Estimate from the published tariff; your DISCO's bill is the figure that counts.
What changed on 9 February 2026
NEPRA's Prosumer Regulations 2026 (SRO 251(I)/2026) came into force that day and repealed the 2015 Net Metering Regulations. Under the old rules the meter netted units one for one: 500 units out cancelled 500 units in, whatever each was worth. Under net billing the two flows are settled separately. Regulation 14 bills every imported unit at your normal slab tariff, with FCA, QTA, duty and GST on top, and credits every exported unit at the national average energy purchase price. If the credit is bigger than the bill, the difference carries to next month or is paid quarterly.
Three more things changed. The agreement now runs 5 years from commissioning, renewable 5 at a time, where the old ones were 7. The system may not be larger than your sanctioned load. And NEPRA charges a one-time concurrence fee of Rs 1,000 per kW (Schedule-IV), so PKR 5,000 on a 5 kW system; since the August 2026 amendment (reported as SRO 1320(I)/2026, in some places 1330) systems of 25 kW or below are approved by the DISCO directly instead.
The first version of the regulations moved existing net-metering customers onto the new billing too. After a public outcry and a draft amendment in February, SRO 547(I)/2026 rewrote regulation 21(2): an agreement executed before 9 February 2026 keeps the rate and the mechanism of the 2015 regulations until its term expires. The saving ends if the facility is materially modified so that its maximum output changes.
What the export rate is
The regulations name it, the national average energy purchase price, and say NEPRA may revise it by notification mid-agreement (reg. 14(3)). They do not state a figure, and we could not find a NEPRA notification that does. What exists is NEPRA's own CY2026 power purchase price: an energy charge of Rs 924 billion for the year, which is Rs 8.13 per unit bought from generators or Rs 9.12 per unit sold to consumers. Dawn and most of the press report "about Rs 10 to 11". The old net metering paid surplus at the off-peak rate, reported at about Rs 26.
So the calculator lets you pick. Rs 8.13 is the default because it is the only figure with a NEPRA document behind it, and it is what the solar sizer and payback pages use too; Rs 11 is the figure in circulation. On the default month the gap between them is PKR 1,435.
How the old net metering is worked out here
Regulation 14 of the 2015 regulations nets the units. If you imported more than you exported, the net units are billed at the applicable tariff, so the slab is set by the net figure, not by the gross. If you exported more, the surplus is carried to the next billing cycle, and at the end of each quarter anything left is paid at the off-peak rate for your category, with no fixed charges, FCA or levies on it. Fixed charges and the TV fee on your own bill still apply, which is why a surplus month is not zero.
What this tool cannot know
- The export rate NEPRA will apply. It is not notified. Pick the case that worries you.
- How your DISCO carries a credit. The regulation allows credit to next month or quarterly payment; practice varies.
- Your real import figure. A bidirectional meter records in and out separately; the "units" on an old bill are net and will not work here.
- Protected status. Imports are billed on the unprotected residential tariff. A home with solar rarely qualifies for protected rates.
- Time-of-use. Three-phase TOU connections of 5 kW and above pay peak and off-peak rates; this uses the slab tariff.
Sources: NEPRA (Prosumer) Regulations, 2026 — S.R.O. 251(I)/2026, 9 February 2026 · S.R.O. 547(I)/2026 — amendment grandfathering pre-9 February agreements (K-Electric copy, dated 2 April 2026) · Business Recorder: Nepra ensures existing net metering rates to continue · Business Recorder: small-scale prosumers exempted from Nepra approval · NEPRA decision on the Federal Government motion, CY2026 uniform tariff · Dawn: Nepra pulls the plug on net-metering · NEPRA Net Metering Regulations, 2015 — S.R.O. 892(I)/2015 (K-Electric copy) · S.R.O. 279(I)/2026, 12 February 2026 — residential tariff used for the import charge · K-Electric: Net Billing (new connections)
