Sanctioned load is the ceiling nobody checks until sanction

A customer wants 6 kW. The roof takes 6 kW. The bill supports 6 kW. The application comes back sanctioned at 3 kW.

Nobody looked at the sanctioned load.

What it is, and why the DISCOM cares

Sanctioned load is the maximum electrical load your customer's connection is contracted to draw, agreed when the connection was given and rarely revisited since. On a domestic bill it is usually printed in kW. On a commercial or industrial bill you will also see contract demand, stated in kVA, which is the same idea with a different unit and a different tariff consequence.

Most DISCOMs will not sanction rooftop solar above that figure, and several tie the net metering approval to it directly. The reasoning is straightforward from their side: the service line, the meter and the share of the distribution transformer were all sized for that load, and a larger system pushes more current back through the same infrastructure.

The practical effect for you is that sanctioned load, not roof area, is frequently the real cap on system size.

Reading it off the bill

It is on the bill, usually near the consumer number and the tariff category, and it is easy to miss because it does not change month to month.

Three things to note while you are there:

• The figure itself, in kW or kVA.
• The phase. A single phase connection at 3 or 4 kW is common in older residential areas and is a hard limit on what you can install without an upgrade.
• The tariff category. Domestic, commercial, industrial or agricultural, because enhancement costs and rules differ by category.

If the customer's consumption looks like a 5 kW system but their sanctioned load says 3 kW, you have found the project's critical path before you have climbed onto the roof. Sizing from the bill generally is covered in sizing a system from the customer's electricity bill.

What enhancement involves

The shape is the same across most utilities, though the specifics vary:

1. An application to the DISCOM for a higher sanctioned load or contract demand.
2. A fee and a security deposit, generally scaled to the additional load.
3. A technical check: whether the existing service cable, meter and transformer can carry it. Sometimes they cannot, and then the utility has to change the service line or the meter.
4. A new sanction letter with the revised figure, which is what your net metering application then references.

Timelines run from a fortnight to considerably longer, depending on whether hardware has to change. When the local transformer is already loaded, this can turn into a much bigger conversation than the customer expects.

The three honest options

When sanctioned load is the constraint, there are three answers and you should present all three.

Size to the existing load. Often the right call. A 3 kW system on a 3 kW connection needs no enhancement, no extra fee and no delay, and for a household consuming 350 units a month it may cover most of the bill anyway.

Enhance first, then install. Right when the customer genuinely has the load, for example after adding air conditioning, and when the extra generation justifies both the fee and the ongoing fixed charge. Sequence it properly: enhancement first, solar application second. Running both together is how applications get rejected for mismatched capacity.

Split the difference. Enhance to the level that makes sense for their consumption rather than to the maximum the roof could carry. The roof is not the objective, the bill is.

Where EPCs lose money on this

By finding out late.

The cost of catching it at the site visit is one question. The cost of catching it at sanction is a rejected or reduced approval, a revised design, a second customer conversation about money and time, and sometimes modules already ordered against a capacity that will not be approved.

That is also why it belongs on your site visit checklist rather than in your head. The other blockers that sit alongside it are in the net metering application, end to end.

The short version

• Sanctioned load, not roof area, is often the real cap on system size. Most DISCOMs will not sanction above it.
• It is on the bill, alongside the phase and the tariff category. Read all three.
• Enhancement means an application, a fee, a deposit and sometimes a service line or meter change. It takes weeks.
• It also raises fixed charges permanently, and for commercial consumers the demand charge. Say so before they apply.
• Three honest options: size to the existing load, enhance first, or enhance partially. Present all three.
• Catch it at the site visit. Catching it at sanction costs a redesign and a difficult conversation.