How to Read Your Gas Bill: Every Charge Explained

Your natural gas bill arrives once a month and most people pay it without ever understanding what the charges actually mean. If you’ve ever wondered what “distribution charge,” “gas commodity cost,” or “customer charge” actually are — this guide explains every line on your bill in plain English.

Table of Contents

• What Is a Therm?
• The Main Charges on Your Gas Bill
• Variable Charges That Change Monthly
• How Gas Prices Are Set
• Why Your Gas Bill Is Higher in Winter
• How to Lower Your Gas Bill
• Frequently Asked Questions

What Is a Therm?

Before understanding your bill, you need to understand the unit being measured.

A therm is a unit of heat energy equal to 100,000 British Thermal Units (BTUs). Your gas meter measures actual gas volume in cubic feet, then your utility converts that to therms based on the heat content of the gas.

The conversion is approximately: 1 therm ≈ 100 cubic feet (CCF) of natural gas

Why therms? Because natural gas isn’t 100% methane everywhere — it has slightly different heat content depending on its source. Billing in therms ensures you’re paying for the actual heat energy you use, not just the volume.

Typical therm costs in the US (2026):

• National average: approximately $0.95–$1.50 per therm
• High-cost states (CA, NY, NE): $1.50–$2.50 per therm
• Low-cost states (TX, OK, KS): $0.70–$1.10 per therm

The Main Charges on Your Gas Bill

1. Customer Charge (Monthly Service Charge)

This is a fixed flat fee charged every month regardless of how much gas you use. Think of it as the utility’s cost to maintain your connection, read your meter, send your bill, and provide customer service.

Typical range: $10–$25 per month

This charge doesn’t change if you use more or less gas. Even if you use zero therms in a given month, you’ll still pay the customer charge.

2. Gas Commodity Charge (Gas Cost / Supply Charge)

This is the actual cost of the natural gas molecules you burned. The commodity charge is multiplied by the number of therms you used.

Example: If your commodity rate is $0.60/therm and you used 50 therms, your commodity charge is $30.

The commodity rate can change monthly — it tracks wholesale natural gas prices on the market, which fluctuate based on weather, production, storage levels, and global demand.

3. Distribution Charge (Delivery Charge)

This is the largest charge for most residential customers. It pays for the pipeline network that delivers gas from the regional grid to your home — the thousands of miles of pipes, compressor stations, and local distribution infrastructure your utility maintains.

Typical structure: A fixed customer portion plus a variable per-therm rate

Example: $0.30/therm distribution rate × 50 therms = $15 distribution charge

This charge is regulated by your state utility commission and doesn’t change with the commodity market. It’s set through rate cases decided by the Public Utilities Commission (PUC) in your state.

4. Transmission Charge (Pipeline Transportation)

Some utilities separate the interstate pipeline transmission cost from local distribution. This covers moving gas from production regions (Gulf Coast, Permian Basin, Appalachian Basin) to your state’s local utility.

Not all bills show this as a separate line — some utilities bundle transmission into the commodity or distribution charge.

5. Taxes and Regulatory Fees

Most bills include:

• State and local sales tax on the gas charges
• Utility users tax in some municipalities (common in California)
• Franchise fee — the fee your utility pays the city for operating in its territory, passed through to customers
• Pipeline safety fee — a small state-level charge for pipeline safety regulation

These are usually 5–15% of your total pre-tax bill.

Variable Charges That Change Monthly

Beyond the core structure, some bills include additional line items:

Low-Income Assistance Surcharge

Many utilities add a small per-therm surcharge to help fund low-income customer assistance programs (such as LIHEAP). Typically $0.01–$0.05 per therm.

Gas System Improvement Rider (or Infrastructure Rider)

Some utilities are mid-way through major pipeline replacement programs and have regulatory approval to recover those costs through a rider surcharge. This is usually a temporary charge that expires when the improvement project is complete.

Balancing Charge

Natural gas in pipelines must physically balance — the amount injected must equal the amount withdrawn. If the utility miscalculated and overcharged in prior months, a balancing credit may appear. If they undercharged, a balancing charge appears. These are usually small.

How to Read the Usage Section

Most gas bills show:

• Current read date and previous read date
• Current reading and previous reading (in cubic feet or CCF)
• Units used this billing period
• Therms used (after conversion from volume to energy units)
• Comparison to last month and same month last year

The year-over-year comparison is especially useful — if you used significantly more therms this January than last January, it usually means either an unusually cold month, a change in household size, or an appliance efficiency problem.

How Gas Prices Are Set

Your natural gas bill has two distinct pricing mechanisms:

1. Commodity cost — follows the market

The price of natural gas at the wellhead is set by market forces: supply and demand, weather forecasts, storage inventory levels, and LNG export demand. Your utility passes this cost directly to customers (usually without markup). The commodity rate on your bill may change monthly or quarterly depending on your utility’s pricing structure.

Natural gas prices historically spike in:

• November–February: Heating season drives demand
• Unexpected cold snaps: “Polar vortex” events can cause dramatic temporary price spikes
• Post-hurricane seasons: Gulf Coast production disruptions

2. Distribution and transmission costs — regulated

Everything else — the infrastructure to move gas to your home — is regulated by your state utility commission. Utilities propose rate changes in formal “rate cases,” and the commission approves, modifies, or denies them after public hearings. Rate changes typically happen every 3–5 years.

Why Your Gas Bill Is Higher in Winter

Natural gas usage spikes in winter because of heating. In a typical northern US household:

• Summer gas use: 2–10 therms/month (primarily water heating and cooking)
• Winter gas use: 50–150 therms/month (heating-dominated)

The winter increase isn’t just usage — the commodity price also tends to be higher in winter due to increased demand across the country and lower storage levels.

Example of a typical annual gas bill split:

• 8 months of mild-season billing: ~$25–$50/month
• 4 months of heating season: $80–$200/month
• Total annual: approximately $600–$1,200 depending on climate and home size

Budget billing programs (offered by most utilities) average your annual usage and spread it evenly across 12 months, eliminating the winter spike. This doesn’t save money but makes budgeting easier.

How to Lower Your Gas Bill

1. Lower the thermostat (biggest impact)

Every 1°F reduction in thermostat setting reduces heating costs by approximately 1–3%. Setting your thermostat from 70°F to 68°F can save 2–6% on your heating bill over the season.

A programmable or smart thermostat automates this — schedule setbacks to 60–62°F when you’re asleep or away and return to comfortable temperatures before you wake or arrive home.

2. Insulate and air seal

Heat escaping through attic insulation gaps, rim joists, and drafty windows or doors is a direct increase in your gas bill. A home energy audit (often free or subsidized through your utility) identifies where you’re losing heat. Attic insulation and air sealing often have payback periods of 3–5 years.

3. Service your furnace or boiler annually

A dirty furnace filter, clogged burner, or poorly calibrated combustion reduces efficiency. Annual HVAC maintenance keeps your system running at rated efficiency and identifies problems before they become expensive.

4. Lower water heater temperature

Many water heaters are shipped at 140°F. Lowering to 120°F reduces gas usage by 4–8% with no noticeable difference for most households.

5. Apply for utility assistance programs

If you’re income-eligible, programs like LIHEAP (Low Income Home Energy Assistance Program) can significantly offset winter heating costs. Contact your utility or visit benefits.gov to check eligibility.

For more on reducing bills overall, see: How to Lower Your Utility Bills

Frequently Asked Questions

What does “distribution charge” mean on my gas bill?

The distribution charge pays for the local pipeline network — the infrastructure that delivers gas from the regional transmission grid to your home. It includes the costs of maintaining underground pipes, pressure regulation equipment, meters, and the workers who operate this system. This charge is regulated by your state’s utility commission and doesn’t change with the commodity gas price.

Why is my gas bill so high even though I barely use gas?

The customer charge (monthly service fee) means there’s a fixed cost every month regardless of usage. If you’re using very little gas — perhaps you have an electric stove and just a gas water heater — the customer charge can represent a large percentage of your bill even though your actual consumption is minimal. You’re paying to remain connected to the gas system.

What is a “therm” on a gas bill?

A therm is a unit of heat energy equal to 100,000 BTUs. Your gas meter measures cubic feet of gas, which is then converted to therms based on the gas’s heat content. One therm is approximately 100 cubic feet (CCF) of natural gas at standard heat content. Your bill charges you per therm, not per cubic foot.

Why does my gas rate change month to month?

The commodity portion of your gas rate (the cost of the gas itself) adjusts monthly based on wholesale natural gas market prices. This is a pass-through cost — your utility buys gas on the market and passes the actual cost to customers. The distribution and transmission portions are regulated and change only when the utility files a rate case with the state commission.

Can I switch natural gas providers?

In some states, yes. Retail natural gas competition exists in states including Georgia, Ohio, New York, and parts of Texas. In these states, you can choose your gas commodity supplier while still using your local utility’s distribution infrastructure for delivery. Shopping around can sometimes save on the commodity portion of your bill. In most states, your local utility is the only gas provider and switching isn’t an option.