Most of the difference is colder weather — your heating ran more. You used 171 therms this period against 158 in December.
Charges and taxes for the period; any previous balance is not part of the change.
Colder weather
This period had 529 heating degree days against 486 — 9% colder. At the same gas per degree of cold, that alone is about 12 therms more.
Weather adjustment
The weather adjustment credit went from $0.0142 to $0.0187 a therm. It evens out the delivery part of your bill when weather strays from normal (505 degree days is normal for this period), softening bills in extreme winters.
Taxes and fees
The city franchise fee and taxes are a percentage of the charges above, so they move with them.
Budget billing
About $72.00 a month, from the last twelve bills, settled once a year.
Payment arrangement
Spread this bill over the next few without collection activity.
Energy assistance referral
Local agencies; a pledge pauses collections while it is processed.
Emergency line for anything that smells like gas: (979) 555-0199.
| Dec 2025 | Jan 2026 | |
|---|---|---|
| Therms billed | 158.00 | 171.00 |
| … the weather alone predicts | 170.06 | |
| Heating degree days | 486 | 529 |
| Normal degree days | 455 | 505 |
| Base load (summer) | 21.8 th | |
| Gas cost (PGA) / th | $0.41200 | $0.41200 |
| Weather adjustment / th | −$0.01420 | −$0.01870 |
| Customer charge | $22.50 | $22.50 |
| Distribution, first 50 th | $0.18240 | $0.18240 |
| Distribution, beyond | $0.14190 | $0.14190 |
| GRIP rider / th | $0.03070 | $0.03070 |
| Charges and taxes | $120.35 | $127.27 |
Starting from the Dec 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 — +$6.92 — to the cent. It reproduces every issued bill in the system exactly.