Sub-Meter Electricity Bill Calculator
Calculate fair and mathematically transparent electricity shares for tenants, PG residents, and rental floors. Split common area motor loads, compute true DISCOM blended rates, and audit landlord flat-rate unit charges.
Sub-Meter Electricity Billing divides a single master utility bill proportionally among multiple occupants. The fair calculation divides the total master bill (including slabs, fixed charges, and taxes) by total consumed units to find the effective blended rate per unit, ensuring each tenant pays strictly for their actual consumption plus common area usage.
Master Electricity Bill & Sub-Meters Setup
Fair proportional splitting of state DISCOM master bills among tenants and rental floors.
Total final amount from official bill (including slabs, fixed charges & taxes).
Motor pump, staircase lights, common area sub-meter (or 0 if none).
How shared utility usage is divided among tenants.
Individual Tenant Sub-Meters
Enter previous and current meter readings to automatically deduct consumed units.
True all-inclusive cost (Slabs + Surcharges + Fixed fees)
480 sub-meter + 40 common units
100% fully reconciled across all tenants
Tenant 1 (Ground Floor)
46.2% of total building consumptionTenant 2 (First Floor)
53.8% of total building consumptionReady-to-Send Tenant WhatsApp Summary
Copy and paste this clean breakdown into your building or tenant WhatsApp group.
⚡ *Electricity Bill Split (Master Bill: ₹3,600)* Total Units: 520 kWh | Blended Rate: ₹6.92/unit Common Area (Motor/Staircase): 40 kWh (equal split) ------------------------------------ *Tenant 1 (Ground Floor)*: • Consumed: 220 units + 20 common = 240 units • *Amount Payable: ₹1,662* *Tenant 2 (First Floor)*: • Consumed: 260 units + 20 common = 280 units • *Amount Payable: ₹1,938* Generated via SageCalculator.in
How Sub-Meter Electricity Bills are Calculated (Official Guidelines)
Indian Electricity Act 2003 principles, blended unit rates, and common area loads.
1. The Blended Proportional Rate Method
In multi-tenant buildings sharing one DISCOM connection, the utility applies progressive tariff slabs (e.g. ₹3/unit for the first 100 units, increasing to ₹8/unit above 300 units), plus fixed sanctioned load charges, electricity duty (5–16%), and fuel adjustment charges (PPAC/FAC).
This absorbs all fixed charges and progressive slab costs fairly across all tenants in exact proportion to their consumption.
2. Legal Provisions on Commercial Power Resale
Under Section 12 and Section 14 of the Indian Electricity Act 2003, engaging in the retail distribution or resale of electrical energy without a valid state regulatory commission license is illegal.
Legal Stance for Landlords:
Landlords are only permitted to act as a collection agent recovering the actual utility expense incurred. Demanding arbitrary flat tariffs (e.g. ₹9 to ₹12/unit) when the actual DISCOM bill average is ₹6.50/unit constitutes illegal commercial profiteering.
Realistic Worked Sub-Meter Calculation Examples
Real-world tenant scenarios in Bangalore, Delhi, and Mumbai rental apartments.
₹3,600 Master Bill in Bangalore (BESCOM)
Master Bill Amount: ₹3,600
Tenant 1 (1BHK): 150 Units
Tenant 2 (2BHK): 250 Units
Common Motor Pump: 50 Units (Equal split: 25 units each)
Reconciliation: ₹1,400 + ₹2,200 = ₹3,600. Exactly 100% of the DISCOM bill is covered with zero dispute.
Tenant Billed at Flat ₹9/unit for 200 kWh
Units Consumed: 200 kWh
Landlord Flat Rate: ₹9.00 / unit
Actual DISCOM Blended Rate: ₹6.70 / unit
Verdict: The landlord is charging a 34.3% profit margin over the true utility cost, saving ₹460/month if billed on actual DISCOM rates.
Comparison of Utility Allocation Methods
Pros, cons, and legality of different sub-meter billing conventions in India.
| Billing Method | How it Works | Fairness to Tenants | Fixed Charges & Duty | Legal Compliance |
|---|---|---|---|---|
| Blended Proportional Rate (Recommended) | Total Bill ÷ Total Units; each pays units × blended rate | 100% Fair & Transparent | Proportionally shared | Fully Compliant |
| Independent Slabs Method | Applies DISCOM tariff slabs to each sub-meter individually | Moderate (causes bill deficit) | Often neglected | Acceptable |
| Landlord Flat Rate (₹8–₹12/unit) | Landlord sets arbitrary fixed rate per unit in rent agreement | Unfair (20–40% markup) | Hidden inside high unit rate | Questionable under Sec 12 |
Explore State DISCOM Electricity Calculators
Compare your effective blended rate against official state DISCOM domestic tariff slabs:
UPPCL Electricity Bill
Official LMV-1 domestic urban & rural tariff slabs with regulatory surcharges.
Mahavitaran (MSEDCL)
MSEDCL LT-1 residential tariff with Fuel Adjustment Charge (FAC) and electricity duty.
TNEB TANGEDCO Bill
Bimonthly LT-1A domestic slabs with Tamil Nadu 100 free units subsidy.
KSEB Domestic LT-1A
Official telescopic vs non-telescopic 250 unit threshold calculation.
Frequently Asked Questions (FAQs)
Authoritative guidance on sub-meters, tenant rights, and DISCOM tariff sharing.
Can a landlord legally charge ₹9 or ₹10 per unit for electricity in India?▾
Under Section 12 and Section 14 of the Indian Electricity Act 2003, no individual without a distribution license can engage in commercial power resale. Landlords are only permitted to recover the actual cost billed by the state DISCOM (such as BESCOM, UPPCL, TNEB, or Mahavitaran) on a cost-recovery basis, not to profit by inflating unit tariffs.
What is the blended rate method for splitting a master meter electricity bill?▾
The blended rate is calculated by dividing the total master bill amount (including all progressive telescopic slabs, fixed meter charges, electricity duty, and fuel adjustments) by the total units consumed across all sub-meters and common areas:
Each tenant then pays: Units Consumed × Effective Rate.
How should common area electricity (water motor, staircase lights) be divided?▾
Common electricity can either be divided equally among all occupied units (Equal Split) or allocated proportionally based on each tenant's individual consumption percentage (Proportional Split). A dedicated common sub-meter should measure motor pump and staircase consumption.
How to calculate units consumed from a digital sub-meter reading?▾
Units consumed (in kWh) are calculated by subtracting the previous month's reading from the current month's reading: Consumed Units = Current Reading - Previous Reading. Ensure you read only the active whole integer kWh digits before the red decimal point.
Why does the average rate per unit increase when multiple tenants consume power on one master meter?▾
Indian state DISCOMs employ progressive telescopic tariff slabs where initial units (e.g., 0-100) are cheap (e.g., ₹3-4/unit) and higher consumption (e.g., >300 or >500 units) is taxed at higher brackets (e.g., ₹7-8/unit). When 2 or 3 tenants share one master meter, cumulative consumption pushes the household into higher slabs faster, increasing the blended per-unit cost for everyone.