Most of the difference is colder weather — your heating ran more. You used 1,802 therms this period against 1,106 in November.
Charges and taxes for the period; any previous balance is not part of the change.
Colder weather
This period had 486 heating degree days against 322 — 51% colder. At the same gas per degree of cold, that alone is about 437 therms more.
Usage beyond the weather
Even allowing for the cold, you used about 259 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.
Taxes and fees
The city franchise fee and taxes are a percentage of the charges above, so they move with them.
Natural gas cost
The purchased gas adjustment — what we pay for the gas itself, passed through at no markup — rose from $0.3948 to $0.4120 a therm.
Budget billing
About $473.00 a month, from the last twelve bills, settled once a year.
Payment arrangement
Spread this bill over the next few without collection activity.
Free safety checkSuggested
259 therms beyond the weather. Usually a thermostat or appliance; occasionally a leak.
Energy assistance referral
Local agencies; a pledge pauses collections while it is processed.
Emergency line for anything that smells like gas: (979) 555-0199.
| Nov 2025 | Dec 2025 | |
|---|---|---|
| Therms billed | 1105.68 | 1801.63 |
| … the weather alone predicts | 1542.45 | |
| Heating degree days | 322 | 486 |
| Normal degree days | 290 | 455 |
| Base load (summer) | 248.1 th | |
| Gas cost (PGA) / th | $0.39480 | $0.41200 |
| Weather adjustment / th | −$0.01240 | −$0.01240 |
| Customer charge | $48.00 | $48.00 |
| Distribution, first 500 th | $0.10850 | $0.10850 |
| Distribution, beyond | $0.08420 | $0.08420 |
| GRIP rider / th | $0.03070 | $0.03070 |
| Charges and taxes | $673.08 | $1,088.81 |
Starting from the Nov 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 — +$415.73 — to the cent. It reproduces every issued bill in the system exactly.