Electricity Time-of-Use Comparison / no guesswork hidden
Same usage. A different electricity bill.
Replay interval consumption against explicit flat and two-period tariffs. Separate same-usage savings from hypothetical load shifting.
Saved on this browser
No cloud sync. Avoid saving sensitive records on a shared browser.
Illustrative starting inputs. Replace them with your own measurements and evidence.
Your working plan
Computed locallyReplay the tariff, not the headline rate.
Comparison of the imported intervals
0 gaps exist between intervals. Fixed charges are the amounts you entered for one bill; missing consumption and tariff rules are not invented.
Consumption by price window
kWhBefore you act
- This engine supports one flat rate and one two-period TOU tariff, a common per-kWh rider, fixed fees, one non-coincident demand charge, and a simple subtotal tax.
- Seasonal tiers, holiday calendars, ratchets, net metering, export credits, minimum bills, eligibility, and complex tax treatment are not modeled. Do not treat it as a verified utility tariff.
- Within-interval energy is assumed uniform when an interval crosses a rate boundary. Demand uses interval-average kW, which may differ from the tariff measurement window.
Bill components
| Energy | $1.20 | $1.87 |
| Common rider / delivery | $0.00 | $0.00 |
| Fixed charge | $15.00 | $20.00 |
| Entered non-coincident demand | $0.00 | $0.00 |
| Tax | $0.00 | $0.00 |
Interval audit
| 2026-09-11T15:00:00-04:00 | 60 | 1 | 0 | 1 |
| 2026-09-11T16:00:00-04:00 | 60 | 2 | 2 | -0 |
| 2026-09-11T17:00:00-04:00 | 60 | 3 | 3 | -0 |
Calculation notes & limitations
Explicit timestamp offsets disambiguate daylight-saving transitions. The tariff timezone determines weekday and peak-window assignment.
Energy is conserved between peak and off-peak buckets. Same-usage savings exclude load shifting; the separate scenario moves only the selected share of peak energy.
The tool does not annualize a partial dataset or claim that the entered rates are currently offered by a utility.
The method is part of the tool.
Import chronological interval usage with explicit UTC offsets and the actual interval duration. Reject overlap and expose gaps.
Assign energy to peak and off-peak windows in the utility timezone, then apply the entered tariff components.
Compare both tariffs on exactly the same consumption. Show load shifting only as a separate scenario, with unmodeled tariff rules disclosed.
Read the full methodologyEvidence before certainty.
These are user-entered tariff scenarios, not verified current offers or guaranteed savings. Reconcile a complete bill and all tariff terms before switching.
These are reference sources, not evidence that example records have been verified. Imported records retain the source links you provide.