Managing domestic utility expenses is a critical part of household budgeting in Bihar, especially during scorching summers and humid monsoon months. In Bihar, the distribution and supply of power are split geographically between two state-owned utilities under the Bihar State Power Holding Company Limited (BSPHCL): the North Bihar Power Distribution Company Limited (NBPDCL) and the South Bihar Power Distribution Company Limited (SBPDCL). Under the state government’s welfare schemes, domestic consumers receive substantial financial relief. Our updated Bihar electricity bill calculator 2026 makes it simple to estimate your monthly costs, applying the latest tariff policies and subsidy rules automatically.
To understand the exact breakdown of what each unit of power costs, we recommend reading our dedicated guide on the 1 unit electricity price in Bihar. That companion article walks through the residential categories, fixed charges, and government concessions in full. Together, that resource and this calculator provide everything you need to audit your power consumption and verify your billing accuracy.
In the sections below, we explain how the state’s 125-unit free subsidy works under the Mukhyamantri Vidyut Upbhokta Sahayata Yojana, guide you through standard tariff rates, share step-by-step billing examples using the official formula, and provide five practical tips on how to save electricity bill in Bihar.
The 125 Units Free Subsidy Scheme: Mukhyamantri Vidyut Upbhokta Sahayata Yojana
In Bihar, residential electricity supply features a highly consumer-friendly subsidy model. Under the state government’s Mukhyamantri Vidyut Upbhokta Sahayata Yojana, domestic accounts are eligible for a major consumption subsidy designed to keep basic lighting and household utilities affordable:
- Complete Free Limit: If your monthly electricity consumption is 125 units or less, you receive a full subsidy. This means both your energy charges and your fixed monthly charges are subsidized to ₹0, resulting in a zero base bill.
- Billing Above the Limit: If your consumption exceeds 125 units in a month, the subsidy is applied as a flat deduction. Your billable energy charge is calculated only on the units consumed *above* the 125-unit threshold. For example, if you consume 180 units, you are only billed for 55 units (180 minus 125).
- Fixed Charge Triggers: The monthly fixed charges (₹80/kW for urban, ₹40/kW for rural) are only applied to your bill if your monthly consumption exceeds the 125-unit free threshold. If you stay under 125 units, fixed charges are not billed.
- Eligibility: This Bihar electricity subsidy 125 units scheme applies to all active domestic consumers under the DS-I (Rural) and DS-II (Urban) categories. There is no special registration needed; the subsidy is automatically applied by NBPDCL and SBPDCL systems.
This subsidy structure makes it highly advantageous for households to monitor their energy draw. Keeping your monthly usage at or below 125 units ensures that your electricity costs remain virtually zero, except for minor local taxes if applicable.
Electricity Bill Calculators for Neighboring States
Compare Bihar’s utility structures with neighboring regions. Check out the Jharkhand Electricity Bill Calculator, the Uttar Pradesh Electricity Bill Calculator, or the West Bengal Electricity Bill Calculator to see how rates and subsidies compare.
How to Calculate Bihar Electricity Bill Online (Step-by-Step)
If you want to know how to calculate Bihar electricity bill online using our tool, follow these simple steps to get an accurate projection:
- Step 1: Check Your Monthly Consumption: Retrieve your current unit consumption. You can find this on your physical billing statement or by using the official smart meter app.
- Step 2: Enter Your Total Units: Type your consumed units into the calculator input box.
- Step 3: Select Connection Category: Choose “Domestic DS-II (Urban)” for standard city homes, or “Domestic DS-I (Rural)” for village homes.
- Step 4: Input Connected Load: Enter your sanctioned connected load in kilowatts (kW). This determines your fixed charges if you consume over 125 units.
- Step 5: Review the Result: The calculator applies the flat ₹7.42 rate to any units exceeding 125, adds the corresponding fixed charges (₹80/kW or ₹40/kW), calculates the Bihar electricity duty 6 percent levy, and displays the total estimated bill.
Bihar Domestic & Commercial Tariff Slabs (FY 2026-27)
The table below details the official tariff rates and fixed charges for residential, commercial, industrial, and EV charging categories in Bihar:
| Connection Category | Monthly Consumption Slab | Base Rate / Unit (₹) | Fixed Charge (₹/kW/month) | Key Conditions & Subsidy Details |
|---|---|---|---|---|
| Domestic DS-I (Rural) (Loads up to 5 kW) |
0 – 125 Units | ₹ 0.00 | ₹ 0.00 | 125 units free under Mukhyamantri Yojana. Excess units charged at ₹7.42. Fixed charge of ₹40/kW applies only when consumption exceeds 125 units. |
| Above 125 Units | ₹ 7.42 | ₹ 40.00 | ||
| Bihar domestic tariff DS-II (Urban Domestic) |
0 – 125 Units | ₹ 0.00 | ₹ 0.00 | 125 units free under Mukhyamantri Yojana. Excess units charged at ₹7.42. Fixed charge of ₹80/kW applies only when consumption exceeds 125 units. |
| Above 125 Units | ₹ 7.42 | ₹ 80.00 | ||
| Non-Domestic NDS-II (Urban Commercial) |
All Units (Flat) | ₹ 7.73 | ₹ 300.00 | For retail stores, commercial offices, and businesses. Connected load based fixed charges. |
| LTIS-I Industrial (Low Tension Industry) |
All Units (Flat) | ₹ 7.79 | ₹ 278.00 | For small industrial workshops and manufacturing units. |
| EV Charging Station | All Units (Flat) | ₹ 8.72 | ₹ 0.00 | For public electric vehicle charging infrastructure. No fixed monthly charges. |
Real Worked Examples Using the NBPDCL Bill Calculation Formula for Domestic
To make the calculations transparent, we show how the billing engine processes different consumption volumes. These examples apply the standard NBPDCL bill calculation formula for domestic urban connections (DS-II) with a sanctioned load of 2 kW:
Example 1: Consumption of 100 Units (Within Subsidy Slabs)
If your household consumes 100 units during a billing cycle, your usage falls below the 125-unit limit:
| Billing Component | Calculation Details | Cost (₹) |
|---|---|---|
| Energy Charge | 100 units (fully subsidized under Mukhyamantri Yojana) | ₹ 0.00 |
| Fixed Charge | Subsidized to ₹0 when consumption is ≤ 125 units | ₹ 0.00 |
| Electricity Duty (6%) | 6% of Energy Charge (₹0) | ₹ 0.00 |
| Estimated Monthly Bill | ₹ 0.00 | |
Example 2: Consumption of 125 Units (At the Subsidy Limit)
If your consumption is exactly 125 units, the subsidy remains 100% active:
| Billing Component | Calculation Details | Cost (₹) |
|---|---|---|
| Energy Charge | 125 units (fully subsidized) | ₹ 0.00 |
| Fixed Charge | Subsidized to ₹0 when consumption is ≤ 125 units | ₹ 0.00 |
| Electricity Duty (6%) | 6% of Energy Charge (₹0) | ₹ 0.00 |
| Estimated Monthly Bill | ₹ 0.00 | |
Example 3: Consumption of 200 Units (Exceeding the Subsidy Limit)
If you consume 200 units, the billing engine deducts 125 free units, applies the ₹7.42 flat rate to the remaining 75 units, and charges standard fixed fees and duty:
| Billing Component | Calculation Details | Cost (₹) |
|---|---|---|
| Subsidized Units | First 125 units (₹0.00 energy cost) | ₹ 0.00 |
| Billable Units | 75 units (200 – 125) × ₹7.42 per unit | ₹ 556.50 |
| Fixed Charge | Sanctioned Load 2 kW × ₹80.00 per kW | ₹ 160.00 |
| Electricity Duty (6%) | 6% of post-subsidy energy charge (6% of ₹556.50) | ₹ 33.39 |
| Estimated Monthly Bill | ≈ ₹ 750.00 | |
Example 4: Consumption of 350 Units (Higher Residential Usage)
For a home consuming 350 units with a 2 kW load, the calculation works as follows:
| Billing Component | Calculation Details | Cost (₹) |
|---|---|---|
| Subsidized Units | First 125 units (₹0.00 energy cost) | ₹ 0.00 |
| Billable Units | 225 units (350 – 125) × ₹7.42 per unit | ₹ 1,669.50 |
| Fixed Charge | Sanctioned Load 2 kW × ₹80.00 per kW | ₹ 160.00 |
| Electricity Duty (6%) | 6% of post-subsidy energy charge (6% of ₹1,669.50) | ₹ 100.17 |
| Estimated Monthly Bill | ≈ ₹ 1,930.00 | |
How to Check Electricity Bill in Bihar Online
Understanding how to check electricity bill in Bihar is essential for managing your payments and tracking usage. Both NBPDCL and SBPDCL provide digital platforms to view your bills in real-time:
- Via Official Portals: Visit the official website of your provider (nbpdcl.co.in or sbpdcl.co.in). Click on the “Instant Payment” or “View & Pay Bill” option. Enter your 11-digit or 12-digit Consumer ID (CA Number) to download your latest detailed billing receipt.
- Via myBihar Smart App: If you are equipped with a smart prepaid meter, install the “Bihar Sugam Smart Meter” mobile application. Once registered with your mobile number, you can view your current balance, daily consumption graphs, and download transaction histories.
- Through UPI Applications: Open major payment apps like Google Pay, PhonePe, or Paytm. Select “Electricity” under utility bill payments, search for “North Bihar Power Distribution (NBPDCL)” or “South Bihar Power Distribution (SBPDCL)”, and enter your Consumer ID to view your current outstanding amount.
Using these digital options ensures you can verify your billable units, track the active subsidy, and execute your NBPDCL and SBPDCL bill payment securely before the monthly due date to avoid service disconnections or late payment surcharges.
5 Practical Ways to Save Electricity Bill in Bihar
💡 Pro Tip: Eliminate Your Electricity Bills with Solar!
Instead of just reducing your appliance usage, installing a grid-connected rooftop solar system can completely wipe out your electricity bills. You can generate your own power and even sell the excess back to SBPDCL/NBPDCL. Use our new Bihar Solar Bill Calculator to instantly estimate your installation cost, government subsidies, and monthly savings in seconds.
Since the state’s billing system fully subsidizes the first 125 units, keeping your consumption as close to this boundary as possible has direct financial benefits. Here are five practical strategies on how to save electricity bill in Bihar:
1. Target the 125-Unit Subsidy Boundary
The most effective way to lower your power bill is to stay under the 125-unit limit. Monitor your consumption weekly by checking your meter reading. If you are close to 100 units with a week left in your billing cycle, cut back on running heavy appliances (like washing machines or geysers) to keep your energy and fixed charges at ₹0.
2. Request a Sanctioned Connected Load Audit
For urban DS-II connections, fixed charges are ₹80 per kW per month. If your sanctioned load is 4 kW but your actual peak demand is only 1.5 kW, you are paying ₹320 in fixed charges every month (if consumption is >125 units). Submit an online load-reduction request through the NBPDCL/SBPDCL portal to downsize to 2 kW, saving ₹160 monthly.
3. Switch Traditional Ceiling Fans to BLDC Models
Ceiling fans run constantly during Bihar’s hot, humid summers. A standard ceiling fan draws 75 to 80 Watts. Upgrading to a BEE 5-star Brushless DC (BLDC) motor fan reduces consumption to 28-35 Watts. Running three BLDC fans instead of old models saves around 45 to 50 units per month, which keeps you safely within the 125-unit free limit.
4. Run Your AC at 26°C with Auto-Cutoff
Setting your air conditioner to 18°C or 20°C forces the compressor to run continuously, driving up unit consumption. Setting it to 26°C, combined with a ceiling fan, keeps the room comfortable while allowing the AC compressor to cycle off regularly. This simple habit reduces AC-specific energy consumption by up to 25%.
5. Unplug Standby Chargers and Electronics
Leaving mobile chargers, TV set-top boxes, and microwave plugs turned on at the wall sockets draws “standby power” even when the device is not active. Over a month, this phantom load can add 5 to 8 units to your consumption. Turning off appliances at the main switch prevents these small standby leaks from pushing your bill past the 125-unit free slab.
Frequently Asked Questions (FAQs)
Is the 125-unit free electricity scheme applicable to commercial accounts?
No. The Mukhyamantri Vidyut Upbhokta Sahayata Yojana is exclusively designed for domestic connections under the DS-I (Rural) and DS-II (Urban) categories. Commercial connections (NDS-II) and industrial connections are billed at flat rates from the very first unit consumed.
What is the electricity duty rate in Bihar?
Bihar implements a flat state electricity duty of 6% on domestic, commercial, and industrial connections. This 6% levy is calculated on your total post-subsidy energy charge. If your energy charge is subsidized to ₹0 (under 125 units), the duty amount is also ₹0.
How do I verify if my smart meter recharge has been updated?
You can check your real-time balance and recharge logs instantly via the “Bihar Sugam Smart Meter” app. Once a transaction is completed, the prepaid balance is updated on the server within 10 to 15 minutes, which will be visible on your app dashboard.
Where is the Consumer ID (CA Number) located on the bill?
Your unique 11-digit (for rural/urban legacy) or 12-digit Consumer ID (CA Number) is printed at the top-left section of your paper electricity bill. It is also displayed under your account name on the digital myBijulee or Sugam Smart Meter dashboards.
⚠️ Important Disclaimer
This calculator is an independent reference tool created using publicly available tariff data for Bihar (FY 2026-27). It is NOT an official calculator. We are in no way officially connected with the North Bihar Power Distribution Company Limited (NBPDCL), the South Bihar Power Distribution Company Limited (SBPDCL), or the Bihar State Power Holding Company Limited (BSPHCL).
For official billing inquiries, dispute resolutions, and formal tariff schedules, please refer directly to the official BSPCL portal:
BSPCL Official Portal →
⚖️ Editorial & Data Verification Disclaimer
The tariff rates, slabs, and calculation presets used on this page are compiled and audited from the official tariff schedules released by the Bihar Electricity Regulatory Commission (BERC). While we update our database regularly to reflect current active notifications, users are advised to verify their official bills on the official portal at BERC Website.