Net Metering in Pakistan: How Solar Export Credits Actually Work

Net metering is the single biggest reason a grid-tied solar system pays for itself — and the single most misunderstood line in most solar quotes. If you sell solar in Pakistan, getting this right is what separates a credible proposal from an optimistic guess.

What net metering actually does

Under a net-metering arrangement, a bi-directional meter records two things: the units you import from the grid and the units your system exports back to it. At the end of the billing cycle, your exported units offset your imported units. You are billed — or credited — on the net.

The key nuance is that import and export are often valued differently. Imported units are charged at the consumer slab tariff, while exported units are credited at a separate buyback rate. That asymmetry is exactly why a system should be sized to maximise self-consumption first and export second.

Why slab tariffs change everything

Pakistani electricity tariffs are tiered. The more you consume in a month, the higher the per-unit rate on the upper slabs. Because solar shaves consumption off the top of the bill first, the first units offset are usually your most expensive ones — which means savings are front-loaded and non-linear.

A flat “units × one tariff” estimate ignores this completely. It either over- or under-states savings, and customers notice when the first post-install bill doesn’t match the promise.

Sizing to real savings, not to the roof

A defensible recommendation balances three things:

• Self-consumption — the units the household uses while the sun is up, valued at the full slab rate.
• Export credit — surplus units sent to the grid, valued at the buyback rate.
• Roof capacity — the physical upper bound on how many panels can fit.

Size to the larger of the customer’s appliance load and their billed usage, cap it at what the roof can hold, and model the savings against the actual slabs. That is how you produce a number the customer can verify on their own bill.

The takeaway for installers

Net metering is a sales advantage only if your numbers are honest. Model slab tariffs and the export buyback separately, base the recommendation on real usage, and show the customer the before-and-after on their own bill. SolarStack does this automatically inside every quote — so your proposal is both faster to produce and easier to trust.