S. Cole Rd in Boise, the company operates several district and satellite offices across the state.

Key regional hubs include:

  • Boise and Nampa: Serving the densely populated Treasure Valley.
  • Twin Falls: Managing the agricultural heartland of Magic Valley.
  • Pocatello and Idaho Falls: Focusing on the industrial and residential corridors of Eastern Idaho.
  • Hailey: A smaller district office serving the Wood River Valley.
  • Satellite Offices: Strategic locations in Soda Springs, Burley, Mountain Home, and Payette ensure that even rural communities have access to service technicians.

This decentralized structure is vital for a utility where safety and service interruptions are time-sensitive. By having crews stationed in these various hubs, the company can monitor local pressure regulations and respond to "811" dig requests or emergency leak reports with greater efficiency.

Residential Services and the Level Pay Strategy

For the average homeowner in Idaho, the most pressing interaction with Intermountain Gas Company involves managing heating costs during the long, often brutal, high-desert winters. In our observation of Idaho’s energy landscape, the seasonal swing in gas usage is one of the most significant financial hurdles for families.

How Level Pay Dampens Seasonal Spikes

One of the most valuable programs offered is "Level Pay." For those unfamiliar with utility billing structures, Level Pay takes the total estimated annual cost of a household’s gas usage and divides it into 12 equal monthly payments.

In a standard billing cycle, a resident might pay $30 in July (using gas only for water heating) but see that bill skyrocket to $180 in January during a cold snap. Level Pay averages these extremes. In our experience, this is particularly helpful for residents on fixed incomes or those who prefer predictable monthly budgeting. The company periodically reviews the actual usage versus the estimated payments and adjusts the monthly amount to ensure the account remains balanced.

Energy Efficiency and Rebates

To mitigate the overall demand on the system, the company actively promotes energy efficiency. These programs are not just about environmental stewardship; they are practical financial incentives. Intermountain Gas offers cash rebates for:

  • Installing high-efficiency natural gas furnaces.
  • Upgrading to high-efficiency water heaters.
  • Implementing smart thermostats that optimize heating schedules.

For a new homeowner in Idaho, these rebates can offset a significant portion of the upfront cost of energy-efficient appliances. The company’s focus on "direct use" of natural gas—using gas directly for heating and cooking rather than using electricity generated by gas—is often cited in their Integrated Resource Plan as the most efficient way to utilize the fuel source.

The Industrial Powerhouse of Idaho

While residential customers make up the majority of individual accounts, the industrial sector is the largest consumer of gas by volume in Intermountain Gas Company's territory. In fact, large commercial and industrial clients often account for nearly half of the total "therm send-out" on the system.

The Potato and Food Processing Connection

Idaho is synonymous with potatoes, and the processing of those potatoes is incredibly energy-intensive. Large-scale processors in the Magic Valley and Eastern Idaho require massive amounts of natural gas for drying, blanching, and frying operations. These facilities are often "Firm Service" or "Interruptible Service" customers.

  • Firm Service: These customers pay a higher rate to ensure their gas supply is never cut off, even during peak winter demand.
  • Interruptible Service: These industrial users agree to have their gas supply curtailed during extreme weather events to ensure residential homes remain heated. In exchange, they receive significantly lower rates.

Chemicals, Fertilizers, and Semiconductors

Beyond agriculture, the company serves the chemical and fertilizer plants in the Soda Springs and Pocatello areas. These industries use natural gas not just for heat, but as a feedstock in chemical processes. In Boise, the burgeoning semiconductor and electronics industry also relies on a stable gas supply for high-precision manufacturing environments. This industrial diversity stabilizes Idaho's economy, providing jobs for over 40,000 residents across the state.

Safety Protocols and Emergency Management

Safety is the paramount concern for any natural gas distributor. Intermountain Gas Company invests heavily in pipeline integrity and public education. Because natural gas is naturally odorless, the company adds a chemical called mercaptan to give the gas its distinctive "rotten egg" smell.

What to Do If You Smell Gas

The company provides clear, non-negotiable instructions for gas emergencies:

  1. Evacuate Immediately: Do not stop to open windows or search for the source of the leak.
  2. Avoid Ignition Sources: Do not turn on lights, use a phone, or operate any electronic device inside the building. Even a small spark from a light switch can ignite a high concentration of gas.
  3. Call from a Distance: Once you are safely away from the premises, call the Intermountain Gas emergency line (800-548-3679) or 911.

The Importance of 811 (Call Before You Dig)

In a state like Idaho, where landscaping and home expansion are common, the "Call Before You Dig" initiative is a critical safety pillar. Whether you are planting a tree or installing a fence, Idaho law requires you to notify 811 at least two business days before digging. Intermountain Gas will send a locator to mark the underground gas lines with yellow paint or flags. Striking a gas line is not only a massive safety risk but can lead to significant financial liability for the property owner.

Decoding the 2025-2030 Integrated Resource Plan

Every two years, Intermountain Gas Company submits an Integrated Resource Plan (IRP) to the Idaho Public Utilities Commission. This document serves as a roadmap for the next 20 years, with a specific focus on the upcoming five-year window. The 2025-2030 IRP highlights several key trends that will shape Idaho’s energy future.

Demand Forecasting and "Degree Days"

The company uses a technical metric known as "Heating Degree Days" (HDD) to forecast demand. An HDD is a measurement designed to quantify the demand for energy needed to heat a building. It is the number of degrees that a day's average temperature is below 65 degrees Fahrenheit.

By analyzing decades of weather data, the company creates "Design Day" scenarios—the coldest possible day the system must be able to handle without failure. As Boise and the surrounding areas continue to grow, the IRP outlines the need for pipeline reinforcement and new compressor stations to maintain pressure during these Design Day events.

The Shift Toward Renewable Natural Gas (RNG)

A significant portion of the 2025-2030 plan is dedicated to the "Clean Energy Future." Intermountain Gas is increasingly looking at Renewable Natural Gas (RNG). RNG is methane captured from organic waste—specifically from Idaho's massive dairy industry and municipal landfills.

Instead of allowing methane to escape into the atmosphere, it is captured, cleaned, and injected into the existing pipeline infrastructure. This allows the company to lower its carbon intensity without requiring customers to replace their existing gas appliances. For Idaho, which has a surplus of agricultural waste, this is a "circular economy" solution that supports both the energy grid and the farming community.

Customer Service and Operational Hours

For residents needing to manage their accounts, the company offers several points of contact. Based on the latest business profiles, the standard customer service hours are:

  • Monday through Friday: 7:00 AM to 7:00 PM.
  • Emergency Services: Available 24 hours a day, 365 days a year.

Residents in the Treasure Valley can call the local line at 208-377-6840, while those in other parts of the state or outside the area should use the toll-free number 800-548-3679. The company has also modernized its digital interface, allowing for online bill pay, usage tracking, and paperless billing through their official website.

Why Idaho Relies on Natural Gas

The debate over energy sources often focuses on electricity, but in Idaho, natural gas plays a role that electricity currently cannot fully replicate, especially regarding "peak load." During a sub-zero winter night in the Snake River Plain, the amount of energy required to heat homes exceeds what the current electrical grid can deliver. Natural gas acts as a massive "battery" of stored energy, delivered through the pipes exactly when needed.

Furthermore, the "direct use" of gas for water heating and space heating is roughly 90% efficient from the source to the burner tip. In contrast, using electricity for heat—if that electricity is generated by a thermal power plant—can be significantly less efficient due to generation and transmission losses. This efficiency is why Intermountain Gas remains a central figure in the state's energy policy.

Summary of Key Features

Intermountain Gas Company remains a vital utility because it successfully balances historical infrastructure with forward-looking technology. Its role in Idaho can be summarized by three key pillars:

  1. Reliability: Managing 10,000 miles of pipe to ensure that even in -20°F weather, the heat stays on.
  2. Affordability: Through programs like Level Pay and energy efficiency rebates, they help residents manage the volatile costs of heating a home in a cold climate.
  3. Economic Foundation: By providing specialized services to the potato processing and chemical industries, they provide the literal energy that fuels Idaho's export economy.

Frequently Asked Questions

What areas does Intermountain Gas Company serve?

The company serves 74 to 75 communities throughout southern Idaho. This includes the major cities of Boise, Nampa, Caldwell, Twin Falls, Pocatello, and Idaho Falls, as well as rural areas along the Snake River Plain from the Oregon to Wyoming borders.

How do I report a gas leak?

If you smell a "rotten egg" odor or hear a hissing sound near a gas line, evacuate the area immediately. Do not use any phones or electronics inside. Once safe, call 800-548-3679 or 911. The emergency line is monitored 24/7.

What is the Intermountain Gas Level Pay program?

Level Pay is a billing option that averages your annual gas costs over 12 months. This prevents the high bill spikes typically seen in the winter, allowing for a consistent monthly payment throughout the year.

Is Intermountain Gas Company a public or private company?

Intermountain Gas is a private utility company. It is a wholly owned subsidiary of MDU Resources Group, Inc., which is a publicly traded company on the New York Stock Exchange (NYSE: MDU).

Does the company offer rebates for high-efficiency appliances?

Yes. Intermountain Gas provides rebates for residential customers who install high-efficiency natural gas furnaces, water heaters, and smart thermostats. Applications for these rebates can usually be found on their website.

How do I set up a new service with Intermountain Gas?

New customers can set up service by calling the customer service line (800-548-3679) during business hours (7 AM - 7 PM, Mon-Fri) or by visiting their website to submit a new service request. You will typically need to provide your address, personal identification, and potentially a deposit depending on your credit history.

What should I do before digging in my yard?

You must call 811 at least two business days before any excavation or digging. This is a free service where a professional will come to mark the location of underground natural gas lines to prevent accidental damage and ensure safety.