Why this bill changed

INV-2025-10-088210 · Navasota ISD — Transportation Barn · Oct 2025

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Your October bill is $53.58 higher than your September bill.

Most of the difference is gas used beyond what the weather explains. You used 229 therms this period against 125 in September.

Sep 2025$109.29
Usage beyond weather+$50.75
Gas cost+$2.83
Oct 2025$162.87

Charges and taxes for the period; any previous balance is not part of the change.

What to say

A talk track — the caller sees the same explanation in the portal

“Your October bill is $53.58 higher than your September bill. Most of the difference is gas used beyond what the weather explains.”
“It was 967% colder than last month, and gas heating follows the cold — your usage line tracks the weather line on the chart.”
“Even allowing for the cold, you used about 104 therms more than usual. Has anything changed — thermostat, a new appliance, guests? We can send someone to do a free safety check.”
“If this bill is hard right now, budget billing would make it about $225.00 every month, or we can spread this one out.”

Each cause, in words

3Largest first — what the customer reads in the portalExpand

+$50.75
Usage beyond the weather
Even allowing for the cold, you used about 104 therms more than your home usually does. Common causes: a higher thermostat, a new gas appliance, guests, or a leak. If you ever smell gas, leave and call (979) 555-0199 from outside.
+$2.83
Natural gas cost
The purchased gas adjustment — what we pay for the gas itself, passed through at no markup — rose from $0.3488 to $0.3612 a therm.
+$0.00
Weather
Neither period needed much heating, so weather does not explain the difference.

What to offer

Budget billing
About $225.00 a month, from the last twelve bills, settled once a year.
Letter
Payment arrangement
Spread this bill over the next few without collection activity.
Letter
Free safety checkSuggested
104 therms beyond the weather. Usually a thermostat or appliance; occasionally a leak.
Letter
Energy assistance referral
Local agencies; a pledge pauses collections while it is processed.
Letter

Emergency line for anything that smells like gas: (979) 555-0199.

Usage and weather

12 bill periods · zone heating degree days

Oct 2025 Sep 2025 Therms billed Heating degree days

Show the math

Therms, degree days and every rate, both bills — one change at a timeExpand

	Sep 2025	Oct 2025
Therms billed	124.57	228.55
… the weather alone predicts		124.57
Heating degree days	9	96
Normal degree days	6	88
Base load (summer)	113.0 th
Gas cost (PGA) / th	$0.34880	$0.36120
Weather adjustment / th	—	—
Customer charge	$48.00	$48.00
Distribution, first 500 th	$0.10850	$0.10850
Distribution, beyond	$0.10850	$0.10850
GRIP rider / th	$0.03070	$0.03070
Charges and taxes	$109.29	$162.87

Starting from the Sep 2025 bill, the engine re-prices it at the volume the weather predicts, then at the volume used, then swaps in this period’s gas cost, weather adjustment, and each base rate in turn. Every step is priced line by line and rounded the way the biller writes lines, so the steps add to the real difference — +$53.58 — to the cent. It reproduces every issued bill in the system exactly.