The short version: you never phone your old supplier to cancel. Sign up with the new one — MPRN or GPRN from a bill, a fresh meter reading, an IBAN — and they handle the switch through MRSO (electricity) and Gas Networks Ireland (gas). Supply is never interrupted. Allow 2–4 weeks.
Not sure who to switch to? Start with best energy in Ireland or the 30-second find your energy matcher. matched.ie is not a CRU-accredited comparison site — the accredited comparators are listed on cru.ie if you want a regulated tool.
How does switching energy supplier work in Ireland?
The thing that makes Irish energy switching painless is a piece of plumbing most people never see. Every electricity connection in the country has an MPRN — an 11-digit number starting with 10 — and every gas connection has a 7-digit GPRN. Those numbers belong to the address, not to you and not to your supplier. When you sign up with a new supplier, they lodge a change-of-supplier registration against that number: with MRSO (the Meter Registration System Operator, run within ESB Networks) for electricity, and with Gas Networks Ireland for gas.
That registration does everything. It tells your old supplier you are leaving, sets the date the accounts change over, and carries the meter reading that closes one bill and opens the next. You are not a messenger between two call centres, you do not serve notice, and you do not fill in a cancellation form. One sign-up, then wait.
The other thing the registration does not touch is the physical network. ESB Networks owns and operates the wires and meters no matter who bills you; Gas Networks Ireland owns the pipes. A switch changes the name on the bill and the rates per unit — nothing else. Nobody calls to the house, nothing is disconnected, and the supply never cuts, not even for a second.
One honesty note before the steps: matched.ie is not a CRU-accredited price-comparison or switching site. We rank the nine suppliers we have verified and we explain the process, but if you want an accredited comparator, the CRU publishes the list at cru.ie. The networks’ own consumer pages are at esbnetworks.ie and gasnetworksireland.ie.
What should I check before I switch?
Two things, in this order — both are about your current supplier, and both are cheaper than switching badly.
First, the contract end date and the exit fee. Nearly every new-customer deal in Ireland is a 12-month fixed term, and leaving inside it costs money: €50 per fuel at most big brands, €100 at Yuno and on SSE Airtricity’s fixed-rate plans, a flat €150 ex VAT at Pinergy — and €0 at Community Power, which has no fixed term at all. The full table is below. If your term has already ended, there is no fee and no reason to wait. Suppliers must show the contract end date on the bill; if you cannot find it, ask them.
Second, ask for a retention deal. Ring your current supplier, say you are about to switch, and ask what they can do. The worst case is a polite no; the common case is a re-sign discount that is not advertised anywhere. Judge the offer against the best new-customer deal on best energy in Ireland, not against the standard rate you are drifting on — and remember any retention deal is usually a fresh 12-month term with a fresh exit fee.
And whatever you compare, compare two years, not one. Most discounts die at month 12 and the bill snaps back to the standard rate — the year-2 cliff. A supplier that looks cheapest on the teaser can be mid-table once the discount lapses. That trap has its own page.
What do I need to switch energy supplier?
Everything on this list is either printed on a recent bill or standing in your hall. Nothing requires a phone call.
| Have ready | Where it is / why they ask |
|---|---|
| MPRN (electricity) | 11 digits, starts with 10, near the top of any electricity bill. Identifies the connection at your address — it never changes when you switch. |
| GPRN (gas) | 7 digits, on any gas bill. The gas equivalent of the MPRN. Dual-fuel switchers need both numbers. |
| A fresh meter reading per fuel | Closes the old account and opens the new one on the same number. Photograph the meter — it is your evidence if the final bill looks off. Smart meters can be read remotely. |
| IBAN | For the direct debit — most of the deepest discounts require direct debit and paperless billing. |
| Account-holder name and address | The account must be in your name to switch it. Renters whose landlord holds the account cannot switch it themselves. |
| Contract end date + exit fee (current supplier) | Shown on the bill / in the app. Decides whether switching today costs €0 or up to €150 per fuel. |
| Your annual kWh (optional but smart) | On the bill as annual consumption. Lets you judge deals on your real usage instead of the 4,200 kWh / 11,000 kWh typical figures. |
How do I switch, step by step?
- Check your contract end date and exit fee first. Inside a 12-month fixed term, leaving costs €0–€150 per fuel depending on the supplier. If the fee outweighs the first-year saving, wait — or pay it knowingly.
- Ask your current supplier for a retention deal. One call: “I’m switching unless you can do better.” Get any offer in writing and compare it against the best new-customer deal, not your current rate.
- Dig out a recent bill for each fuel. Note the MPRN (11 digits, starts with 10) and, for gas, the GPRN (7 digits). They identify the connection, not your account, so they never change.
- Take a meter reading the day you sign up. Photograph it. That read closes the old account and opens the new one, so nobody bills the same units twice.
- Sign up with the NEW supplier — and only the new supplier. MPRN/GPRN, meter reading, IBAN. They register the change with MRSO (electricity) and Gas Networks Ireland (gas). You never contact the old supplier to cancel.
- Wait 2–4 weeks. Most switches land in about 14 days, the slow ones in up to about 28. Supply never cuts — ESB Networks and Gas Networks Ireland keep running the wires and pipes throughout.
- Check the final bill and the first new bill line up. Closing read = opening read; credit refunded. You have 14 days to cancel the new contract if you change your mind — 30 days on some doorstep/off-premises sign-ups.
How long does switching take?
Two to four weeks end to end, and the honest average is nearer the two. Here is what actually happens on the clock — and note how little of it is yours to do.
| When | What happens | Who does it |
|---|---|---|
| Day 0 | You sign up: MPRN/GPRN, meter reading, IBAN. The 14-day cooling-off clock starts now. | You |
| Days 0–2 | The change-of-supplier registration is lodged against your MPRN with MRSO, and your GPRN with Gas Networks Ireland. | New supplier |
| Days 1–14 | Registration processes; the old supplier is notified through the system. This is when a debt flag (arrears of €225+, over 60 days) can pause things — and when the “please stay” call may come. | MRSO / GNI + old supplier |
| ~Day 14 | Supply transfers. Your meter reading (or a remote smart read) becomes the old supplier’s closing read and the new supplier’s opening read. Nothing at the house changes. | Both suppliers |
| Days 14–28 | Final bill from the old supplier — closing read, any exit fee, any credit refunded. Welcome pack and first billing cycle from the new one. | Old + new supplier |
| Up to ~Day 28 | The slower switches complete — usually ones where a read was queried or a flag had to be resolved. Still no interruption to supply. | MRSO / GNI |
Your total workload sits inside day 0: one bill, one photograph of a meter, one online form. Everything after that is other people’s software.
Will my electricity or gas be cut off when I switch?
No — and this deserves its own section because it is the fear that keeps people on expensive standard rates for years. Your supply is never interrupted by a switch. Not for an hour, not for a minute. There is no engineer visit, no disconnection, no reconnection and no gap between suppliers.
The reason is structural, not a promise: the companies competing for your bill do not own any wires. ESB Networks runs the electricity network and Gas Networks Ireland runs the gas network for every home in the state, whoever the supplier is. A switch is an administrative change in a registration database — the same electrons and the same gas keep arriving through the same meter.
The twin myth is that you must ring your old supplier to “cancel” — and that if you forget, you will be billed twice or cut off. Also false. The old supplier is told through MRSO or Gas Networks Ireland, the closing read is the line between the two bills, and there is nothing for you to cancel. The only call worth making to the old supplier is the retention call, and that happens before you switch, not after.
Can I change my mind after signing up?
The cooling-off window: you have 14 days from signing up to cancel the new energy contract without penalty — no exit fee, no reason needed. For some contracts signed at your door or away from the supplier’s premises, the Consumer Rights Act 2022 extends this to 30 days. Tell the new supplier in writing inside the window; if the supply has already transferred, you will simply pay their rates for the days you used.
Cooling-off undoes the new contract only. It does not resurrect a discount you already left behind, and it is not a way out of an exit fee already charged by the old supplier.
In practice the window means you can lock in a deal the day you see it, then keep comparing for a fortnight at zero risk. If a better offer turns up on day 6, cancel and take it. The clock starts when you conclude the contract — the confirmation email — not when the supply transfers, so on a typical ~14-day switch the window and the transfer land close together. If beating the deadline matters to you, count the days from the email.
What exit fee will I pay for leaving early?
Exit fees only bite if you leave a fixed-term plan before the term ends and outside the cooling-off window. At contract end you owe nothing — which is exactly when the discount dies and you should be switching anyway. Here is every supplier we track, worst case per fuel, from the terms we verified this week:
| Supplier | Exit fee (early exit) | The fine print |
|---|---|---|
| Pinergy | €150 ex VAT, flat | Steepest in the market: a flat €150 ex VAT early exit charge for residential connections (schedule effective from September 2025), and the T&Cs allow a separate meter removal charge inside the first 12 months. Verified on pinergy.ie this week. |
| Prepay Power | up to ~€135 elec · €50 gas | Electricity: €11.25 for every month (or part-month) left of the 12-month initial period — up to about €135 if you leave immediately after cooling-off. Gas: €50 cancellation fee. Both from the rate card checked 28 Aug 2026. |
| Yuno Energy | €100 per fuel | €100 termination fee per fuel if you leave after the 14-day cooling-off but before the 12-month initial period ends — or if you leave without giving 30 days notice. Dual fuel means two fuels, so up to €200. Checked in the product T&Cs on yunoenergy.ie on 28 Aug 2026. |
| SSE Airtricity | €100 fixed-rate · €50 discount plans | €50 per fuel on the standard discount plans and €100 per fuel on the fixed-rate plans (both per the current T&Cs, checked 28 Aug 2026). Dual fuel means two fees. No charge inside the cooling-off window. |
| Electric Ireland | €50 per fuel | €50 incl VAT per fuel if you leave a fixed-term plan early; nothing once the 12 months are up |
| Bord Gáis Energy | €50 | €50 early-exit fee on 12-month fixed-term plans (the plan terms word it per contract — dual-fuel customers should confirm in their welcome pack). No fee at contract end or inside the 14-day cooling-off. |
| Energia | €50 per fuel | €50 per fuel if you cancel after the 14-day cooling-off and before the fixed term ends (clause 13.4 of Energia’s domestic T&Cs) — €100 on dual fuel. Nothing to pay at contract end. |
| Flogas | €50 per fuel | €50 per fuel if you close the account within the first 12 months, outside the 14-day cooling-off period. The Standard Variable tariffs have no fixed term and no exit fee. |
| Community Power | €0 — no fixed term | None. There is no fixed term and no exit fee — Community Power advertises €0 to leave, and we verified that on communitypower.ie this week. You still owe for the units you used up to your closing read. |
The same numbers as a picture — the spread between the cheapest and dearest doors to close behind you is €150:
Two wrinkles worth naming. Prepay Power’s electricity fee is a countdown — €11.25 for every month left of the initial period, so it shrinks as the year runs down. And Yuno’s €100 also applies if you leave without giving 30 days’ notice, so time an exit there carefully. On dual fuel, remember most fees are per fuel: leaving an Energia or SSE Airtricity dual bundle mid-term means two fees, not one.
Can I switch if I owe my supplier money?
Small or recent balances are no obstacle — they simply appear on the final bill like any other month. The rule that can stop a domestic switch is specific: arrears of €225 or more that are more than 60 days overdue allow the old supplier to raise a debt flag against the change-of-supplier registration, which blocks or delays the move until the balance is dealt with.
Two useful corollaries. First, a previous tenant’s debt does not follow the address — the flag attaches to their account, not to the MPRN, so a new occupier switches freely regardless of what the last household left owing. Second, if you are in genuine arrears, switching is often still the right end goal, because arrears at a standard rate compound fastest — but sort a payment plan first. Suppliers must offer them, and MABS (the state money-advice service) is free and will negotiate on your behalf. Prepay meters from Prepay Power or Pinergy are one route people in arrears take for budget control — just go in knowing prepay rates carry a premium.
Where to next?
- Best energy in Ireland — the ranking, with year-1 and year-2 cost for every supplier.
- Find your energy — answer a few questions, get a shortlist in 30 seconds.
- Year 1 vs year 2 energy prices — why the teaser discount is not the price, and when to set the month-11 reminder.
- The reviews, if you have a shortlist: Electric Ireland, Bord Gáis Energy, SSE Airtricity, Energia, Yuno, Flogas, Prepay Power, Pinergy and Community Power.
