MD Penalty and Excess Demand Charge, Explained

What maximum demand actually measures

Units (kWh) measure how much energy you used over a month. Maximum demand measures the highest rate you drew it at — the worst single interval in the cycle, almost always a rolling 30-minute block, recorded by the meter and reset each cycle.

The distinction is the whole point. Running a 10 kW load for 20 hours and a 40 kW load for 5 hours can produce a similar unit count, but the second one forces the network to be built for 40 kW. Demand charges pay for that capacity; energy charges pay for the electricity.

So one bad half-hour sets your MD for the entire month. A compressor, a lift motor and an air-conditioning bank all starting together at 9:05 a.m. on one Monday is enough. Nothing you do for the remaining 719 hours brings that number back down.

Sanctioned load, contract demand and billed demand

Three numbers get confused constantly, and the penalty depends on which is which:

The penalty triggers on recorded MD above sanctioned load or contract demand. The billing-demand floor is a separate rule and works the other way: it stops your demand charge falling below a minimum, which is why a month with almost no usage can still carry a substantial demand charge.

How the penalty is calculated

Every Indian formulation reduces to the same shape:

Penalty = (recorded MD − sanctioned demand) × penal rate

What differs between states is only the penal rate, and there are four ways it is expressed:

• A multiple of the normal demand rate. The most common. The excess kW or kVA is billed at, say, 1.5× or 2× what a normal unit of demand costs.
• A flat ₹ per excess kVA. A fixed penal figure per unit of excess, independent of your ordinary demand rate.
• A percentage of energy charges per excess kW. Unusual, and it means the penalty scales with your consumption as well as your overshoot.
• A surcharge on the fixed charge for the excess load, rather than on the demand rate.

Two details decide whether the number on your bill matches your arithmetic. First, the penalty applies only to the excess — the portion up to your sanctioned load is billed normally. Second, in most states the penalty lands before the fuel surcharge and electricity duty are computed, so ₹1,000 of penalty costs more than ₹1,000 by the time the bill totals. Our bill calculator applies it in that order.

MD penalty rules by state

Generated from the same tariff data the calculator runs on, so it cannot drift away from what the site actually charges.

Every figure is computed by the calculator, not restated here. Each row probes a real bill at one kW over the example load, so the "each excess kW costs" column is what you would actually be charged on that tariff. The demand charge column is there because the penalty is usually a multiple of it — which is why the same state can show different penalties on different tariffs.

Why it appeared this month when nothing changed

The usual causes, in rough order of how often they turn out to be the answer:

1. One new load, switched on at the wrong moment. A single added motor or AC that happens to start while everything else is running sets a new peak.
2. Nothing changed — the season did. Cooling load in summer and heating in winter push simultaneous demand up without changing your habits.
3. A power cut and the restart after it. When supply returns, every thermostatic load in the building starts at once. This is one of the most common causes of a one-off MD spike, and it is not really your doing.
4. Your sanctioned load was always too low. Common on connections that were sized years ago and never revised. It is not a spike; you have been over the line for a while and are only now being charged for it.
5. Capacitor bank failure on a kVA tariff. If you are billed on kVA and your power factor collapses, recorded demand rises even though the actual work done did not. Worth checking before assuming the load grew.

The three ways to make it stop

In the order most people should try them:

1. Stagger the starts. The cheapest fix, and often enough on its own. If the penalty comes from three loads starting together, sequencing them by a few minutes removes the peak without reducing anything you actually use. A time switch on the largest motor costs a fraction of one month's penalty.
2. Fix the power factor, if you are on a kVA tariff. Correcting a poor power factor lowers recorded kVA demand directly, and in many states also earns a power-factor incentive — so it can pay twice.
3. Raise the sanctioned load. The right answer when the overshoot is structural rather than occasional. It is not free: a higher sanctioned load means a higher fixed or demand charge every month, forever. Compare that increase against what the penalty is actually costing you before applying — our sanctioned load optimizer does that comparison.

Raising the load first is the common mistake. If the penalty appears in two months out of twelve, a permanent fixed-charge increase can cost more per year than the penalty did.

Checking the charge on your own bill

1. Find your sanctioned load or contract demand on the bill, and confirm it matches your agreement. A clerical error here is worth ruling out first.
2. Find recorded MD — usually labelled MD, Max Demand or Rec. Demand, in kW or kVA.
3. Subtract. If recorded MD is at or below sanctioned, there should be no penalty line at all.
4. Multiply the excess by the penal rate from the table above, and compare with the line on the bill.
5. Check the units. A penalty computed in kW against a limit stated in kVA (or the reverse) is a real and recurring billing error, and on a poor power factor the gap between the two is large.

If your arithmetic and the bill disagree, that is worth raising — upload the bill and we will recompute it from the tariff.

Frequently asked questions