Pakistan's electricity slab system charges progressively higher rates for higher monthly consumption — crossing into a higher slab raises the rate only for the units above the threshold, not for all units consumed.
Understand How the Slab System Works
Pakistan's electricity pricing uses a block/slab tariff — a structure where the per-unit price increases as your monthly consumption rises. This isn't like a simple tiered system where only the extra units cost more; in Pakistan's residential tariff, crossing a slab threshold changes the rate for all your units, not just the ones above the threshold.
This is the single most important thing to understand about your electricity bill. If you consume 299 units, you pay a low per-unit rate on all 299. If you consume 301 units — just 2 more — all 301 units are billed at the higher slab rate. The jump in your bill at these thresholds is non-linear and can be jarring.
The slabs are determined by NEPRA and updated through the annual tariff revision process. The key thresholds for residential consumers are currently at 50, 100, 200, 300, 500, and 700 units per month.
Learn the Current NEPRA Residential Slab Rates
NEPRA's residential tariff slabs as of the most recent revision (verify current rates at nepra.org.pk as these are updated annually):
| Monthly Units | Tariff Category | Rate (approx.) | Key Note |
|---|---|---|---|
| 1–50 | Protected (lifeline) | Rs. 3–4/unit | Lowest-income subsidy tier |
| 1–100 | Protected residential | Rs. 7–9/unit | Under 300 units/month, no AC |
| 101–200 | Protected residential | Rs. 10–13/unit | Still on protected rate |
| 201–300 | Protected residential | Rs. 16–19/unit | Last protected slab |
| 1–700 (all) | Non-protected | Rs. 26–30/unit | Crosses 300 units or has AC |
| 701+ (all) | Non-protected upper | Rs. 35–40/unit | All units at highest rate |
Note: All rates exclude FPA, QTA, taxes, and surcharges. Verify current exact figures at nepra.org.pk — tariffs are revised annually, typically in July or August.
Understand the Protected vs Non-Protected Threshold
The most impactful slab transition happens at 300 units per month. Below 300 units (and without an air conditioner on your connection), you're a Protected Consumer and benefit from the lower slab rates. Above 300 units — or if you've an AC regardless of consumption — you become a Non-Protected Consumer and all your units are charged at the significantly higher non-protected rate.
Let's make this concrete with rough numbers. A consumer using 290 units in a month might pay approximately Rs. 3,500–4,500 at protected rates. A consumer using 310 units — just 20 more — might pay Rs. 9,000–10,000 because all 310 units now fall under non-protected pricing. The difference isn't 20 units' worth of electricity; it's the entire bill recalculated at a different rate structure.
This is why managing your consumption to stay just under key thresholds — if practically possible — can save thousands of rupees per month. Our electricity bill calculator lets you model this precisely for your situation.
Practical Strategies to Stay in a Lower Slab
A few adjustments make a measurable difference in which slab you land in:
AC temperature management: Raising your AC thermostat from 20°C to 24°C can reduce AC power consumption by 25–30%. On a hot day, that's the difference between 8 and 6 hours of AC effectively — dozens of units saved over a month.
LED lighting throughout the home: Replacing 10 incandescent or CFL bulbs with LEDs saves approximately 50–70W continuously. Over 30 days at 8 hours/day, that's 12–17 units saved just from lighting.
Inverter vs non-inverter AC: An inverter AC uses 30–50% less electricity than a conventional (non-inverter) unit of the same tonnage for the same cooling output. For households consuming 400+ units in summer, upgrading to an inverter AC is often the single most impactful change possible.
Time-of-use awareness: Some DISCOs have time-of-use tariffs for certain consumers — using heavy appliances at night when grid load is lower can reduce charges. Check with your DISCO whether your connection qualifies.
Understanding Your Bill — Common Questions and Solutions
Check the FPA and QTA charges — these are applied on top of slab rates and can add significant amounts independently of your consumption tier. Also check whether you were estimated last month and corrected this month, which would push your billed units higher.
This can happen at slab boundaries — if you were at 350 units (non-protected) and dropped to 300, you've crossed back into protected territory and should see a large bill reduction. If you dropped from 350 to 300 but are still above 300 (say, 305 units), you're still in non-protected territory.
If your billed units exceed 300 in any single month, you automatically move to non-protected rates for that month regardless of whether you've AC. Some DISCOs also check for AC based on meter inspection records — if an old AC connection exists, it may still flag your account as non-protected.
Different DISCOs have slightly different approved tariff rates within the same slab structure. If you're both on the same DISCO, verify you're both in the same tariff category (residential protected vs non-protected). Tariff category errors are correctable.
Frequently Asked Questions
Significantly different. At 299 units, you stay in protected tariff for all units. At 301 units, all 301 units are billed at non-protected rates — which are roughly 2–3x the protected rates. The difference for just 2 extra units can be Rs. 4,000–6,000 depending on your area. Our electricity bill calculator can model this exactly.
Yes — each monthly billing cycle is evaluated independently. Consuming 400 units in July doesn't affect your August classification. If you consume under 300 units in August, you're back to protected rates for that month.
Commercial and industrial tariffs in Pakistan are structured differently — they typically use a combination of demand charges (kVA-based), energy charges, and time-of-use rates rather than the consumption slab structure used for residential consumers.
Visit nepra.org.pk and look under 'Tariff Determinations' for the most recent tariff order for your DISCO. The approved schedule of tariffs is published with effective dates. The rates change annually — usually in July/August after the annual tariff determination.
Yes — with net metering, only your net imported units (consumed minus exported) are counted for slab purposes. Effective solar self-consumption can push you into a lower slab or even protected territory, saving both on the base tariff and on FPA charges.