How to Switch Energy Supplier UK 2026 | Step-by-Step Guide

How to Switch Energy Supplier UK

Complete step-by-step guide to switching energy suppliers in 2026. Learn the process, timeline, exit fees, and how to save £100-300/year by finding better deals.

💰 Average Household Saves £200/Year by Switching

Switching takes just 5 minutes online and could save you £100-300 annually. Process is free, new supplier handles everything, switch completes in 17-21 days with zero interruption. Check comparison sites now - best fixed deals currently £168-208 cheaper than price cap.

5 mins
Time to Switch Online
17-21 days
Switch Completion Time
£200
Average Annual Saving
Free
Switching Cost (No Fees)

5-Step Energy Supplier Switching Process

Switching energy supplier is quick and easy. Follow these 5 steps:

Step 1: Compare Energy Deals

Use price comparison websites to find cheapest tariffs:

  • Recommended sites: MoneySuperMarket, Uswitch, Compare The Market, Which? Switch, Confused.com
  • Information needed: Postcode, current supplier name, annual energy usage (kWh from bill or estimate)
  • What to look for: Total annual cost (not just unit rate), contract length, exit fees, customer service ratings
  • Filter options: Fixed vs variable, green energy, online-only vs traditional service
  • Typical savings: £100-300/year vs staying on standard variable tariff

Step 2: Check Your Current Contract

Verify you can switch without penalties:

  • Fixed tariff: Check end date - may have £50/fuel (£100 dual fuel) exit fee if leaving early
  • Variable tariff: No exit fees - free to switch anytime
  • Find contract details: Check latest bill, online account, or contact current supplier
  • Exit fee decision: Compare exit fee cost vs annual saving on new deal. If saving £200/year and fee is £100, worth switching (6-month payback)
  • Switching window: Can switch up to 49 days before fixed contract ends without exit fees

Step 3: Sign Up With New Supplier

Complete online application in 5-10 minutes:

  • Personal details: Name, address, email, phone number, date of birth
  • Property info: Current supplier name, meter type (standard, Economy 7, smart), payment method (direct debit cheapest)
  • Meter readings: Recent electricity and gas meter readings for accurate billing
  • Bank details: Account number and sort code for direct debit setup
  • Switch date: Choose preferred switch date (typically 17-21 days from signup)
  • Confirmation: Receive email confirmation immediately with reference number

Step 4: New Supplier Handles Switch

Sit back and relax - new supplier does everything:

  • Contact old supplier: New supplier notifies old supplier of switch request
  • Objection period: Old supplier has 5 working days to object (rare - only if outstanding debt or incorrect details)
  • No action required: You don't contact old supplier - new supplier manages entire process
  • Cooling-off period: 14-day cooling-off to cancel switch if you change mind
  • Updates: Receive emails from new supplier confirming progress

Step 5: Switch Completes (17-21 Days)

Seamless transition with zero interruption:

  • Switch completion: Happens automatically on agreed date (17-21 days typical)
  • No power cut: Energy supply continues uninterrupted throughout - you won't notice anything
  • Final meter reading: Take reading on switch date and submit to both old and new suppliers
  • Final bill: Old supplier sends final bill (pay within 14 days, claim any credit owed)
  • New billing starts: New supplier begins billing from switch date
  • Smart meter compatibility: May temporarily lose smart functions if switching suppliers (being improved)

Switching Timeline: What Happens When

Typical 17-21 day switching timeline from signup to completion:

Day 0

Sign Up Online

Complete application with new supplier (5-10 minutes). Receive confirmation email with reference number and chosen switch date.

Day 1-2

New Supplier Contacts Old Supplier

New supplier submits switch request to old supplier. Old supplier sent notification of your switch.

Day 3-7

Objection Period

Old supplier has 5 working days to object. Objections rare (only if debt owed or details incorrect). Most switches proceed without issues.

Day 8-16

Switch Processing

Industry databases updated. Old supplier prepares final bill. New supplier sets up account. No action needed from you.

Day 17-21

Switch Completes

Supply automatically transfers to new supplier on agreed date. Take final meter readings and submit to both suppliers. Old supplier sends final bill, new billing begins.

Important: 17-21 days is typical but can be faster (minimum 14 days) or longer (up to 6 weeks for complex cases). During switching, continue paying old supplier until switch completes. New supplier bills from switch date forward.

When You Can and Can't Switch Supplier

✅ You CAN Switch If:

  • On standard variable tariff: No exit fees - free to switch anytime, any day
  • Fixed contract ending soon: Can switch up to 49 days before contract end date without exit fees
  • Willing to pay exit fee: Fixed contracts have £50/fuel (£100 dual fuel) exit fee, but may still be worth it if new deal saves £200+/year
  • Smart meter installed: Can switch but may lose smart functions temporarily (gradually improving as SMETS2 meters rolled out)
  • Renting property: Tenants can switch if bills are in their name (check tenancy agreement first)
  • Prepayment meter: Can switch - increasing number of suppliers now accept prepayment customers

❌ You CAN'T Switch If:

  • Outstanding debt: Owe money to current supplier (£500+ debt) - must pay or arrange repayment plan first
  • Bills not in your name: Landlord pays bills or property has communal heating - cannot switch
  • Switch already in progress: Must wait for current switch to complete before starting another
  • Objection period: Old supplier objects within 5 days due to debt or data issues - resolve problem first
  • Dynamic Teleswitching (DTS) meter: Rare old meter type - very few suppliers accept (may need meter upgrade first)

⚠️ Prepayment Meter Switching

Prepayment customers historically had fewer switching options. This has improved significantly with price cap protecting prepay users and more suppliers accepting them. Check comparison sites filtering for "prepayment meter" to see available deals. Octopus, OVO, E.ON Next, and British Gas all accept prepayment switches.

Information Needed to Switch

Gather these details before starting comparison or signup:

Information Where to Find It Why It's Needed
Postcode You know it Determines local distribution network and regional pricing
Current Supplier Name Latest bill or online account New supplier contacts them to arrange switch
Annual Energy Usage (kWh) Latest bill or annual statement Calculates accurate annual cost comparison vs estimates
Meter Type Check meter (standard, Economy 7, smart SMETS1/2, prepay) Different tariffs for different meter types
MPAN/MPRN Numbers Bill (21-digit electric MPAN, 10-digit gas MPRN) Unique property identifiers for energy supply
Current Tariff Name Latest bill Check exit fees and contract end date
Contract End Date Bill or online account Avoid exit fees by switching at right time
Recent Meter Readings Read meters manually or smart meter display Accurate final bill from old supplier, correct start bill from new
Bank Details (Direct Debit) Bank statement or online banking Set up cheapest payment method (DD typically £50-100/year cheaper)

← Scroll table horizontally on mobile →

Don't have annual usage? Comparison sites estimate based on property type and occupancy. Estimates usually close but using actual kWh from bill gives most accurate quotes. Check latest bill or annual statement for exact usage.

Best Energy Comparison Sites (2026)

Use Ofgem-accredited comparison sites for accurate, unbiased results:

Top 5 Comparison Sites

  1. Uswitch: Largest energy comparison site, covers all UK suppliers, user-friendly interface, includes customer reviews. Often has exclusive deals not available direct.
  2. MoneySuperMarket: Comprehensive comparison tool, clear filtering options, shows estimated annual savings. Owned by MoneySuperMarket Group.
  3. Compare The Market: Whole market coverage, meerkat rewards, app available. Good mobile experience.
  4. Which? Switch: Trusted consumer organization, no commercial bias, includes Which? supplier ratings. Recommended for impartial advice.
  5. Confused.com: Simple interface, shows top 5 deals clearly, includes green tariff filtering. Part of Admiral Group.

How to Use Comparison Sites Effectively

  • Check multiple sites: Results vary slightly due to different exclusive deals. Check 2-3 sites for best coverage.
  • Use actual usage: Enter kWh from bill not estimates for accurate quotes
  • Filter appropriately: Green energy, fixed vs variable, prepayment compatible, smart meter compatible
  • Read full details: Click through to see exit fees, contract terms, standing charges, unit rates
  • Check reviews: Customer service ratings important - cheap deal not worth it if supplier is terrible
  • Beware "projected" costs: Some sites show costs based on future price cap predictions - look for "current" costs

Can you switch directly with supplier? Yes, but comparison sites often have exclusive online deals not available direct. Comparison first, then check supplier website - occasionally direct can be cheaper but rare.

💷 Understanding Exit Fees

What Are Exit Fees?

Exit fees (early termination charges) are penalties for leaving fixed-term contracts before end date. Typical charges:

  • Electricity: £50 per fuel
  • Gas: £50 per fuel
  • Dual fuel total: £100 (£50 electric + £50 gas)

When Exit Fees Apply:

  • Fixed contracts: If you leave before contract end date (e.g., 12-month fixed, leave at month 8 = exit fees apply)
  • Variable tariffs: NO exit fees - free to switch anytime
  • 49-day window: Can switch up to 49 days before fixed contract ends WITHOUT exit fees

Should You Pay Exit Fees to Switch?

Calculate payback: Compare exit fee vs annual saving on new deal.

  • Example 1: Exit fee £100, new deal saves £200/year = 6-month payback. SWITCH.
  • Example 2: Exit fee £100, new deal saves £80/year = 15-month payback. WAIT until contract ends.
  • Rule of thumb: If payback under 12 months, usually worth switching. Over 12 months, wait.

How to Avoid Exit Fees:

  • Set reminder: 49 days before contract end, check market for new deals
  • Auto-switch services: Look After My Bills, Flipper, Switchcraft automatically switch you at contract end
  • Supplier reminder: Suppliers must remind you 42-49 days before end of fixed contract
  • Stay on variable: Variable tariffs have no exit fees - more flexibility but less price certainty

Common Switching Problems & Solutions

Problem 1: Old Supplier Objects to Switch

Cause: Outstanding debt over £500, incorrect details (wrong address/meter number), or administrative error.

Solution: Contact old supplier to resolve issue. Pay outstanding debt or set up repayment plan. Verify all details correct. Once resolved, switch proceeds automatically.

Problem 2: Charged Wrong Amount After Switch

Cause: Incorrect final meter readings leading to estimated bills rather than actual usage.

Solution: Submit accurate meter readings on switch date to both old and new suppliers. Keep photos of readings as evidence. If incorrect bill received, contact supplier with correct readings and request adjustment.

Problem 3: Smart Meter Stops Working

Cause: SMETS1 smart meters (installed before 2018) often lose smart functions when switching suppliers.

Solution: Meter still works but reverts to "dumb" mode - manually read and submit readings. Ask new supplier about SMETS2 upgrade (free, makes meter compatible with all suppliers). Government program upgrading all SMETS1 meters gradually.

Problem 4: Old Supplier Won't Refund Credit

Cause: Final bill not issued yet or supplier disputing final meter reading.

Solution: Old supplier must issue final bill within 6 weeks. Credit refunded within 14 days of final bill. If delayed, complain formally (supplier has 8 weeks to resolve). If unresolved, escalate to Energy Ombudsman (free, independent).

Problem 5: Switched to Wrong Supplier by Mistake

Cause: "Erroneous switch" - rare error where supplier switches wrong property.

Solution: Contact supplier immediately. Erroneous switches reversed within 20 working days. You're protected - billed at old rate, no penalties. If financial loss occurred, entitled to compensation.

⚠️ When to Complain & Escalate

Complain to supplier first: They have 8 weeks to resolve. Still unresolved? Escalate to Energy Ombudsman (free service, independent, binding decisions). Ombudsman can order compensation up to £10,000 for serious issues. Contact: 0330 440 1624 or ombudsman-services.org/energy

Switching Benefits vs Risks

✅ Benefits of Switching

  • Save £100-300/year: Biggest benefit - moving off expensive standard variable tariff
  • Better customer service: Escape poor-rated suppliers (British Gas, EDF) for highly-rated ones (Octopus, OVO)
  • Greener energy: Switch to 100% renewable suppliers for same or lower price
  • Price certainty: Fixed tariffs lock in rates for 12-24 months vs quarterly changes
  • Better features: Smart tariffs, time-of-use rates, EV charging deals, solar export payments
  • Free process: No switching fees, no admin hassle, new supplier does everything
  • Quick & easy: 5 minutes online, 17-21 days completion, zero interruption

❌ Potential Downsides

  • Exit fees: £100 to leave fixed contract early (though often still worth it)
  • Supplier failure risk: Small suppliers occasionally go bust (Ofgem protects you, but inconvenient)
  • Customer service varies: Cheap supplier may have poor service, long wait times
  • Smart meter compatibility: May lose smart functions temporarily (SMETS1 meters)
  • Admin effort: Need to compare, choose, submit readings (though minimal - 10 mins total)
  • Fixed tariff risk: If prices fall, you miss savings by being locked in
  • Overpaying risk: Forgetting to switch at contract end = expensive rollover to variable

🤖 Auto-Switch Services: Set & Forget Switching

What Are Auto-Switch Services?

Services that automatically switch you to cheaper energy deals when your contract ends or better deals appear. You authorize once, they handle all future switches.

Best Auto-Switch Services:

  • Look After My Bills: Free service, switches you automatically 47 days before contract end, aims to keep you in cheapest 20% of market
  • Flipper: Free, automatically switches when they find saving of £50+/year, focuses on reliable suppliers only
  • Switchcraft: Free, switches at contract end or when market improves significantly, rated 4.6★ Trustpilot

How Auto-Switch Works:

  1. Sign up: Provide current supplier, usage, preferences (e.g., green energy only, avoid certain suppliers)
  2. Authorization: Give one-time permission for service to switch you in future
  3. Monitoring: Service tracks market, your contract end date, and new deals
  4. Automatic switch: When good deal found (usually 47-49 days before contract end), service switches you automatically
  5. Notification: Receive email confirming switch details, can cancel within 14-day cooling-off if desired

Pros and Cons:

Pros: Completely hands-off, never forget to switch, always on competitive deal, free service.

Cons: Less control (can't choose specific supplier), may not get absolute cheapest deal (they avoid very small/risky suppliers), need to trust third party with data.

Verdict: Auto-switch services excellent for busy people or those who forget to switch. Typically keep you in cheapest 10-20% of market without any effort. Worth considering if you value convenience over finding absolute rock-bottom price.

💡 Top 10 Energy Switching Tips

  1. Switch regularly: Check market every 12 months minimum, ideally 49 days before fixed contract ends
  2. Use actual usage: Enter kWh from bill not estimates for accurate comparisons
  3. Check multiple sites: Compare 2-3 comparison sites for best coverage of deals
  4. Read customer reviews: Cheap supplier not worth it if service is terrible - check Trustpilot ratings
  5. Set reminders: 49 days before contract end to avoid expensive rollover to variable
  6. Take final readings: Accurate meter readings on switch date prevent billing disputes
  7. Pay by direct debit: Cheapest payment method, typically £50-100/year cheaper than other methods
  8. Consider auto-switch: Free services like Flipper or Look After My Bills automate entire process
  9. Don't fear small suppliers: Octopus, OVO are smaller than Big Six but have better ratings and prices. Ofgem protects you if they fail.
  10. Green energy costs same: 100% renewable electricity from Octopus/OVO same price as fossil fuel - no reason not to switch

📊 Energy Switching Summary

Process: Compare deals on comparison sites (5 mins), sign up with new supplier online (5 mins), new supplier handles switch (17-21 days), switch completes with zero interruption. Total effort: 10 minutes.

Savings: Average household saves £200/year switching from standard variable to fixed deal. Range £100-300/year depending on usage and current tariff.

Cost: Switching is FREE. No switching fees. Only cost is exit fees (£100 dual fuel) if leaving fixed contract early - often still worth it.

Timeline: 5 mins signup → 17-21 days completion → immediate savings. Faster than most financial switches (banks 7 days, mortgages months).

Requirements: No debt to current supplier, bills in your name, postcode and meter details. That's it.

Risks: Very low. Ofgem protects you if supplier fails. Energy supply never interrupted. Can cancel within 14 days.

Best Practice: Check market every 12 months, switch 49 days before contract ends, use comparison sites for best deals, set reminders to avoid expensive rollover.

Recommended: Compare now if you haven't switched in 12+ months. Currently fixed deals £168-208/year cheaper than price cap variable. Could save £14/month immediately.