Everyday Calculators
Electricity Usage Scenario Calculator
Compare current and alternative monthly kWh, rate, variable charge, credit, bill, exact horizon cash difference, and horizon energy difference.
Current monthly variable energy charge-
Current monthly bill before taxes-
Current estimated monthly bill-
Alternative monthly electricity use (kWh)-
Alternative variable rate per kWh-
Alternative monthly variable energy charge-
Alternative bill before taxes after credit-
Alternative estimated monthly bill-
Alternative minus current monthly bill-
Alternative minus current cost through horizon-
Alternative minus current electricity through horizon-
Decision view
Current versus alternative electricity statement
Current versus alternative electricity statementQuantity, rate, fixed service, credit, and tax are reconciled into two comparable statements with an explicit horizon difference.
Exact scenario comparisonAlternative change in electricity use (%) changes while all other entered assumptions remain constant.
| Alternative change in electricity use (%) | Current monthly variable energy charge | Current monthly bill before taxes | Current estimated monthly bill | Alternative monthly electricity use (kWh) | Alternative variable rate per kWh | Alternative monthly variable energy charge | Alternative bill before taxes after credit | Alternative estimated monthly bill | Alternative minus current monthly bill | Alternative minus current cost through horizon | Alternative minus current electricity through horizon |
|---|
How to use Electricity Usage Scenario Calculator
- Set current monthly kWh and variable rate from a representative bill.
- Enter usage, rate, and credit changes independently.
- Review both cash and energy differences before interpreting the scenario.
Calculator guide
Understanding Electricity Usage Scenario Calculator
An alternative electricity bill can change consumption, variable rate, and credit independently while preserving the same fixed charge and tax convention.
Calculation method
How the calculation works
Model a named alternative in which electricity quantity, variable rate, and a confirmed monthly credit can change independently while the same fixed fee, tax convention, and exact horizon are retained for comparison. Apply the usage change to current kWh, apply the rate change separately, calculate both energy charges, add the same fixed fee, subtract the alternative credit, apply tax, and multiply differences across the horizon.
Detailed calculation process
Reconcile the current statement with the alternative scenario
The default keeps the $22 fixed fee and 4% tax convention equal while changing monthly use by -12%, the variable rate by +7%, and applying a $10 alternative credit over 24 months.
General formula: B_c = (E_c r_c + F)(1+t); E_a = E_c(1+u); r_a = r_c(1+p); B_a = max(E_a r_a + F - C,0)(1+t); D_m = B_a-B_c; D_h = mD_m Usage and price changes are applied independently. The credit is deducted before tax, and the monthly alternative-minus-current difference is extended across the exact horizon.
What each symbol means
Worked substitution with the default inputs
Under the defaults, the alternative lowers the estimated bill by about $19.86 per month and $476.70 over 24 months while using 2,361.6 fewer kWh.
Scenario interpretation
Do not confuse a credit with efficiency
A lower bill can come from lower kWh, a lower rate, or a temporary credit.
Worked situations
Practical examples
- A 12% usage reduction can be offset by a 7% rate increase.
- The scenario credit reduces only the alternative subtotal.
- A negative horizon difference means the alternative costs less.
Better inputs
Useful tips
- Run scenarios with and without the credit.
- Test seasonal kWh profiles.
- Keep equipment cost outside this bill-only comparison.
Before relying on the result
Limitations and common mistakes
- Tiers, time-of-use periods, demand charges, minimums, future credit eligibility, weather, and rebound are excluded.
- Monthly conditions remain constant.
- The same fixed fee and tax convention apply to both cases.
Reference
Key terms
- Usage change
- Alternative percentage applied to current kWh.
- Rate change
- Alternative percentage applied to current variable price.
- Scenario credit
- Entered monthly amount subtracted from alternative subtotal.
- Horizon difference
- Monthly alternative-minus-current bill difference times months.
Important note
This comparison holds monthly conditions constant except for the entered usage, variable-rate, and credit changes. Tiered and time-of-use tariffs, demand charges, minimum bills, equipment costs, weather, and occupancy changes are outside the model.
Frequently asked questions
Can the bill fall while kWh rises?
Yes, if rate or credit changes more than offset usage.
Is the scenario credit guaranteed?
No. It is an entered assumption.
Are equipment costs included?
No. This compares electricity statements only.
Why is the fixed fee the same?
The scenario intentionally isolates usage, variable rate, and credit changes.