Is it safe to give my utility account number to someone who calls claiming to be from my energy supplier?
Your utility account number alone poses limited risk, but callers claiming to be from your energy supplier may be attempting to switch your service, harvest personal data, or conduct social engineering. Always verify calls independently.
Last reviewed: 10 June 2026
Explanation
Energy and utility impersonation fraud takes several forms. The most financially damaging involves unauthorised switching: a caller obtains enough information from you — account number, address, full name — to switch your energy contract to a new supplier (often a shell company they control) without your genuine consent, triggering exit fees, changing your tariff, or enabling further fraud.
Another pattern uses the utility company as a trust-building cover: the caller confirms some details they already have about you (from a data breach or directory listing), gains your confidence, and then pivots to collecting more sensitive information or requesting payment for a non-existent problem.
Energy suppliers do make outbound calls, but they will not be offended if you verify their identity. Hang up and call the number printed on your most recent bill or on the supplier's official website. A genuine representative from your supplier will completely understand this verification request.
Do not provide payment details, bank account numbers, or full personal details to an inbound caller regardless of how convincingly they present. Utility companies can access your account from their side without you providing credentials over the phone.
Common red flags
- Caller asks for your bank details to process a rebate or update a direct debit
- Caller claims there is an urgent problem with your meter or supply that requires immediate action
- You are told your current tariff is expiring and you must switch today
- Caller cannot confirm your service address or contract details independently — they are asking you to confirm everything
- Call is from an unfamiliar number not shown in previous correspondence from your supplier
What to do now
- Tell the caller you will call back on the official number and hang up
- Call your utility company using the number from your bill or official website
- Never provide bank details or full personal information to an inbound caller
- If you believe you were switched without consent, report to your utility regulator
- Report suspicious calls to your national fraud reporting service
Frequently asked questions
Can my energy supplier be switched without my knowledge?
Erroneous switching does occur, sometimes fraudulently and sometimes due to administrative errors. Check your current supplier details regularly, especially if you receive unexpected correspondence from an unfamiliar supplier.
Is it safe to discuss a cheaper tariff offer from a caller?
You can listen to a tariff offer without providing any sensitive information. Any offer should be followed up by navigating independently to the official supplier's website or calling them directly to verify the deal is real before agreeing.