Annual cost
$72,000
Electricity Cost Calculator
Estimate monthly and annual electricity bills from consumption, a flat or time-of-use tariff and any demand charge — with a transparent scenario comparison.
Result
Enter your load → get a full design & BOM in seconds
Sample outputEstimated monthly electricity cost
$6,000
50,000 kWh/month · Flat rate @ $0.12/kWh
Effective $/kWh
$0.1200
Energy charge
$6,000
Demand charge
$0
Cost breakdown
| Energy charge | Flat rate @ $0.12/kWh = $6,000 |
| Demand charge | 0 kW × $0/kW = $0 |
| Monthly total | $6,000 |
| Annual total | $6,000 × 12 = $72,000 |
Scenario comparison
| Flat-rate energy cost | $6,000 |
| If 30% shifted to valley @ $0.08 | $5,400 |
| Arithmetic difference | $600 (depends on actual tariff eligibility) |
Note
This is a transparent arithmetic estimate of billed cost. Actual savings depend on the utility tariff schedule, demand charges, power factor penalties and eligibility — verify with your bill before acting.
For energy managers, facility owners and businesses estimating bills, comparing tariffs or quantifying the energy-cost impact of a more efficient transformer.
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Worked example
A pre-computed reference example (crawlable — no JavaScript required). Enter your own parameters above for a live result.
Example 1 — flat-rate 50,000 kWh/month
Estimated monthly electricity cost
$6,000
50,000 kWh/month · Flat rate @ $0.12/kWh
Annual cost
$72,000
Effective $/kWh
$0.1200
Energy charge
$6,000
Demand charge
$0
Cost breakdown
| Energy charge | Flat rate @ $0.12/kWh = $6,000 |
| Demand charge | 0 kW × $0/kW = $0 |
| Monthly total | $6,000 |
| Annual total | $6,000 × 12 = $72,000 |
Scenario comparison
| Flat-rate energy cost | $6,000 |
| If 30% shifted to valley @ $0.08 | $5,400 |
| Arithmetic difference | $600 (depends on actual tariff eligibility) |
Note
This is a transparent arithmetic estimate of billed cost. Actual savings depend on the utility tariff schedule, demand charges, power factor penalties and eligibility — verify with your bill before acting.
Example 2 — time-of-use with demand charge
Estimated monthly electricity cost
$7,350
50,000 kWh/month · Time-of-use: 50% peak @ $0.15 + 50% valley @ $0.08 · demand $1,600
Annual cost
$88,200
Effective $/kWh
$0.1470
Energy charge
$5,750
Demand charge
$1,600
Cost breakdown
| Energy charge | Time-of-use: 50% peak @ $0.15 + 50% valley @ $0.08 = $5,750 |
| Demand charge | 200 kW × $8/kW = $1,600 |
| Monthly total | $7,350 |
| Annual total | $7,350 × 12 = $88,200 |
Scenario comparison
| Flat-rate energy cost (same kWh) | $6,000 |
| Time-of-use energy cost | $5,750 |
| TOU saving vs flat | $250 (lower) |
Note
This is a transparent arithmetic estimate of billed cost. Actual savings depend on the utility tariff schedule, demand charges, power factor penalties and eligibility — verify with your bill before acting.
How it was calculated
- · Energy charge = kWh × rate (flat), or peak kWh × peak rate + valley kWh × valley rate (time-of-use).
- · Demand charge = demand (kW) × demand rate ($/kW/month).
- · Monthly total = energy charge + demand charge.
- · Annual total = monthly total × 12.
- · Effective rate = total monthly bill ÷ kWh.
Referenced standards
| Standard | Scope |
|---|---|
| IEC 60364-8-1 | Low-voltage electrical installations — energy efficiency |
| GB 20052 | Minimum allowable values of energy efficiency for power transformers |
Frequently asked questions
How do I calculate my monthly electricity bill from kWh?
Bill = energy charge (kWh x tariff) + demand charge (peak kW x rate) + fixed charges. At $0.12/kWh, 10,000 kWh costs $1,200 in energy, plus a demand charge of $5-15/kW for the peak. The calculator handles flat and time-of-use tariffs and demand charges.
What is a demand charge and how does it affect my bill?
A demand charge bills the highest 15-30 minute average power (kW) drawn during the billing period, rewarding a flat load profile. A single 200 kW peak can add $1,000-3,000/month at $5-15/kW. Load shifting and storage reduce it. The calculator includes demand charges in the monthly and annual estimate.
What is time-of-use (TOU) pricing?
Time-of-use pricing charges different rates by time of day — higher during peak hours (e.g. 4-9 pm) and lower off-peak. Peak rates are often 2-3x off-peak. Shifting flexible load to off-peak cuts the bill 10-30%. The calculator applies peak/off-peak rates to your usage split.
How much does a 100 kW load cost per month?
A continuous 100 kW load uses 72,000 kWh/month. At $0.12/kWh that is $8,640 in energy, plus a demand charge (100 kW x $5-15 = $500-1,500), totaling roughly $9,100-10,100/month. The calculator computes this from your load, tariff and demand rate.
How can I reduce my electricity bill?
Three levers: cut consumption (efficiency, power-factor correction), shift load off-peak (time-of-use), and shave the demand peak (storage, load scheduling). Power-factor correction alone can remove a penalty of 0.5-3% of the bill. The calculator's cost model shows where each lever saves.
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Results are engineering estimates for preliminary design and reference only. Always verify with the applicable standards, the equipment nameplate and a licensed engineer before procurement or installation.
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