Bihar's smart meters show remaining prepaid credit in real time. The electricity bill adds fixed charges, duty, and arrears the meter never tracks. Here is what each number means and which one requires action.

Bihar consumers with smart prepaid meters frequently notice a gap between the balance on the meter display and the amount on their electricity bill. The gap is not an error in either document. The meter and the bill are two separate records, tracking two different aspects of the same electricity connection.

Understanding this distinction tells you which number requires action, when to recharge, and when to contact the discom.

For NBPDCL and SBPDCL consumers, Bajaj Pay, the Bharat Connect payments platform on Bajaj Finance, shows the exact outstanding amount before you confirm, through UPI, cards, or net banking.

Bihar's Smart Meter System

Both NBPDCL, which covers North Bihar, and SBPDCL, which covers South Bihar including Patna, Gaya, and Bhagalpur, operate on a prepaid smart metering model. Both are subsidiaries of BSPHCL, Bihar State Power Holding Company Limited.

Together, they serve 1.85 crore consumers across the state, per official government documentation on Bihar's metering programme. Around 50 lakh NBPDCL electricity bill payment accounts and smart meters are now active, per the Bihar Energy Minister's official statement.

In a prepaid system, the consumer loads credit onto the meter in advance. The meter draws down from that credit as electricity is consumed. Supply continues as long as credit is available.

This is the starting point for understanding why the meter balance and the billing statement show different figures. The meter records one part of the account. The bill records another.

What the Smart Meter Balance Shows

The figure on the smart meter display is the remaining prepaid credit available for consumption. It is a live figure that changes continuously.

What makes it fall:

Each unit of electricity consumed reduces the balance at the applicable rate per unit.

Why it falls faster at certain times:

Bihar operates a Time-of-Day tariff under BERC, the Bihar Electricity Regulatory Commission. Electricity consumed during peak evening hours is charged at a higher rate than daytime consumption. A consumer using the same number of units in the evening as in the afternoon will see a larger balance reduction in the evening. This is expected behaviour under the tariff, not a malfunction.

Why it may not update after a recharge:

When a consumer tops up the smart meter, the system generates a Standard Transfer Specification token, called an STS token, delivered by SMS to the registered mobile number.

This token must be entered into the meter manually for the balance to update.

Until the token is entered, the display shows the pre-recharge balance, even though the payment has gone through successfully. If the balance appears unchanged after a recharge, check whether the STS token has been entered before raising a complaint.

What the Electricity Bill Shows

The billing statement from NBPDCL or SBPDCL is a comprehensive account document. It records consumption for the billing period and applies all applicable charges, many of which never appear on the smart meter display.

Charge Component	In Meter Balance	In Bill
Energy charges: units consumed at applicable rate	Yes	Yes
Fixed charge: monthly fee based on sanctioned load	No	Yes
FPPAS: fuel and power purchase adjustment surcharge	No	Yes
Electricity duty: state government levy	No	Yes
125-unit free credit: Bihar government scheme	Separately adjusted	Yes, timing may vary
Pre-installation arrears	No	Yes, if outstanding

The fixed charge accounts for most of the gap consumers notice.

Every NBPDCL and SBPDCL connection carries a fixed monthly charge based on the sanctioned load, payable regardless of consumption. This charge is not deducted from the prepaid balance. It is billed separately.

A consumer who recharged Rs. 500 and receives a bill for Rs. 640 is looking at two separate figures. The Rs. 500 relates to energy consumed. The Rs. 140 represents fixed charges, duty, and other components billed outside the meter entirely.

From August 2025, Bihar's domestic consumers receive 125 units of free electricity per month under the state government's scheme, benefiting 1.67 crore households. The timing of this credit on the meter versus its reflection on the billing statement can differ by a billing cycle. This is an administrative sequencing difference, not a loss of the entitled benefit.

Which Figure Requires Action

In a prepaid smart meter system, the primary obligation is keeping the meter balance sufficient to maintain uninterrupted supply.

The billing statement handles what falls outside the meter: fixed charges, duty, surcharges, and any arrears. If the statement shows an outstanding amount that the prepaid recharge does not cover, that balance requires a separate payment.

If the statement contains a figure that cannot be accounted for by the components described above, contact the NBPDCL or SBPDCL helpline on 1912, available 24 hours a day, seven days a week. Have the consumer number, recharge history, and statement ready. The discom can cross-reference both records and identify the specific source of the discrepancy.

Pay Your NBPDCL or SBPDCL Electricity Bill on Bajaj Finance

Whether settling an outstanding NBPDCL balance or an SBPDCL electricity bill payment, the Bajaj Finance platform fetches the current outstanding amount from the discom before you confirm payment.

Steps to pay your electricity bill:

Open the Bajaj Finance app or visit bajajfinserv.in and log in
Go to Bills and Recharges and select Electricity
Select NBPDCL for North Bihar or SBPDCL for South Bihar
Enter your consumer number and fetch the bill
Review the exact outstanding amount before confirming
Choose a payment method and complete the payment for an instant Bharat Connect receipt

The smart meter balance and the electricity bill serve different purposes within the same prepaid account. The meter shows remaining energy credit in real time. The bill accounts for all charge components across the billing period, including fixed charges and taxes that sit entirely outside the meter.

Consumers who understand this distinction are better placed to manage their recharge schedule, anticipate their billing statement, and identify genuine discrepancies when they arise.