The short answer: nothing breaks, nothing stops, nobody calls to the house. A switch is a paperwork change in a registration system. You’ll get a welcome letter from the new supplier, a meter reading will close one account and open the other, the old supplier will send a final bill (pay it), and the new rates start on the day the switch completes — usually two to four weeks after you sign up.
This page is the what and the why nothing breaks. For the step-by-step, see how to switch energy supplier; for the day-by-day clock, see how long a switch takes.
Why can’t switching cut off my electricity or gas?
Because the companies competing for your bill do not own any of the equipment that supplies your home. This is the single most useful fact in the Irish energy market, and it is worth spelling out slowly.
ESB Networks owns and operates the electricity wires, poles, substations and meters for every home in the country. Gas Networks Ireland owns and operates the gas pipes. Neither of them sells you energy, neither of them cares whose logo is on your bill, and neither of them changes anything when you switch. The suppliers — Electric Ireland, Bord Gáis Energy, Energia, SSE Airtricity, Yuno and the rest — are retailers. They buy energy wholesale, bill you for what the meter records, and answer the phone. That is the whole job.
So when you move from one supplier to another, the physical world does not participate. No engineer is dispatched. No fuse is pulled. No valve is turned. The registration that identifies your connection — the MPRN for electricity (11 digits, starting with 10) or the GPRN for gas (7 digits) — is simply re-pointed at a different retailer in the industry’s central systems. The electrons and the gas never notice.
The fear of disconnection is understandable — it is the worst-case scenario for any household, and “what if something goes wrong?” is a fair question. But there is no mechanism by which a switch could cut your supply, even by accident. You are the old supplier’s customer until the registration completes, and the new supplier’s customer from that moment on. There is no in-between where you belong to nobody, and disconnection for its own sake is not part of the process at all.
One honesty note: matched.ie is not a CRU-accredited price-comparison or switching site — we rank suppliers and explain the process in plain words, nothing more. The CRU publishes its list of accredited comparators at cru.ie, and the network operators’ own consumer pages are at esbnetworks.ie and gasnetworksireland.ie.
What actually changes when you switch — and what doesn’t?
Put the two lists side by side and the switch shrinks to its true size. Everything that changes is administrative; everything physical stays put.
| Changes ✓ | Does not change ✗ |
|---|---|
| The name on the bill — a new logo, a new layout, a new customer number. | The wires and pipes — ESB Networks and Gas Networks Ireland run them for every home, whoever bills you. |
| Your unit rates and standing charge — the entire point of switching. | Your meter — it belongs to the network side and stays exactly where it is. |
| The app and online account — you download the new supplier’s app and stop using the old one. | Your MPRN and GPRN — they identify the connection at your address for life, not your supplier. |
| The customer-service number for bills, rates and account queries. | The supply itself — same grid, same gas, same reliability, no interruption of any length. |
| The direct debit — the old mandate lapses after the final bill; the new one takes over. | The emergency numbers — power cuts are still ESB Networks; gas emergencies are still Gas Networks Ireland. |
Notice what is missing from the left column: anything involving your house. Even your meter-reading routine is unchanged — the same meter, read the same way, just reported to a different company. If you want a refresher on where the numbers live, see find your MPRN and find your GPRN.
What arrives after you sign up, in order?
From your side, a switch is a short sequence of things landing in your inbox and letterbox. Here is the running order — the detailed day-counts live on how long a switch takes, so this is just the shape of it.
| In order | What it is | What to do with it |
|---|---|---|
| 1. Confirmation email | The new supplier confirms your sign-up. The 14-day cooling-off clock starts here. | Keep it — it is the date that matters if you change your mind. |
| 2. Welcome letter / pack | Your contract: rates, standing charge, contract end date, cooling-off terms. | Read it properly — checklist below. |
| 3. The opening read | Your meter reading (or a remote smart-meter read) becomes the handover line between suppliers. | Photograph the meter around switch day, just in case. |
| 4. Switch completes | The registration goes live — you are now the new supplier’s customer, at the new rates. | Nothing. You will not notice the moment it happens. |
| 5. Final bill (old supplier) | Charges up to the closing read, plus any exit fee, minus any credit owed back to you. | Pay it — see why below. |
| 6. First new bill | The new supplier bills from the opening read at the new rates. | Check the opening read matches the final bill’s closing read. |
That is the entire lived experience of a switch: six pieces of correspondence, one photograph, zero interruptions. Everything else happens in industry systems you never see.
What is the welcome letter and what should I check in it?
The welcome pack — a letter, an email, or both — is your actual contract, and it deserves five minutes with a cup of tea rather than a glance. Four checks:
- The rates. The unit rate(s) and standing charge should match the offer you accepted, including the discount. If a number differs from what you signed up for, query it immediately — inside the cooling-off window, walking away is still free.
- The contract end date. Nearly every new-customer deal is a 12-month discount that dies at month 12 and drops you onto the standard rate. Put a reminder in your phone for month 11 — the year-1 vs year-2 cliff is the single most expensive thing in Irish energy.
- The cooling-off deadline. You have 14 days from signing up to cancel without penalty — 30 days on some doorstep and other off-premises contracts under the Consumer Rights Act 2022. Use the figure printed in your own pack. The full rules are on the cooling-off page.
- The direct debit and billing details. Right IBAN, right billing frequency, paperless if the discount requires it — many of the deepest discounts are conditional on both direct debit and e-billing, and losing a condition can quietly cost the discount.
If it all checks out, file it and forget it. If you get cold feet for any reason at all — a better deal, a bad review, no reason whatsoever — cancelling inside the window costs nothing and your supply simply stays where it was.
What is the opening read and why does it matter?
One meter reading is the hinge of the whole switch. The read taken around switch day becomes the old supplier’s closing read and the new supplier’s opening read — the exact same number, doing two jobs. Every unit you used before it is billed by the old supplier at the old rates; every unit after it is billed by the new supplier at the new rates. Because it is a single shared number, the same unit can never be billed twice.
You will usually be asked for a reading when you sign up, and you can submit an updated one around the transfer date. On a smart meter the read can be collected remotely, which removes the homework entirely. Either way, do one thing for yourself: photograph the meter around switch day. If the final bill ever looks wrong, a dated photo settles the argument in one text. If a read cannot be obtained at all, an estimate is used — and a wildly wrong estimate is the most common cause of a surprising final bill, which is exactly what the photo protects you from. How to read the dials and digits is covered in reading your electricity meter and reading your gas meter, and the mechanics of sending one in are on how to submit a meter reading.
What about the old supplier’s final bill?
Pay the final bill. It is the one piece of the process people are tempted to ignore — the relationship is over, the app is deleted, the letter looks like junk. But a final bill is a real debt, and domestic energy arrears of €225 or more left more than 60 days overdue can be flagged in the switching system — which lets a supplier block or delay a future switch until it is cleared. An unpaid final from two suppliers ago is the classic reason next year’s easy switch suddenly isn’t.
If the final bill is genuinely a struggle, don’t ignore it — suppliers must offer payment plans, and MABS, the free state money-advice service, will help you negotiate one. Already in arrears and wondering whether you can switch at all? That has its own honest page.
The final bill itself holds no mysteries: your usage up to the closing read at the old rates, any early-exit fee if you left a fixed term before it ended, and — pleasantly often — a refund. If your account was in credit, perhaps because a level direct debit outran your summer usage, that credit must be returned to you, not absorbed. Check the closing read against the photo, check any credit came back, pay whatever balance stands, and the old relationship is cleanly over. If something on it looks wrong and the supplier won’t fix it, the complaints route runs from the supplier’s own process to the CRU’s customer-care team.
When do the new rates actually start?
On the day the switch completes — not the morning after you sign up. This catches people out in both directions, so it is worth being precise.
Between signing up and completion — typically two to four weeks, and often nearer the two — you are still the old supplier’s customer, using energy at the old rates, and the old supplier is entitled to bill you for those weeks. That is not a con or a delay tactic; it is simply how a handover with no supply gap works. The closing read draws the line: old rates before it, new rates after it, to the unit.
The other direction matters more for your calendar: the 12-month discount runs from the completion date, not the sign-up date. If you signed on 1 March and the switch completed on 18 March, month 12 ends in the following March — so set the month-11 reminder from the completion date on your welcome correspondence or first bill. And if part of the appeal was a cheaper night rate or a smart time-of-use plan, those windows also begin at completion; the tariff mechanics live on NightSaver explained and time-of-use tariffs.
Switching myths vs the facts
Every one of these has kept someone on an expensive standard rate for years. Line them up against reality:
| The myth | The fact |
|---|---|
| “They’ll cut me off if I leave.” | Nobody can. ESB Networks runs the wires and Gas Networks Ireland runs the pipes for every home in the state, whoever bills you. A switch never touches the physical supply — there is no disconnection step anywhere in the process. |
| “Someone has to call out and change the meter.” | No visit, no van, no appointment. Your meter stays exactly where it is, and so does the MPRN (11 digits, starts with 10) or GPRN (7 digits) that identifies your connection. The switch happens in a registration database, not at your house. |
| “The new electricity might not be as good.” | There is one grid and one gas network. The same electrons and the same gas arrive through the same meter the day after the switch as the day before. Suppliers compete on price and service — the product itself is identical. |
| “I have to cancel with my old supplier or I’ll be billed twice.” | The old supplier is told automatically through the change-of-supplier registration, and one closing meter read is the hard line between the two bills. The same unit is never billed by both — there is nothing for you to cancel. |
| “The cheap new rates start the morning after I sign up.” | They start on the day the switch completes — typically two to four weeks after sign-up. Until that date you are on the old supplier’s rates, and your 12-month discount clock runs from the completion date, not the day you signed. |
The pattern across all five: the myths imagine a switch as a physical event, and it simply isn’t one. It is a database entry, a handful of letters and one meter reading. The households who understand that switch every year and pocket the new-customer discount every year; the households who don’t pay the standard rate indefinitely for a risk that does not exist.
Ready to actually do it?
- How to switch energy supplier — the step-by-step: MPRN, meter reading, exit fees, and why you never ring the old supplier to cancel.
- How long does a switch take? — the day-by-day timeline of the 2–4 weeks.
- Best energy in Ireland — all nine suppliers ranked with year-1 and year-2 cost, or the 30-second find your energy matcher.
- Cooling-off after a switch — the 14/30-day escape hatch if you change your mind.
- Year 1 vs year 2 prices — the discount cliff, and when to set the reminder.
