Let me be straight with you, because most articles on this topic are not.
You cannot check an electricity bill online without a reference number. The entire billing system is indexed on it. There is no name search, no address search, no CNIC lookup that pulls up your bill instead. Anyone promising otherwise is wasting your time.
What you can do is get the number back. It is almost never genuinely lost, just misplaced, and there are more routes to it than people realise. Here they are, roughly in order of how quickly they work.
Check your payment app first
This is the one nearly everybody forgets, and it works more often than anything else on this list.
If you have ever paid your bill through JazzCash, Easypaisa, or your bank's app, that reference number is sitting in your transaction history. Open the app, go to your bill payment history or your saved billers list, and find an old electricity payment. The reference number is attached to it.
Same goes for internet banking. Utility payments are stored with the consumer number they were paid against, and most banks keep a saved biller entry once you have used it.
Thirty seconds, no phone calls, no queuing. Try this before anything else.
Look for any old bill at all
The number is identical on every bill for that connection, so any copy from any month works. Not just the most recent one.
Check the obvious places, then the less obvious ones. Old bills end up inside file folders with tenancy papers, in the drawer where guarantee cards live, stapled to bank account opening documents, and photographed on phones by people who forgot they did it. Search your own gallery for a picture of a bill. It happens more than you would think.
Ask a neighbour on the same meter batch
Reference numbers along a single street are usually issued in sequence, because the meters were installed around the same time.
That does not give you your number directly, but it gives the company something to work with. Take a neighbour's number to the helpline or the subdivision office and they can locate yours from the surrounding range far faster than from an address alone.
Ring the helpline
Most WAPDA-affiliated companies use 118. Have your CNIC ready, along with the connection address and the name the meter is registered in, which may be a landlord or a previous owner rather than you.
Be realistic about timing. In July, the helpline in a large city is not a quick call. Early morning tends to be better than evening.
Use your meter number
Every meter carries a serial number printed on its face. Note it down, along with the address, and take both to your subdivision office.
The counter staff can trace a connection from the meter number when other routes have failed. This is the method that works when the property changed hands, the previous owner's records are gone, and nobody remembers what was registered where.
Visit the subdivision office
Slower than everything above, but it works, and it is the fallback when the connection is disputed, the property has recently transferred, or the account is registered to someone who is no longer around.
Bring your CNIC, proof that you occupy the property such as a tenancy agreement or ownership papers, and the meter number if you have it. Ask them to print your reference number, then photograph it before you leave the building.
Ask whoever held the connection before you
Landlords, previous tenants and sellers usually have old bills or at least the number saved. A single message can save you a morning.
If you rent and your landlord handles the bills, ask for the reference number as a matter of course rather than waiting until you need it. You are entitled to know what you are paying for.
Once you have it, do not lose it again
Save the 14 digits in your phone notes, in a contact card, in a cloud document, wherever you will find it. Then check your bill on the electricity bill checker, or go directly to your company's page such as the IESCO bill page for Islamabad and Rawalpindi.
DB Center is Pakistan's No 1 SIM and CNIC details checker, and its bill tools sit on the same free platform. No login, no fee. If the page will not open, that is usually your internet provider filtering it, so switch on a free VPN like Proton VPN or Windscribe and try again.
While you are saving numbers, do the same for your gas connection. The gas bill tool works the same way and needs its own reference number, which is equally easy to lose.
Two things that will not work
Worth saying plainly so you do not waste an afternoon.
Searching by name or address on any online portal will not find your bill. The systems are not built that way, and the restriction is deliberate.
Third-party sites claiming to find a bill from a CNIC alone are not doing what they say. Consumer billing records are not openly searchable by identity, and a site promising otherwise is either guessing or after your data.
The short of it
There is no way around the reference number, but there are seven ways back to it. Check your payment app history first, because it works in under a minute and almost nobody thinks of it. After that, any old bill, a neighbour's number, the helpline, your meter serial, the subdivision office, or whoever held the connection before you. Then save it somewhere permanent so this is the last time.