1. Charge Breakdown
| Charge Item | Basis / Calculation | Amount (Rs.) |
|---|---|---|
| Industrial Energy Charges | Net Consumption × Rate — Gross 168,876 kWh − Solar Adjustment 146,224 kWh = Net Billed 22,652 units × Rs. 7.50 | 1,69,890.00 |
| Peak Hour Surcharge | 22,652 units × Rs. 1.875 | 42,472.50 |
| Demand Charges | Billing Demand × Rate — Recorded 784.80 kVA vs. 90% of Permitted MD 855.00 kVA (950×0.90) → higher of the two (855 kVA) × Rs. 608.00 | 5,19,840.00 |
| Meter Rent | Fixed monthly utility fee | 4,090.00 |
| Electricity Tax | 5% on taxable amount | 34,476.00 |
| Testing Fees | Fixed statutory fee | 4,270.00 |
| Assessment Amount | Subtotal of all tax-affecting charges above | 7,75,039.00 |
2. Open Access Adjustments
| Component | Amount (Rs.) |
|---|---|
| Wheeling Charges | 77,570.00 |
| Transmission Charges | 96,848.00 |
| DSM (Deviation) Charges | 36,018.00 |
| RKvah (Reactive Power) Penalty | 8,731.00 |
| System Operation & Scheduling Charges | 8,159.00 |
| AMR Meter Reading Charges | 445.00 |
| Total — Open Access Adjustments | 2,27,771.00 |
3. Self-Generation & Net Payable
| Item | Basis | Amount (Rs.) |
|---|---|---|
| Self Generation Tax | Tax on captive solar consumption | 14,622.00 |
| Net Amount Payable | Assessment (7,75,039) + Adjustments (2,27,771) + Self-Gen Tax (14,622) | 10,17,432.00 |
4. Plant Energy Profiling
Time-of-day (TOD) register readings for the billing period. Multiplier (MF) = 1,200 for all slots.
| Slot | Description | Total Billed | Recorded Peak Demand |
|---|---|---|---|
| C24 | Gross (Total Recorded) | 168,876 kWh | 784.80 KVA |
| C1 | Peak Hours (06:00–09:00 & 18:00–21:00) | 30,648 kWh | 740.40 KVA |
| C2 | Normal Hours | 19,344 kWh | 757.20 KVA |
| C3 | Night Hours (22:00–05:00) | 0 kWh | 0.00 KVA |
| C5 | Solar Hours (peak solar window) | 27,816 kWh | 410.40 KVA |
| kVAhr | Apparent Energy (total power drawn) | 185,520 kVAhr | N/A |
| rkVAhr | Reactive Energy (inductive lag) | 30,708 rkVAhr | N/A |
5. Key Insights
Solar netting drives the real energy charge
Billing starts from a gross total of 168,876 kWh. 146,224 kWh of that is deducted via solar/open-access adjustment, leaving a net billed consumption of only 22,652 kWh — the figure the energy rate and peak-hour surcharge are actually calculated on. The Rs. 10.17 lakh final payable layers demand charges, open-access adjustments, and taxes on top of that smaller net figure.
Demand charges are the single largest line item
At Rs. 5,19,840, demand charges alone are 67% of the Assessment Amount (51% of the final Net Payable) — more than three times the energy charge itself. Billing lands at the 90%-of-contract-demand floor (855 KVA) even though actual recorded demand (784.80 KVA) was lower, meaning Unimech is paying for reserved capacity it didn't draw down to. This is the highest-leverage line item: either lowering real peak draw or renegotiating the permitted MD (950 KVA) downward has a large, direct effect on the bill.
Non-energy adjustments are a meaningful, semi-controllable cost
Rs. 2,27,771 in open-access wheeling, transmission, DSM deviation, reactive-power penalty, scheduling, and AMR charges sit outside the core energy/demand calculation but still add roughly 29% on top of the Assessment Amount. The DSM and RKvah components in particular trace back to on-site operating discipline (load scheduling, power factor) rather than fixed tariff structure — addressable, not just payable.
Time-of-day slotting penalizes shiftable load
Peak Hour consumption (06:00–09:00 & 18:00–21:00) carries a Rs. 1.875/unit surcharge. Any melting or heating load that can be shifted out of that window into Night or Solar hours is charged at a lower or zero surcharge for the same units consumed — one of the more direct, actionable levers once load-by-time visibility exists (see the SLD's Meter 1 pre-alarm and TOD tracking).
The underlying driver: furnace load signature
The plant's 350kW Inductotherm induction melting power supply creates the electrical behaviour behind several of the adjustment items above: reactive-power (RKvah) penalty from sub-optimal power factor under furnace loading (recorded PF = 168,876 ÷ 185,520 = 0.91); DSM deviation charges from unscheduled demand swings during melt cycles; and peak-hour surcharge exposure from shiftable load running inside the peak window. This is why Meter 2 (the furnace feeder) is the priority metering point in the SLD.
References & Attachments
Source documents and equipment nameplates the figures above and in the SLD are drawn from.
Transformer Nameplate
Esennar Transformers, 1,250 kVA, 22000V/433V, Dyn11, LV current 1,666.76A — confirms the SLD's transformer FLC figure directly against the physical nameplate.
Furnace Nameplate
Inductotherm (India) Ltd. induction melting power supply — 415V±10% 3-phase, max input 600A/line, output 350kW. Confirms the SLD's Meter 2 sizing directly against the physical nameplate.