The short version: your supplier’s name is the logo on any electricity or gas bill, the app you top up or pay through, or a Payzone/top-up receipt. Nothing on paper? Ring ESB Networks on 1800 372 757 with your address and Eircode — they can confirm the supplier registered against your electricity connection (MPRN). For gas, Gas Networks Ireland on 1800 464 464 does the same for your GPRN. Both numbers checked on the operators’ sites, August 2026.
And no — ESB Networks is not your supplier, and neither is Gas Networks Ireland. They run the wires and pipes for everyone. The company that bills you is one of nine retailers.
Why don’t I know who my energy supplier is?
It sounds like a daft question until you count the ways it happens. You moved into a rental and the letting agent said “the electricity is on” and nothing else. You bought a house and the seller’s supplier kept the lights running while nobody told you a name. Your bills are e-billed to an email you stopped checking in 2021. The house came with a prepay meter and you have been feeding it top-ups without ever reading the branding. Or the account was set up decades ago, the direct debit just works, and the household shorthand for the bill has always been “the ESB”.
That last one is the giveaway that this page is needed. A large share of Irish households, asked who supplies their electricity, answer ESB — a company that, in the retail sense they mean, does not exist. Untangling that is worth two minutes, because the confusion has a real cost: people ring the wrong organisation to switch, to complain, or to chase a bill, and people who think they “have ESB” tend to assume they are on some default state tariff that cannot be shopped around. Every Irish household is with a competing retailer, and every one of them can switch.
Who actually does what in Irish energy?
Four kinds of organisation touch your energy, and only one of them ever competes for your money. Here is the map:
| Who | What they do | When you deal with them |
|---|---|---|
| Your supplier (retailer) — Electric Ireland, Bord Gáis Energy, SSE Airtricity, Energia, Yuno, Flogas, Prepay Power, Pinergy or Community Power | Buys wholesale energy and bills you for it. Sets your unit rate, standing charge, discount and contract. The only layer you can choose. | Bills, tariffs, direct debits, switching, moving the account into your name |
| ESB Networks (network operator, electricity) | Owns and runs the wires, poles and electricity meters for every home, whoever bills it. Keeps the register linking each MPRN to its current supplier. Sells nothing to households. | Power cuts, meter problems, new connections, finding your MPRN — or confirming which supplier is registered on it |
| Gas Networks Ireland (network operator, gas) | Owns and runs the gas pipes and meters for every connected home. Holds the GPRN register. Also sells nothing to households. | Gas emergencies (1800 20 50 50), meter and connection work, finding your GPRN — or the supplier on it |
| CRU (Commission for Regulation of Utilities) | The regulator. Licenses suppliers and network operators, sets consumer protections, accredits the official price-comparison sites. | Unresolved complaints after your supplier’s process; the accredited comparator list on cru.ie |
The design is deliberate: competition lives entirely in the top row. When you switch supplier, the bottom three rows do not change — same wires, same pipes, same meter, same regulator. That is why a switch never interrupts supply, and why the question “who is my supplier?” only ever has nine possible answers.
Why is “I’m with ESB” wrong?
The myth, retired: nobody in Ireland has “ESB” as their electricity supplier. ESB Networks operates the network for every single home and never sends a household a supply bill. The ESB Group’s retail company — the one that actually bills people — has traded as Electric Ireland since 2012. If your household “has always been with the ESB”, you are almost certainly an Electric Ireland customer, very possibly on a standard rate that has not been shopped since the meter was installed.
Gas has the same trap in different clothes: Gas Networks Ireland runs the pipes and is not a supplier, while Bord Gáis Energy — a separate, privately owned retailer — is one of several companies that might bill you for gas. Being connected by GNI tells you nothing about who your supplier is.
The practical trap this myth causes: ringing ESB Networks to switch, or to complain about a bill. They cannot do either — there is no tariff to move you to and no bill of theirs to argue about. Switching is done by signing up with the new retailer you choose (they register the change against your MPRN or GPRN; the full process is here), and billing rows belong with the supplier whose logo is on the bill. The one call ESB Networks can usefully take from a lost householder is the one this page is about: telling you which supplier that logo belongs to.
How do I find out who my supplier is — fast?
Start from whichever situation is yours and work down the list. Most people are done at step one.
| Your situation | Do this, in order |
|---|---|
| You have a bill (paper or PDF) | The logo and company name at the top is your supplier. Done. While it’s open, note the MPRN (11 digits, starts with 10) or GPRN (7 digits) and your contract end date — you’ll want all three to switch. |
| New tenant / just moved in | 1. Ask the landlord, agent or seller — they usually know. 2. Check the hall and meter cupboard for the previous occupier’s post: their bill names the supplier currently registered at the address. 3. Ring the network operators (routes below). Then get the account moved into your name — that’s a change of occupancy, not a switch. |
| No paperwork at all | Electricity: ring ESB Networks, 1800 372 757, with the address and Eircode. Gas: ring Gas Networks Ireland, 1800 464 464, with the address or Eircode and the meter serial number off the front of the meter. Each confirms the supplier registered on the connection. |
| Prepay (PAYG) meter | Read the branding on the meter or the in-home top-up unit — usually Prepay Power or Pinergy for electricity. Top-up receipts and the top-up app also name the supplier. A standard GNI pay-as-you-go gas meter can even show its own GPRN on screen 32 (“Ref”) — see find your GPRN. Unbranded meter? Fall back to the phone routes above. |
| Bills included in rent | The supplier is the landlord’s, on the landlord’s account — you can’t switch it and rarely need its name. If you’d rather pay your own way (and shop your own deal), ask for the account to be transferred to you first. |
How do I check my electricity supplier with ESB Networks?
ESB Networks is the authoritative source because the register of who supplies what physically lives with them: every change of supplier in the country is recorded against an MPRN in their systems. When there is no bill to read, that register is what you are really asking to see.
The route, as their site documents it in August 2026, is the phone: 1800 372 757, Monday–Friday 08:30–18:00, Saturday 08:30–13:30. Have the address and Eircode ready; the MPRN — or, failing that, the meter serial number printed on the front of the electricity meter — helps them pin the right connection if the address is ambiguous. They can confirm the supplier currently registered against it. Note there is no online self-service look-up for the supplier name: the Find My MPRN service inside a free ESB Networks online account retrieves the number itself, not the retailer on it, so for the supplier question you ring.
If you don’t yet know your MPRN either, sort that in the same call or read find your MPRN first — you will need the number for any switch or account set-up anyway, and it never changes when suppliers do.
How do I check my gas supplier with Gas Networks Ireland?
Same structure, different fuel. Gas Networks Ireland keeps the register tying every 7-digit GPRN to the supplier billing it, and their line — 1800 464 464, per gasnetworks.ie in August 2026 — can confirm both the GPRN and the supplier registered on it. They will want the registered name if known, the address or Eircode, and the meter serial number from the front of the gas meter, which proves you are asking about the right box.
Two gas-specific shortcuts before you dial. On pay-as-you-go, your Payzone top-up receipts carry the supplier’s name (and the GPRN). And any old bill found in the house works: the GPRN belongs to the property, and the supplier on the most recent bill is still the registered one until somebody changes it. The full number-hunting guide is at find your GPRN. One number to keep separate: 1800 20 50 50 is GNI’s 24-hour gas emergency line — smells of gas go there, supplier questions do not.
What if nobody supplies the house at all?
Possible, and worth catching early. A new build that has never had an account, or a property vacant long enough that the last account was closed, can sit with no supplier registered — the network operators will tell you so when you ring. Energy may still flow (electricity in particular is rarely physically disconnected between occupants), but unbilled is not free: once you register with a supplier, usage since move-in gets caught up, and an unregistered occupancy that drifts on eventually produces a catch-up bill at standard rates — the dearest way to buy energy.
The fix is the pleasant kind: with no incumbent contract, no exit fee and no debt attached to you (a previous occupant’s arrears belong to their account, not the address), you are the freest shopper in the market. Pick a supplier from best energy in Ireland, hand over the MPRN/GPRN and a meter reading, and the account opens in your name. If supply was actually disconnected, the supplier arranges reconnection through the network operator — the moving house guide covers that path and the readings to take on day one.
I know who my supplier is — now what?
Turn the name into money. In order:
- Find out what you’re paying. Dig out the unit rate, standing charge and contract end date — the electricity bill and gas bill explainers show where each line hides.
- Check whether you’re on a standard rate. If the household “has always been with the ESB”, odds are the discount died years ago and you’re paying the full standard rate — the year-1 vs year-2 page shows what that costs.
- Shop it. Our ranking shows year-1 and year-2 cost for the nine suppliers, and the find your energy matcher shortlists in 30 seconds. To be clear: matched.ie is not a CRU-accredited price-comparison site — the accredited comparators are listed on cru.ie if you want a regulated switching tool.
- Switch with the new supplier only. They register the change against your MPRN/GPRN; the old supplier is notified automatically and supply never blinks. Takes 2–4 weeks — the step-by-step is here. And not through ESB Networks or GNI: you now know exactly why.
Renters on a prepay meter the landlord fitted, or weighing top-ups against a monthly bill, should detour through prepay vs bill pay before switching anything. The operators’ own consumer pages, for completeness: esbnetworks.ie and gasnetworksireland.ie.
