The 200-Unit Trap: How MEPCO's Slab System Actually Works (And How to Stay Ahead of It)

Let's actually walk through how the slab system works, why 200 units is such a hard line, and what you can do about it.

What is a "slab" anyway?

Pakistan's domestic electricity tariff doesn't charge one flat rate per unit. Instead, your consumption is broken into blocks — slabs — and each block is charged at a different rate. This is standard practice internationally: it's meant to keep essential low-level consumption cheap while charging more for higher usage.

For protected consumers (2026 rates):

For unprotected consumers:

If slabs worked purely progressively — the way income tax brackets work, where only the amount above each threshold gets the higher rate — this wouldn't be nearly as brutal a system. But that's not how MEPCO's domestic tariff functions.

The actual trap: it's not progressive, it's categorical

Here's the part that catches people off guard. Your protected or unprotected status isn't determined unit by unit within a single bill — it's determined by your 6-month rolling average consumption. If that average stays at or below 200 units, the entire connection is billed at protected rates. The instant your consumption in any single month exceeds 200 units, the whole connection flips to unprotected — and stays that way for the following six billing cycles, regardless of how low your usage drops in the meantime.

This means the practical difference between using 198 units and 205 units isn't 7 units' worth of extra cost. It's the difference between paying protected rates on your entire bill and paying unprotected rates on your entire bill.

Concrete example:

A five-unit difference — roughly what one extra hour of AC per day for a week adds up to — nearly doubles your energy charge, and that's before FPA, GST, and surcharges are layered on top, which typically add another 40 to 50 percent.

Why does the system work this way?

The protected-consumer category exists as a targeted subsidy — the federal government compensates DISCOs for the difference between the subsidized rate and the actual cost of supply, aimed specifically at lower-consumption households. The 200-unit line is the policy's way of drawing a clear boundary: below it, you're treated as a modest-usage household deserving support; above it, even briefly, you're treated as capable of paying market rates. It's a blunt instrument, but it's a deliberate one, not a glitch.

How to know exactly where you stand

Your protected/unprotected classification is printed directly on your bill under the "Category" or "Tariff" field. But the more useful exercise is calculating your own rolling average before it becomes a problem:

1. Pull your last six months of consumption from your bill history.
2. Add the six figures together and divide by six.
3. If the result is at or below 200, you're currently safe — but check how close you are, and whether any single month is trending upward.

Worked example:
180, 195, 210, 175, 190, 185 → total 1,135 → average 189.2

This household stays protected despite one 210-unit spike, because the average still clears the line. But it's close enough that another warm month could tip the balance.

Practical ways to stay under the line

If you're hovering near 200 units — especially heading into summer — a few adjustments genuinely matter:

• Track your meter mid-cycle, not just at bill time. If you're at 150 units by day 20 of a roughly 30-day cycle, you have a rough sense of your pace and can adjust before it's too late.
• Push heavy loads to off-peak hours. This doesn't change total units, but it does make it easier to consciously limit AC and geyser runtime when you're watching the number closely.
• Set the AC to 26°C instead of 20°C. Each degree lower can add 6 to 10% more consumption — across a month, that's a meaningful chunk of your headroom.
• Skip the geyser in summer where you can. A single geyser cycle uses roughly 2 units; daily use across a month adds up to 40-60 units on its own.
• Swap remaining incandescent bulbs for LEDs. Ten old 100W bulbs running 8 hours daily add roughly 212 units a month; the LED equivalent adds about 25.

Run your actual numbers through the bill calculator before month-end — seeing the difference between 195 and 205 units in rupees, not just abstractly, tends to be the thing that actually changes behavior.

What if I already crossed the line?

There's no way to undo a month that's already billed — but the six-month unprotected period isn't permanent. Once six consecutive months roll by with your average back at or below 200, you automatically return to protected status; no application needed. The practical move in the meantime is simply to keep consumption as low as reasonably possible during that window, since you're already paying the higher rate regardless of how far under 700 you stay.

Frequently Asked Questions

Does crossing 200 units just once really affect six months of bills?
Yes. The unprotected classification applies for the six billing cycles following the month you crossed the threshold, regardless of your usage in those subsequent months.

Is the 200-unit rule the same for every DISCO in Pakistan, or specific to MEPCO?
It's a national NEPRA policy applied uniformly across all distribution companies — MEPCO, LESCO, IESCO, and the rest all use the same threshold.

If my average is under 200 but one month spiked to 210, am I still protected?
Your classification is based on the 6-month rolling average, but a single month exceeding 200 units is generally what triggers the reclassification for that connection, separate from the average calculation itself — this is the part that surprises people most, so if you're close to the line, treat every individual month as the one that matters, not just the average.

Can I apply to stay protected even if I go over 200 units occasionally?
No — there's no manual override or appeal for this specific rule. The only path back to protected status is six consecutive months at or below the threshold.

Does the 200-unit rule apply to commercial or industrial connections?
No, it's specific to domestic residential (Tariff A-1) connections. Commercial, industrial, and agricultural tariffs have entirely different structures.

What's the fastest way to check if I'm close to the line this month?
Read your physical meter mid-cycle and compare it against your last bill's reading — if you're on pace to exceed 200 units by the billing date, that's your signal to cut back before the cycle closes.

Last updated: August 2026
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