Know what the model
is—and what it leaves out.

Offer comparison

Electricity rates are entered in cents per kWh and divided by 100 for dollar calculations. Gas rates are entered in dollars per therm. One MMBtu equals 10 therms. Ccf conversion requires the bill’s therms-per-Ccf factor.

Term usage and cost are annual amounts × months ÷ 12. This proportional scaling ignores seasonal and hourly load shape. An unknown adder or fee prevents a complete comparison; zero means confirmed absent or already included. Whole-cost stress applies the entered percentage to the complete modeled annual cost.

Utility delivery, taxes, unentered adjustments, legal terms, and supplier risk are outside this model. It compares entered offers, not promised savings.

Bill change bridge

Add the separate change in demand charges and the change in all other net charges. These components exactly sum to the change in the two modeled bill totals. The convention changes usage first and price second; it is an arithmetic attribution, not proof of causation.

Daily usage = period usage ÷ billing days. The dollar bridge still uses actual period consumption. Weather, operating changes, seasonal patterns, and tariff errors need separate investigation. A zero previous total has no percentage-change output.

Renewal dates

Only date-only calendar arithmetic is used. Dates are evaluated in UTC to avoid daylight-saving shifts. Optional earliest-notice days define a window opening. The preparation target may fall before that opening; it is not a valid send date.

180-, 120-, and 90-day reminders are planning preferences. Business days, receipt deadlines, delivery methods, holidays, notice language, and legal rights are not computed. A passed date is a reason to review the contract, not a legal determination.

Demand and load factor

Measured peak and consumption must cover the same period. A load factor over 100% is rejected. Billed demand is entered separately because it can reflect ratchets and other tariff terms. The cost difference is for one billing period only.

Load factor is not an efficiency grade. This tool does not estimate ComEd/PJM capacity PLC, Network Service PLC, or MISO capacity. Wholesale auction prices are not treated as retail demand rates.

Multi-location inventory

This is an inventory and calendar view, not an RFP engine or a seasonal forecast. Grouping by utility and commodity does not prove that meters can share a supplier contract. One row represents one account/meter; do not double-count combined bills.

End dates are sorted relative to the selected planning date. Missing dates remain unknown. The 180-day horizon is an organizational choice and does not substitute for contractual notice deadlines.

Data, examples, and downloads

Inputs stay in browser memory. There is no automatic saving, upload, email gate, or calculator input tracking. Leaving or reloading the page clears the workspace. Print or download a CSV if you want a copy.

Every loaded example is labeled illustrative. CSV text fields beginning with formula characters are neutralized on export. Browser-local import reads a CSV under 1 MB with up to 100 meters. Downloaded files may contain your confidential figures; store and share them accordingly.

Requesting a review is a separate action. Calculator values are not automatically attached to an inquiry.