Cheapest energy tariff 2 bed flat Economy 7 (UK guide)

Decision checklist (2 bed flat)

• Do you have (or plan to use) storage heaters or an immersion heater on a timer?
• Can you realistically shift some high‑use electricity to the off‑peak period?
• Do your bills show separate day and night kWh, or can you access that via a smart meter?
• Are you comparing the same payment method (e.g. Direct Debit vs prepayment)?
• Have you checked tariff terms like exit fees and contract end dates?

Two realistic scenarios (with numbers you can adapt)

These examples use annual kWh only (not p/kWh rates) so you can plug your own figures into a comparison without relying on made‑up prices.

Pitfall 1: The off‑peak window isn’t what you think

Economy 7 off‑peak hours can differ by area and meter configuration. If you run appliances outside the actual off‑peak period, you pay the day rate and lose the benefit.

Pitfall 2: Day rate dominates in a flat with low night use

Some households only shift small loads (phone charging, a wash cycle). If most kWh stays in the day, the higher day unit rate can outweigh the cheaper night rate.

Pitfall 3: Not comparing like-for-like payment methods

Prices can vary for Direct Debit vs other payment types. If you compare assuming one method but pay another, the “cheapest” result may not match your actual bill.

Costs you should always check before switching

• Exit fees: possible on some fixed tariffs (varies by product).
• Standing charge: can be a major cost in smaller flats or low‑usage homes.
• Meter implications: switching away from Economy 7 may require a meter change in some cases—ask before you commit.
• Move-out timing: tenants should check whether a fixed tariff is worth it if the tenancy is short.

If you’re in a rented flat

In most cases, the person responsible for paying the energy bill can choose the supplier. But practical barriers exist in flats.

• Landlord/agent contact details: helpful if the meter is in a locked cupboard.
• Communal heating: you may only control electricity, not heating (changes the value of Economy 7).
• Prepayment meters: eligibility and processes can be different; compare using the correct meter type.

What is the cheapest energy tariff for a 2 bed flat on Economy 7?

It’s the tariff that produces the lowest estimated annual cost for your postcode and your day/night electricity split. Because Economy 7 has two unit rates plus a standing charge, the cheapest option varies by region, payment method, and how much electricity you use off‑peak.

How many off-peak hours do you get on Economy 7?

Economy 7 is designed to give around seven hours of off‑peak pricing overnight, but the exact times can vary by area and meter setup. Always confirm your specific off‑peak window on your bill, with your supplier, or via your meter information before relying on it.

Is Economy 7 usually cheaper for a 2 bed flat?

Sometimes. It can be cheaper if your flat uses a meaningful share of electricity overnight (for example, storage heaters or timed immersion heating). If most of your usage is in daytime, a single‑rate tariff can work out cheaper overall.

How can I estimate my day vs night electricity usage?

Start with your bill: many Economy 7 bills show separate day and night readings and kWh. If you have a smart meter, your in‑home display or supplier app may also show usage by time. If you can’t access a split, use a cautious assumption and re‑run your comparison once you have real numbers.

Can I switch supplier if I rent a 2 bed flat?

In many cases, yes—if you’re the bill payer. However, there can be practical issues like access to the meter, communal heating arrangements, or prepayment setups. If in doubt, check your tenancy agreement and refer to independent switching guidance.

Will I need a smart meter to get an Economy 7 tariff?

Not necessarily. Economy 7 can work with different meter types, but the way readings are recorded and billed can differ. The key is that your meter supports day and night readings (or equivalent) so you’re billed correctly for off‑peak use.

What details do I need to compare Economy 7 tariffs accurately?

Your postcode, whether you have an Economy 7 meter, your payment method, and ideally your annual electricity use (kWh) plus an approximate day/night split. If you don’t know the split, you can still compare—just treat results as provisional until confirmed.

Does the Ofgem price cap mean I can’t find a cheaper tariff?

The Ofgem price cap limits what suppliers can charge for default variable tariffs, but different tariffs can still have different prices and structures. The cheapest option for you depends on what’s available in your region and your usage pattern—especially on Economy 7.

Editorial ownership

• Written by: EnergyPlus Editorial Team
• Reviewed by: Energy Specialist
• Last updated: August 2026

How we assess “cheapest” for Economy 7 flats

We can’t know the cheapest tariff for every reader without your data. So this guide focuses on the decision factors that determine the lowest cost and helps you compare accurately using your own details.

• Inputs that matter: postcode (region), meter type (Economy 7), payment method, and estimated annual kWh plus day/night split.
• What we do not do: we do not publish or invent supplier‑specific unit rates, standing charges, exit fees, or “cheapest supplier” rankings (they change frequently and vary by postcode).
• What to watch: timing of off‑peak hours, standing charge impact in low‑usage flats, and whether your heating/hot water setup can actually use off‑peak electricity.