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A mini PC drawing a continuous 20 watts uses 0.48 kWh per day, 14.4 kWh in a 30-day month, or 175.2 kWh in a 365-day year. To estimate the electricity charge in India, multiply that energy use by the applicable rate for your state, utility, household category and consumption slab. There is no single India-wide household rate that gives everyone the same cost.
How much electricity does a 20 W mini PC use?
The calculation assumes the computer draws 20 watts continuously at the wall for the full period. The energy formula is average watts × hours ÷ 1,000 = kilowatt-hours (kWh).
| Period | Calculation | Energy use |
|---|---|---|
| One day | 20 W × 24 hours ÷ 1,000 | 0.48 kWh |
| 30-day month | 0.48 kWh × 30 days | 14.4 kWh |
| 365-day year | 0.48 kWh × 365 days | 175.2 kWh |
These are arithmetic estimates based on the stated 20 W input, not a measurement of a particular mini PC. Actual wall draw can differ with the hardware, workload, peripherals and power supply. If your setup averages a different wattage, substitute that figure in the formula.
Why the cost depends on where you live in India
India does not have one uniform domestic electricity price for this estimate. The Ministry of Power says retail tariffs are determined by the appropriate State Electricity Regulatory Commissions; state governments may also subsidize electricity for eligible consumer classes. Use the tariff schedule and bill for your state, distribution utility, consumer category and monthly consumption slab. The Ministry of Power’s 10 August 2026 statement puts it this way: “Electricity tariffs in India are determined by the Appropriate Electricity Regulatory Commissions under the Electricity Act, 2003.”
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For a practical estimate, identify the energy rate that applies to the additional units your household would use. Slab-based billing means the relevant marginal rate may depend on your total monthly use. A subsidy can also affect the amount you actually pay. Multiplying kWh by a listed energy rate estimates only the energy-charge component; fixed charges and other local bill items may apply too.
A dated Lakshadweep tariff example
The Union Territory of Lakshadweep’s Department of Electricity lists these domestic LTDS-II energy rates in its FY 2026-27 tariff schedule. This is a local illustration, not an India-wide rate.
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| Listed consumption slab | Energy rate | Charge for 14.4 kWh at that rate |
|---|---|---|
| 0–100 units | ₹3.55/kWh | ₹51.12 |
| 101–200 units | ₹5.30/kWh | ₹76.32 |
| 201–300 units | ₹7.70/kWh | ₹110.88 |
| 301–400 units | ₹10.05/kWh | ₹144.72 |
| Above 400 units | ₹13.05/kWh | ₹187.92 |
The last column is simply 14.4 kWh multiplied by each listed rate; it does not predict the full bill or determine which slab applies to a household. The schedule also lists a fixed charge of ₹25 per kW per month or part thereof. Your bill may include that and other applicable components, and a subsidy may change what you pay. See the Lakshadweep FY 2026-27 tariff schedule for the local terms.
How to calculate your own monthly cost
- Find average wall draw. If you have a reliable measured average in watts for the complete setup, use it instead of assuming 20 W. A plug-in electricity usage monitor that reports watts or kWh can help refine the estimate; ENERGY STAR’s criteria include plug-load and home energy monitors capable of reporting power or energy consumption. That does not establish the accuracy or availability of any particular device in India. See ENERGY STAR’s home energy management criteria.
- Calculate energy use. Multiply average watts by operating hours, then divide by 1,000. For a full 30-day month, use 720 hours; for a full 365-day year, use 8,760 hours.
- Check your bill and local tariff. Confirm your utility, domestic category, current slab, fixed charges and any subsidy treatment. Use the applicable marginal energy rate rather than assuming the lowest rate applies to every added unit.
- Estimate the energy-charge increase. Multiply the calculated kWh by the applicable energy rate. Treat the result as an energy-charge estimate, not necessarily the change in your complete bill.
What the electricity estimate does—and does not—cover
The figures above cover the assumed computer load only. They do not establish the actual draw of your mini PC or account for additional equipment such as a monitor, router or other peripherals. Include any equipment you intend to leave running by measuring or estimating its average power separately and adding its kWh to the total.
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The Central Electricity Authority lists a report titled “Tariff and Duty of Electricity Supply in India – March 2026”, but a national average from that report is not used here. For a household estimate, the relevant local tariff and bill provide the needed rate and billing context.
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