Calculating an electricity bill manually can be confusing when energy charges, government subsidy, sanctioned-load-based fixed charges, consumer categories, and Electricity Duty are applied separately. The calculation becomes more important for domestic consumers because the supplied Bihar subsidy structure provides eligible households with up to 125 free electricity units per month.
- What Is the SBPDCL Electricity Bill Calculator?
- How to Use the SBPDCL Electricity Bill Calculator
- Key Features of the SBPDCL Electricity Bill Calculator
- How the 125 Free Units Subsidy Is Calculated
- Who Can Use This Calculator?
- Why Is Our SBPDCL Electricity Bill Calculator Different From Other Tools?
- Domestic Electricity Tariff and 125 Free Units Subsidy
- Domestic Urban DS-II Tariff
- Domestic Rural DS-I Tariff
- What Happens When the Subsidy Option Is Disabled?
- Commercial NDS-II Tariff
- Industrial LTIS-I Tariff
- How the Estimated SBPDCL Bill Is Calculated
- Electricity-Saving Tips for SBPDCL Consumers
- Frequently Asked Questions
The SBPDCL Electricity Bill Calculator is a smart online utility designed for consumers served by South Bihar Power Distribution Company Limited. It helps domestic households, rural consumers, commercial establishments, and small industrial connections estimate their monthly electricity expenses before receiving the official bill.
Using the supplied Bihar Electricity Regulatory Commission FY 2026–27 tariff information, the calculator supports Domestic Urban DS-II, Domestic Rural DS-I, Commercial NDS-II, and Industrial LTIS-I connections. It calculates energy charges, the configured 125-unit domestic subsidy, sanctioned-load fixed charges, 6% Electricity Duty, and the estimated net payable amount.
SBPDCL serves electricity consumers across important South Bihar regions, including Patna, Gaya, Bhagalpur, Munger, Nalanda, Bhojpur, Buxar, Rohtas, and surrounding urban and rural areas.
Electricity usage can vary considerably across these locations. A household in Patna may use electricity for cooling, water pumping, lighting, and household appliances, while a commercial establishment in Gaya, a shop in Bhagalpur, or a small industrial unit in Munger may have higher monthly consumption and sanctioned load.
The SBPDCL Electricity Bill Calculator simplifies the complete process by displaying gross energy charges, government subsidy rebate, billable units, fixed demand charges, Electricity Duty, and the estimated final payable amount in a transparent itemized report.
What Is the SBPDCL Electricity Bill Calculator?
The SBPDCL Electricity Bill Calculator is an online electricity bill estimation tool developed for South Bihar Power Distribution Company Limited consumers. It calculates an expected monthly electricity bill using the selected connection category, monthly electricity consumption in kWh, sanctioned load in kW, and domestic subsidy status.
Unlike a basic calculator that multiplies every consumed unit by one flat rate, this tool separates subsidized and billable electricity units for eligible domestic consumers.
Under the supplied subsidy structure, the first 125 monthly units are treated as fully subsidized for eligible Domestic Urban and Domestic Rural consumers. Only the units consumed above 125 are calculated at the supplied domestic energy rate of ₹7.42 per unit.
For example, if an eligible domestic consumer uses 210 units during one billing month, the calculator divides the consumption as follows:
- Total monthly consumption: 210 units
- Subsidized electricity units: First 125 units
- Billable electricity units: 210 − 125 = 85 units
- Energy charge: 85 × ₹7.42
- Fixed demand charge: Calculated using the sanctioned load and selected domestic category
- Electricity Duty: Calculated at the configured 6% rate
This method prevents the calculator from incorrectly charging ₹7.42 on the complete 210-unit consumption when the consumer is eligible for the configured subsidy.
The calculator supports the following SBPDCL connection categories:
- Domestic Urban DS-II
- Domestic Rural DS-I
- Commercial Non-Domestic NDS-II
- Industrial LTIS-I Small Industry
- EV Charging when the applicable tariff has been configured
The supplied tariff information includes detailed rates for domestic, commercial, and small industrial categories. A specific EV charging rate was not included in the provided data, so that option should only be enabled after the applicable tariff has been configured.
How to Use the SBPDCL Electricity Bill Calculator
Calculate Your SBPDCL Bill in Five Simple Steps
Keep your latest SBPDCL electricity bill or monthly meter reading ready before starting the calculation.
Step 1: Select the Consumer Category
Choose Domestic Urban DS-II, Domestic Rural DS-I, Commercial NDS-II, Industrial LTIS-I, or another configured connection type according to the category printed on your official bill.
Step 2: Enter Monthly Electricity Units
Enter the total electricity consumed during the billing cycle. You can find the billed units on your latest SBPDCL bill or calculate them by subtracting the previous meter reading from the current reading.
Step 3: Enter the Sanctioned Load
Enter the official connected or sanctioned load in kW. The calculator uses this value to calculate the monthly fixed demand charge applicable to the selected category.
Step 4: Select the Domestic Subsidy Option
Eligible Domestic Urban and Rural consumers can keep the 125 Free Units subsidy option enabled. The subsidy option is automatically hidden when Commercial or Industrial categories are selected.
Step 5: Calculate the Bill
Click the Calculate Bill button to view gross energy charges, free-unit subsidy rebate, billable energy charges, fixed charges, 6% Electricity Duty, and the estimated net payable amount.
Key Features of the SBPDCL Electricity Bill Calculator
BERC FY 2026–27 Tariff Structure
The calculator uses the supplied South Bihar tariff information for domestic, commercial, and small industrial electricity consumers.
125 Free Units Subsidy
For eligible domestic consumers, the first 125 monthly units are automatically separated from billable electricity consumption.
Domestic Urban DS-II Support
Urban domestic consumers can estimate energy charges using ₹7.42 per billable unit and a fixed charge of ₹80 per kW per month.
Domestic Rural DS-I Support
Rural domestic consumers use the supplied ₹7.42 billable energy rate with a lower fixed demand charge of ₹40 per kW per month.
Commercial NDS-II Calculation
Commercial consumers can calculate energy charges at ₹7.73 per unit and fixed demand charges at ₹300 per kW per month.
Industrial LTIS-I Support
Eligible small industries can estimate their electricity expenses using ₹7.79 per unit and a fixed demand charge of ₹278 per kW per month.
Dynamic Subsidy Control
The domestic subsidy option is available only for eligible residential categories and is automatically hidden for commercial and industrial connections.
Sanctioned Load Charges
The calculator multiplies the entered load by the applicable per-kW fixed demand rate for the selected consumer category.
Electricity Duty Breakdown
The configured 6% State Electricity Duty is calculated and displayed separately from energy charges, subsidy, and fixed demand charges.
Downloadable Itemized Report
The detailed report shows consumption, subsidized units, billable units, subsidy value, fixed charges, duty, and the final estimated amount.
How the 125 Free Units Subsidy Is Calculated
When the domestic subsidy option is enabled, the calculator first checks the total monthly electricity consumption. If consumption is 125 units or less, the estimated domestic energy charge becomes ₹0 under the supplied scheme configuration.
If consumption exceeds 125 units, the calculator subtracts the first 125 units and charges only the remaining units at ₹7.42 per unit. Fixed demand charges and applicable Electricity Duty are calculated separately.
For example, an eligible Domestic Urban consumer using 210 units with a sanctioned load of 2 kW has 85 billable units. The energy charge is 85 × ₹7.42, while the fixed demand charge is 2 × ₹80. The calculator then applies the configured duty and displays the complete breakdown.
Who Can Use This Calculator?
The tool can be used by eligible electricity consumers across Patna, Gaya, Bhagalpur, Munger, Nalanda, Bhojpur, Buxar, Rohtas, and other SBPDCL service areas. It is useful for household budget planning, checking subsidy benefits, estimating commercial operating costs, and understanding the effect of sanctioned load on monthly fixed charges.
For the closest estimate, consumers should enter the exact tariff category, monthly consumption, sanctioned load, and subsidy eligibility shown on their official electricity bill.
The result remains an estimate. An official SBPDCL bill may also contain previous arrears, delayed payment surcharge, meter-related charges, subsidy adjustments, security-deposit revisions, penalties, or other consumer-specific amounts.
Why Is Our SBPDCL Electricity Bill Calculator Different From Other Tools?
Estimating an SBPDCL electricity bill requires more than multiplying total monthly consumption by one electricity rate. Eligible domestic consumers may receive the configured benefit of 125 free electricity units, while Urban, Rural, Commercial, and Industrial connections have different fixed demand charges.
The SBPDCL Electricity Bill Calculator first identifies the selected consumer category. For eligible Domestic Urban and Domestic Rural users, it separates the first 125 subsidized units from the remaining billable consumption. It then calculates energy charges, sanctioned-load-based fixed charges, and the configured 6% Electricity Duty.
The subsidy is not applied to Commercial NDS-II or Industrial LTIS-I connections. When one of these categories is selected, the tool automatically hides or disables the domestic subsidy option to prevent an incorrect calculation.
| Feature | SBPDCL Calculator | Basic Calculator |
|---|---|---|
| 125 Free Units Subsidy | Automatically separates subsidized and billable units | May charge all consumed units |
| Urban and Rural Categories | Uses separate fixed-charge rates | May use one common domestic formula |
| Commercial and Industrial Bills | Applies category-specific energy and load charges | May exclude fixed demand charges |
| Detailed Breakdown | Shows subsidy, energy, fixed charge, duty, and total separately | Usually displays only a rough total |
Domestic Electricity Tariff and 125 Free Units Subsidy
Under the supplied FY 2026–27 tariff data, both Domestic Urban DS-II and Domestic Rural DS-I consumers use an energy rate of ₹7.42 per billable unit.
Eligible domestic consumers can receive the configured subsidy on the first 125 units consumed during a monthly billing cycle.
- Consumption from 0 to 125 units: ₹0 estimated energy charge when the subsidy applies
- Consumption above 125 units: Only the remaining units are charged at ₹7.42 per unit
- Fixed demand charge: Calculated separately using sanctioned load
- Electricity Duty: Applied according to the configured 6% calculation rule
The free-unit benefit reduces the energy charge but does not automatically remove fixed demand charges or other applicable bill components.
Domestic Urban DS-II Tariff
| Tariff Component | Applicable Rate | Calculation Method |
|---|---|---|
| Energy Charge | ₹7.42 per billable unit | Units above 125 × ₹7.42 |
| Fixed Demand Charge | ₹80 per kW/month | Sanctioned load × ₹80 |
Example: Urban Domestic Consumer Using 210 Units
Suppose an eligible Domestic Urban consumer uses 210 units and has a sanctioned load of 2 kW.
- Total consumption: 210 units
- Free subsidized units: 125 units
- Billable units: 210 − 125 = 85 units
- Energy charge: 85 × ₹7.42 = ₹630.70
- Fixed demand charge: 2 × ₹80 = ₹160
- Subtotal before duty: ₹790.70
- Electricity Duty: Calculated at the configured 6% rate
If the configured calculator applies duty to the complete energy-and-fixed-charge subtotal, the estimated duty would be ₹47.44 and the estimated payable amount would be approximately ₹838.14. The official duty base should be checked against the consumer’s actual SBPDCL bill.
Example: Urban Domestic Consumer Using 100 Units
If an eligible consumer uses only 100 units, all consumed units fall within the configured 125-unit subsidy limit.
- Energy charge: ₹0
- Fixed charge for 2 kW: 2 × ₹80 = ₹160
- Electricity Duty: Added according to the configured taxable components
This means that free electricity units do not necessarily make the complete monthly bill zero because fixed demand charges may still apply.
Domestic Rural DS-I Tariff
Domestic Rural consumers use the same supplied energy rate of ₹7.42 per billable unit but receive a lower fixed demand charge than Urban Domestic consumers.
| Tariff Component | Applicable Rate |
|---|---|
| Energy Charge | ₹7.42 per billable unit |
| Fixed Demand Charge | ₹40 per kW/month |
Example: Rural Domestic Consumer Using 200 Units
Suppose an eligible Rural Domestic consumer uses 200 units with a sanctioned load of 2 kW.
- Subsidized units: 125 units
- Billable units: 200 − 125 = 75 units
- Energy charge: 75 × ₹7.42 = ₹556.50
- Fixed demand charge: 2 × ₹40 = ₹80
- Subtotal before duty: ₹636.50
- Electricity Duty: Calculated separately at the configured rate
What Happens When the Subsidy Option Is Disabled?
If a domestic consumer is not eligible for the configured scheme or manually disables the subsidy option, the calculator charges the complete monthly consumption at ₹7.42 per unit.
For example, without subsidy, 210 units would produce an energy charge of 210 × ₹7.42, or ₹1,558.20. With the subsidy enabled, only 85 units are billable, producing an energy charge of ₹630.70.
The difference represents the estimated value of the 125-unit energy subsidy. Fixed charges and Electricity Duty are handled separately.
Commercial NDS-II Tariff
Commercial NDS-II generally applies to eligible shops, offices, restaurants, hotels, clinics, institutions, and other non-domestic establishments.
- Energy charge: ₹7.73 per unit
- Fixed demand charge: ₹300 per kW per month
- Electricity Duty: 6% under the supplied data
Example: Commercial Consumer Using 300 Units
Suppose a commercial connection uses 300 units and has a sanctioned load of 3 kW.
- Energy charge: 300 × ₹7.73 = ₹2,319
- Fixed demand charge: 3 × ₹300 = ₹900
- Subtotal before duty: ₹3,219
- Estimated duty at 6%: ₹193.14, when applied to the subtotal
- Estimated total: ₹3,412.14
The 125-unit subsidy is not applied to Commercial NDS-II connections.
Industrial LTIS-I Tariff
Industrial LTIS-I applies to eligible workshops, processing units, manufacturing establishments, and other small industrial power consumers.
- Energy rate: ₹7.79 per unit
- Fixed demand charge: ₹278 per kW per month
Example: Industrial Consumer Using 600 Units
- Energy charge: 600 × ₹7.79 = ₹4,674
- Fixed charge for 8 kW: 8 × ₹278 = ₹2,224
- Subtotal before duty: ₹6,898
- Electricity Duty: Calculated at the configured 6% rate
How the Estimated SBPDCL Bill Is Calculated
- Select the correct consumer category.
- Enter total monthly electricity units.
- Enter the sanctioned load in kW.
- Enable the 125-unit subsidy only for an eligible domestic connection.
- Subtract subsidized units from total domestic consumption.
- Calculate billable energy charges.
- Add the applicable per-kW fixed demand charge.
- Calculate the configured 6% Electricity Duty.
- Display subsidy value, charges, and estimated total separately.
The official bill may include arrears, late-payment surcharge, meter charges, security-deposit adjustments, penalties, subsidy corrections, or regulatory revisions.
Electricity-Saving Tips for SBPDCL Consumers
- Monitor consumption carefully when usage approaches 125 units.
- Check meter readings regularly to identify unusual increases.
- Use LED bulbs and energy-efficient fans.
- Set air conditioners near 24–26°C and clean filters regularly.
- Switch off unused chargers, televisions, and computers.
- Maintain refrigerators, water pumps, and industrial motors.
- Compare current consumption with previous SBPDCL bills.
- Enter the correct sanctioned load when calculating fixed charges.
Frequently Asked Questions
How accurate is the SBPDCL Electricity Bill Calculator?
The calculator uses the supplied BERC FY 2026–27 tariff data to estimate Domestic Urban DS-II, Domestic Rural DS-I, Commercial NDS-II, and Industrial LTIS-I electricity bills. It includes billable energy charges, the configured 125-unit domestic subsidy, sanctioned-load-based fixed charges, and 6% Electricity Duty. The official bill may differ because of arrears, subsidy adjustments, penalties, tariff revisions, or account-specific charges.
Which areas can use the SBPDCL Electricity Bill Calculator?
The calculator is intended for consumers served by South Bihar Power Distribution Company Limited, including Patna, Gaya, Bhagalpur, Munger, Nalanda, Bhojpur, Buxar, Rohtas, and other SBPDCL service areas across South Bihar.
What is the SBPDCL 125 free units subsidy?
Under the supplied subsidy configuration, eligible Domestic Urban and Domestic Rural consumers receive a 100% energy-charge subsidy on the first 125 electricity units consumed during a monthly billing cycle.
Does the 125-unit subsidy make the complete electricity bill zero?
Not necessarily. Eligible consumption up to 125 units may receive a zero energy charge, but sanctioned-load-based fixed charges and applicable Electricity Duty may still be included in the estimated bill.
What happens when monthly consumption exceeds 125 units?
The calculator subtracts the first 125 subsidized units from the total consumption. Only the remaining units are charged at the supplied domestic rate of ₹7.42 per unit. Fixed charges and duty are calculated separately.
How are 210 domestic electricity units calculated?
For an eligible domestic consumer using 210 units, the first 125 units are treated as subsidized and the remaining 85 units are billable. The energy charge is calculated as 85 × ₹7.42, followed by the applicable fixed demand charge and 6% Electricity Duty.
What is the Domestic Urban DS-II tariff?
Under the supplied tariff data, Domestic Urban DS-II uses an energy rate of ₹7.42 per billable unit. The fixed demand charge is ₹80 per kW per month.
What is the Domestic Rural DS-I tariff?
Domestic Rural DS-I also uses the supplied energy rate of ₹7.42 per billable unit. Its fixed demand charge is lower at ₹40 per kW per month.
What is the difference between Urban and Rural domestic bills?
The supplied energy rate and 125-unit subsidy structure are the same for both categories. The main difference is the fixed demand charge: ₹80 per kW for Domestic Urban DS-II and ₹40 per kW for Domestic Rural DS-I.
Can I calculate my Patna or Gaya electricity bill online?
Yes. Select the category printed on your SBPDCL bill, enter monthly consumption and sanctioned load, enable the subsidy option when eligible, and click the Calculate Bill button to view the estimated itemized amount.
Can Bhagalpur, Munger, and Nalanda consumers use this calculator?
Yes. Eligible SBPDCL consumers in Bhagalpur, Munger, Nalanda, Bhojpur, Buxar, Rohtas, Patna, Gaya, and other South Bihar regions can use the calculator.
Can commercial consumers claim the 125 free units subsidy?
No. The configured free-unit subsidy applies only to eligible domestic categories. The calculator automatically hides or disables the subsidy option when Commercial NDS-II or Industrial LTIS-I is selected.
How is the Commercial NDS-II bill calculated?
Commercial NDS-II consumption is calculated at the supplied rate of ₹7.73 per unit. A fixed demand charge of ₹300 per kW per month and the configured 6% Electricity Duty are then added.
Can small industrial consumers use the calculator?
Yes. Eligible Industrial LTIS-I consumers can estimate their bill using the supplied energy rate of ₹7.79 per unit and fixed demand charge of ₹278 per kW per month.
Why is the sanctioned load important?
The sanctioned load directly affects the monthly fixed demand charge. Entering an incorrect kW value can create a noticeable difference between the calculator result and the official bill.
Where can I find my sanctioned load?
The sanctioned or connected load is generally printed on the latest SBPDCL electricity bill or connection document. Consumers should enter the official value rather than estimating it from installed appliances.
How is the 6% Electricity Duty calculated?
The calculator applies the configured 6% Electricity Duty to the taxable billing components used by the tool. The estimated duty is displayed separately from energy charges, subsidy rebate, and fixed demand charges.
Does the calculator support EV charging connections?
An EV Charging option may be included in the calculator interface, but a specific EV tariff was not included in the supplied data. The category should only be enabled after the applicable rates are configured.
Why can the estimated amount differ from the official SBPDCL bill?
The official bill may include previous balances, delayed payment surcharge, subsidy corrections, meter charges, security-deposit adjustments, penalties, rounding differences, or regulatory revisions that are not included in the estimate.
Can I download or print the detailed SBPDCL bill report?
Yes. The detailed report can show the selected category, consumption, free units, billable units, subsidy rebate, sanctioned load, fixed charges, Electricity Duty, and estimated final payable amount for viewing, printing, or downloading.
