You Are Probably Paying for kVA You Never Use — or Getting Fined for kVA You Touched Once
Every factory knows its energy rate. Far fewer know their billing demand — the kVA figure the fixed charges multiply — or how their DISCOM computes it. Yet on an HT bill, demand charges plus time-of-day (ToD) adjustments routinely decide whether the month was cheap or expensive, independent of how many units you consumed.
The good news: unlike the energy rate, these are levers you control — with metering data, a little discipline, and occasionally one application to the DISCOM.
How the demand game actually works
- Contract demand (CD) is the kVA you asked for and the DISCOM reserved. You pay fixed/demand charges against it whether you use it or not.
- Recorded maximum demand (MD) is your worst averaging-window of the month (commonly a 30-minute integration — check yours). One bad half-hour sets the month.
- Billing demand is typically the higher of recorded MD and a floor percentage of CD — and exceeding CD usually triggers penal rates on the excess, in some regimes on more than just the excess. The exact formula is in your State's tariff order: read your own schedule; the mechanics below are the common pattern, not your legal text.
| Situation | What the bill does | The fix |
|---|---|---|
| CD far above real MD for years | You pay demand charges (or the CD floor) for capacity you never touch | Apply for CD reduction after studying 12 months of MD data — seasonal peaks included |
| MD spikes past CD occasionally | Penal demand charges; possibly flagged for enhancement | Find the coincidence — which machines started together — and stagger them; consider a demand controller |
| MD rides close to CD monthly | No headroom for growth; every hiccup is a penalty risk | Peak-shave (staggering, soft starters/VFDs, BESS) or enhance CD deliberately, priced against penalties |
| kVA demand high while kW is modest | Poor power factor is inflating the very number you are billed on | Fix PF at the loads and the incomer — the cheapest demand reduction there is |
That last row is the perennial one: because demand is billed in kVA, every point of power factor you recover shrinks billing demand directly. Size the correction with our Power Factor Correction calculator.
ToD: the clock built into your tariff
Most State tariffs now price HT energy by time block — surcharges in evening/system-peak windows, rebates at night or in solar-rich hours; national tariff policy has pushed ToD toward near-universal application for commercial and industrial consumers. The blocks and percentages are State-specific and get revised — pull them from your current tariff order — but the optimisation logic is portable:
- Map your load profile against the blocks. Interval data from your meter (or a week of logging) shows exactly how much energy sits in surcharge windows.
- Move what moves cheaply: compressed-air top-ups, chilling/thermal storage, water pumping, batch starts, EV fleet charging — classic shiftable loads.
- Let solar rewrite the shape: rooftop solar removes daytime grid draw; with ToD rebates increasingly aligned to solar hours, the arbitrage math keeps improving. A battery that charges in cheap blocks (or from solar) and discharges into the evening surcharge is now a calculable investment rather than an exotic one.
- Re-check MD after shifting: load-shifting done carelessly stacks machines into a new coincident peak — optimise both numbers together.
A 90-day optimisation plan
- Days 1–30: collect interval data; identify MD-setting events and surcharge-window energy; verify your tariff order's demand formula and ToD blocks.
- Days 31–60: quick wins — PF correction tuned, interlocks/staggering on the coincident starters, obvious load shifts.
- Days 61–90: structural moves priced — CD revision application, demand controller, solar and/or BESS sized against the measured profile.
For the solar leg of the answer, start with the Solar Payback calculator; if evening peaks dominate, the Battery Storage calculator shows what shaving them takes.
What we do differently
Our electrical audit reads your last twelve bills and your meter's interval data before touching a single panel — so the report speaks in the DISCOM's own arithmetic: billing-demand drivers named, ToD exposure quantified, PF/CD/solar/BESS actions ranked by payback. Where a CD revision or metering correction needs filing, our liaison team handles the DISCOM paperwork too. One roof, from bill to hardware.
The three takeaways
- Billing demand is set by your worst half-hour — find the coincidence and break it.
- kVA billing makes power factor a demand-charge tool, not just a penalty-avoidance one.
- ToD blocks reward load-shifting, solar and storage — but only after you map your profile against your State's current order.
Twelve bills and one meter download — that's all we need to start. Book a Free Project Blueprint & Statutory Approvals Roadmap or call +91 70099 87817.
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