Most people assume “peak hours” apply to every IESCO bill the moment they hear the term — and that’s usually where the confusion starts. If your connection runs on standard slab billing rather than a Time of Use meter, this whole schedule doesn’t touch your bill at all. I checked this against my own IESCO account and a handful of reader bills before writing this, because half the questions I get on this topic come from people who don’t actually have a TOU meter in the first place. IESCO Peak Hours & Off Peak Timings only matter once you’ve confirmed that distinction, so that’s where we’re starting.
It’s a distinction worth getting right before you change a single habit around the house. I’ve had readers tell me they started running their washing machine at midnight to “beat peak hours,” only to find their bill was calculated on ordinary slabs the whole time — no peak, no off-peak, no savings from the change at all. The rest of this page walks through who this actually applies to, exactly when the hours fall by season, and what genuinely moves the needle on your bill if you are on a TOU tariff.
What Are IESCO Peak Hours?
IESCO peak hours are the four-hour daily window — set by NEPRA, not by IESCO itself — during which electricity costs more per unit for consumers on a Time of Use (TOU) tariff. The exact clock hours shift with the season under NEPRA’s own tariff determination. IESCO simply bills according to whatever window NEPRA has notified; it doesn’t set the timing on its own.
That last point trips people up constantly. NEPRA (National Electric Power Regulatory Authority) is the federal body that reviews and approves electricity tariffs for every DISCO in the country, IESCO included, under the framework of the NEPRA Act 1997. IESCO’s job is distribution and billing execution — reading meters, generating invoices, running the customer portal — not deciding what the peak-hour rate or window should be. When people ask “why did IESCO change my rate,” the honest answer is almost always that NEPRA issued a new tariff determination and IESCO simply applied it. That’s a different complaint path than a billing error, and it’s worth knowing which one you’re actually dealing with before you call the helpline.
Do IESCO Peak Hours Apply to You?
Peak and off-peak timing only applies if your meter is registered under a TOU tariff, not standard slab billing. Most residential IESCO consumers under 300 units are still billed on the ordinary slab structure, where every unit costs the same regardless of when you use it — no peak, no off-peak, just total units consumed.
You can tell which one you’re on by checking your bill. A TOU bill splits your consumption into two separate line items — usually labeled “peak units” and “off-peak units” — with two different per-unit rates. A slab bill shows one consumption figure and one rate table by slab. If you don’t see that split, this schedule doesn’t currently affect what you pay, though it’s worth rechecking periodically — IESCO does convert some categories (commercial connections above a certain sanctioned load, larger residential connections) to TOU as tariff rules change.
Commercial and industrial connections work a little differently. Once a connection’s sanctioned load crosses into the higher brackets under IESCO’s A-2 (commercial) or B (industrial) categories, TOU metering becomes standard rather than optional, and the bill will also show a Maximum Demand Indicator (MDI) reading alongside the peak/off-peak split — a separate figure tracking the highest demand spike during the billing cycle, used for demand-based charges on larger connections. If you run a shop, workshop, or small factory under IESCO and you’re not sure which category your connection falls into, that MDI line on the bill is usually the giveaway that you’re on TOU whether you asked for it or not.
New connections add one more wrinkle worth knowing honestly: if you’ve just had a meter installed, the portal and even the physical bill may not reflect TOU or MDI data cleanly for the first 30–45 days while the account settles into IESCO’s billing cycle. Don’t read too much into a missing peak/off-peak split on your very first bill — check again after the second cycle before assuming something’s wrong.
IESCO Peak & Off-Peak Hours by Season
| Season | Months | Peak Hours | Off-Peak Hours |
|---|---|---|---|
| Winter | December – February | 5:00 PM – 9:00 PM | Remaining 20 hours |
| Spring | March – May | 6:00 PM – 10:00 PM | Remaining 20 hours |
| Summer | June – August | 7:00 PM – 11:00 PM | Remaining 20 hours |
| Autumn | September – November | 6:00 PM – 10:00 PM | Remaining 20 hours |
This schedule reflects NEPRA’s tariff determination for IESCO (Tariff Nos. TRF-607 & TRF-608). Peak hours run four hours a day, every day, and they don’t repeat at the same clock time year-round — the window moves earlier in winter and later in summer as daylight and demand patterns shift.
The logic behind the shift is straightforward once you see it laid out: in summer, people run air conditioners well into the late evening, so the peak window is pushed later, 7–11 PM, to match when the grid is genuinely under the most strain. In winter, demand peaks earlier — heaters and lighting kick in right after sunset, which lands earlier in the day — so the window moves up to 5–9 PM. Spring and autumn sit in between, both landing on the same 6–10 PM window since demand patterns in those transitional months look similar. NEPRA revisits DISCO tariffs periodically, so treat this table as accurate as of September 2026 and cross-check it against IESCO’s current tariff notice before making decisions tied to a specific billing month.
How the Daylight Saving Time Adjustment Works
NEPRA’s own tariff order includes a line most guides skip entirely: peak and off-peak timings are to be duly adjusted in case of Daylight Saving Time. Pakistan hasn’t observed DST nationally in recent years, so in practice this clause sits dormant — but it’s written into the same determination that sets the hours above, and if DST is reintroduced for any season, your TOU meter’s peak window would shift with it automatically rather than staying fixed to standard clock time.
The practical reason this clause exists is that TOU meters run on programmed clock schedules, not manual switches — so if the country’s clocks move, the tariff authority needs a built-in instruction for how the billing window moves with them. It’s a small detail, but it’s also the clearest sign this schedule comes from an actual regulatory document rather than a rounded-off estimate.
Peak vs. Off-Peak Rate Difference
On a TOU tariff, off-peak units are billed at a lower per-unit rate than peak units — that part is consistent across every consumer category IESCO serves. What isn’t consistent is the actual rupee gap between the two: it depends on your consumer category (A-1 residential, A-2 commercial, or the industrial B categories), your slab, and whichever NEPRA determination is currently in force, since these figures get revised more often than the peak-hour timing itself.
| Tariff Component | Peak Rate | Off-Peak Rate | Note |
|---|---|---|---|
| Per-unit energy charge | Higher | Lower | Varies by consumer category and current NEPRA notification |
| Fuel Price Adjustment (FPA) | Applied on top of base rate | Applied on top of base rate | A monthly pass-through adjustment for fuel cost changes, not fixed |
| TR Surcharge | May apply per category | May apply per category | A separate regulatory surcharge line, distinct from the energy charge |
Note: Exact rupee figures aren’t quoted here on purpose — they shift with each NEPRA revision, and printing a specific number risks being wrong within a month. Check your own bill’s tariff card or IESCO’s current tariff rate page for the figure that applies to your category right now.
Two charges worth naming specifically, because they show up on almost every TOU bill and confuse people who’ve never had them explained: the Fuel Price Adjustment (FPA) is a monthly pass-through charge reflecting the difference between the fuel cost NEPRA originally estimated and the actual fuel cost incurred generating that month’s electricity — it can go up or down depending on fuel prices, and it applies on top of whatever peak or off-peak rate you were billed at. The TR Surcharge is a separate regulatory line item that applies to certain consumer categories regardless of the time-of-use split. Neither of these is unique to TOU billing, but they land differently on a TOU bill because they’re calculated against a higher base rate during peak hours than off-peak hours.
One more honest note: whether your household falls into the “protected” or “non-protected” residential category also affects your base rate, separately from the peak/off-peak split — protected-category consumers (generally lower consumption bands) are billed at subsidized rates, and that subsidy interacts with TOU pricing in ways that aren’t identical to how it works on slab billing. If your monthly consumption hovers right around the protected-category threshold, it’s worth watching that line on your bill specifically rather than assuming the peak/off-peak gap alone explains a jump in cost.
How to Check Your Own Peak vs. Off-Peak Units
- Pull up your latest bill using your 14-digit Reference Number on the online bill-check portal, which runs on infrastructure operated by PITC (Pakistan Information Technology Company) on IESCO’s behalf.
- Look for the consumption breakdown section. On a TOU bill, this shows two separate unit counts — one for peak hours, one for off-peak — not a single combined total.
- Cross-check against your meter display, if you have a digital TOU meter. Pressing the display button usually cycles through total kWh, then peak units, then off-peak units.
- Compare two or three months side by side. A sudden jump in peak units, with off-peak usage staying flat, usually means a routine or appliance schedule shifted — not a meter fault.
- Note your billing cycle length. IESCO bills run on a roughly monthly cycle, but the exact reading date shifts slightly month to month depending on your feeder’s meter-reading schedule — so don’t expect the peak-hour window on your bill to line up perfectly with calendar month boundaries.
One honest limitation here: not every TOU bill formats this breakdown clearly, and the online portal occasionally lags behind the physical meter reading by a day or two right after billing generation. If your bill and meter numbers don’t match closely, wait for the next cycle before assuming something’s wrong. And if you’ve just moved into a property with an existing TOU connection, ask the previous occupant or your SDO office to confirm the tariff category directly — the portal’s category label isn’t always updated the same day ownership or tenancy changes.
Simple Ways to Cut Cost by Shifting Usage
- Water pump and geyser — both draw heavy, sustained load; running either during peak hours adds up fast on a TOU bill. Shift to early morning or late night, when the same appliance costs less to run for the same duration.
- Washing machine — a single peak-hour cycle can cost noticeably more than the same cycle run off-peak; there’s no reason to run it right after dinner if you’re on TOU. Most machines have a delay-start function that makes this a one-time setup, not a nightly habit to remember.
- Iron — short duration, but stacking it with AC and geyser use in the same evening window compounds your peak-hour draw. Ironing earlier in the day, or right after off-peak begins, avoids that overlap.
- Air conditioner — the single biggest peak-hour cost driver for most TOU households in summer, since it’s the heaviest continuous load in the house during exactly the hours NEPRA has priced highest. Even shifting the pre-cooling period earlier, before peak starts, reduces the load caught in the expensive window — cool the room down before 7 PM in summer rather than after.
- Motor-driven appliances generally — anything with a compressor or motor (fridge cycling aside, since that’s unavoidable) pulls more current at startup than during steady running, so avoid starting multiple heavy appliances back-to-back right at the start of peak hours if you can stagger them instead.
If you want a rough sense of what shifting a specific appliance’s schedule could save before you commit to changing your routine, the IESCO bill calculator is a faster way to estimate it than doing the math by hand.
What Happens If You Ignore the Peak/Off-Peak Split Entirely
Nothing happens immediately — IESCO doesn’t penalize you for running appliances during peak hours, and there’s no separate “peak violation” charge beyond the higher per-unit rate itself. The real cost is cumulative: a household that runs its heaviest appliances inside the peak window every day, without shifting anything, ends up paying the peak rate on a large share of its total units, month after month, purely because nobody looked at the schedule once.
This is also where a lot of billing disputes start that have nothing to do with an actual meter or portal error. A consumer sees a bill jump, assumes it’s a mistake, and files a complaint — when the real cause was a routine shift (a new AC unit, a work-from-home schedule change, an extra household member) that pushed more usage into the priced-higher window. Checking the peak/off-peak split on your bill before assuming there’s an error saves a round trip to the SDO office in a lot of cases.
FAQs
What are IESCO peak hours?
They’re the four-hour daily window, set by NEPRA and applied through IESCO’s billing, during which TOU-metered consumers pay a higher per-unit rate. The window shifts seasonally rather than staying fixed year-round, and it has no effect on a standard slab-billed connection.
How many hours a day are IESCO peak hours?
Four hours, every day, regardless of season. What changes is the clock time — 5–9 PM in winter, 6–10 PM in spring and autumn, and 7–11 PM in summer, per NEPRA’s current determination.
Do IESCO peak hours apply to me if I don’t have a smart meter?
No. If you’re billed on the standard slab structure rather than a Time of Use tariff, peak and off-peak timing has no effect on your bill at all — you’re paying the same per-unit rate no matter when you use electricity.
Who sets IESCO’s peak hour timings — IESCO or NEPRA?
NEPRA sets them, through its tariff determination for IESCO under the NEPRA Act 1997. IESCO applies the schedule NEPRA notifies and handles the billing execution; it doesn’t set the hours or rates independently.
Do IESCO peak hours change with Daylight Saving Time?
Per NEPRA’s own tariff order, yes — the timings are to be adjusted for DST if it’s in effect. Pakistan currently isn’t observing DST nationally, so this clause isn’t active in practice right now, but it remains part of the official schedule.
Are IESCO peak hours the same for commercial and industrial consumers?
The clock-time windows are the same across categories. What differs is the tariff category and rate applied within those hours — commercial (A-2) and industrial (B) TOU rates aren’t identical to residential (A-1) rates, and larger connections also carry a separate Maximum Demand Indicator charge.
What’s the difference between IESCO’s per-unit peak and off-peak rate?
Off-peak is always cheaper than peak on a TOU tariff, but the exact rupee difference depends on your consumer category and the current NEPRA-notified rate. Check your bill’s tariff card or IESCO’s tariff rate page for the figure that applies to you right now, since it changes with each NEPRA revision.
Can I switch off TOU billing back to a flat rate?
This isn’t something you can typically request as a simple switch — TOU status is generally tied to your connection’s category and sanctioned load under NEPRA’s rules, not a preference you toggle. If you believe your connection was moved to TOU incorrectly, raise it directly with your local SDO office rather than assuming it’s reversible through the portal.
Where can I see my own peak vs. off-peak usage split?
On your bill’s consumption breakdown section, which lists peak and off-peak units separately, and on your physical meter’s display if it’s a digital TOU meter. Both methods are covered step by step in the article’s walkthrough.
Do IESCO peak hours differ from K-Electric’s?
Yes — K-Electric sets its own TOU schedule separately from the ex-WAPDA DISCO framework IESCO follows under NEPRA’s PITC-administered tariff structure, so the clock times aren’t identical between the two, even though both run on the same basic peak/off-peak principle.
If you’re checking your actual bill to see whether you’re even on a TOU tariff, the IESCO bill check portal will show you the consumption breakdown directly by Reference Number. For the current per-unit figures behind this schedule, the IESCO tariff rate guide has the fuller rate structure by category. And if your bill’s peak/off-peak split looks wrong, IESCO’s complaint helpline — 118, or SMS to 8118 — is the direct route rather than guessing.
