Economy 7 vs Smart Tariffs: Which Off-Peak Electricity Deal Could Save You Money?

How Off-Peak Electricity Tariffs Work

Off-peak electricity tariffs offer a simple premise: use energy when demand is lower, and you'll pay less for it. These tariffs charge different rates throughout the day, with the cheapest periods typically falling during nighttime hours when overall electricity demand drops.

The traditional Economy 7 tariff provides a seven-hour off-peak window, usually from midnight to 7am, during which electricity costs significantly less than the standard daytime rate.^[1] Modern smart time-of-use tariffs take this concept further, offering dynamic pricing that can change every 30 minutes based on wholesale market costs.

To access these tariffs, you'll need a compatible meter. Economy 7 requires either a traditional two-rate meter or a smart meter, while the newer smart tariffs generally need a smart meter to track your usage patterns accurately.

Comparing Your Off-Peak Options

The off-peak electricity market has evolved considerably, with several major suppliers now offering competitive time-of-use deals. Here's how the main tariffs compare:

Source: Smart Energy Solutions UK, WhichEV^[2][3]

The standout feature is how dramatically these rates differ from the current standard rate of 27.69p/kWh under the price cap. Octopus Energy's Agile tariff, for example, can offer rates as low as 7p/kWh during certain off-peak periods.^[2]

Economy 7 vs Smart Tariffs: What's the Difference?

Economy 7 operates on a fixed schedule with predictable off-peak hours, making it straightforward to plan your energy usage around. Smart tariffs like Agile Octopus offer more flexibility but require you to monitor pricing updates to maximise savings.

Smart tariffs often reward households that can be flexible with their energy consumption, particularly those with electric vehicles, heat pumps, or storage heating systems that can automatically shift usage to the cheapest periods.

Calculating Whether You'll Actually Save Money

The potential savings from off-peak tariffs depend entirely on your ability to shift energy consumption to cheaper hours. Here's how to work out if it makes financial sense for your household:

Step 1: Analyse Your Current Energy Usage

Look at your energy bills to understand your monthly and annual consumption. Identify which appliances use the most electricity: typically your heating system, water heating, washing machine, dishwasher, and any electric vehicle charging.

Step 2: Estimate Your Off-Peak Usage Potential

Consider how much of your energy consumption you could realistically shift to off-peak hours. Can you run your washing machine and dishwasher overnight? Do you have storage heating or a heat pump that could operate during cheaper periods?

Step 3: Run the Numbers

Take your annual electricity consumption and split it between potential off-peak and peak usage. Multiply each portion by the relevant tariff rates, then add the annual standing charge. Compare this total to your current annual costs.

Real-World Savings Examples

The most substantial savings typically come from high-energy applications that can easily shift to off-peak hours.

Electric Vehicle Charging

EV owners often see the biggest benefits from off-peak tariffs. Charging overnight at 7p/kWh instead of 27.69p/kWh can reduce running costs by 60-75% compared to standard rates.^[2] For a typical EV doing 10,000 miles annually, this could mean savings of several hundred pounds per year.

Heat Pump Households

Heat pumps paired with appropriate tariffs can deliver significant savings. EDF's Heat Pump Tracker offers off-peak rates of 15.63p/kWh during specific periods, potentially leading to annual savings of approximately £570 for suitable households.^[4]

High Night-Time Usage

Households that already use substantial electricity during traditional off-peak hours (perhaps due to shift work patterns or existing storage heating) often find Economy 7 delivers immediate savings without requiring any lifestyle changes.

Key Considerations Before Switching

Off-peak tariffs aren't automatically better for every household. Several factors determine whether they'll reduce your bills:

Meter Compatibility

You'll need either a smart meter or a compatible two-rate meter to access off-peak rates.^[1] If you don't have the right meter, factor in the time and potential cost of getting one installed.

Peak Rate Premium

Most off-peak tariffs charge higher rates during peak hours than standard tariffs. If you can't shift enough usage to off-peak periods, you might end up paying more overall.

Lifestyle Flexibility

Consider whether your daily routine allows for shifting energy-intensive activities to off-peak hours. This works well for some households but can be impractical for others.

British Gas vs Octopus Energy Approach

When comparing suppliers, note that some focus more heavily on smart tariff innovation than others. Octopus Energy has built a reputation around flexible, tech-driven tariffs, while traditional suppliers like British Gas offer more conventional Economy 7 options alongside their standard deals.

Getting Started with Off-Peak Tariffs

If the numbers suggest off-peak tariffs could work for your household, the switching process is typically straightforward. Most suppliers can handle the switch remotely if you already have a compatible meter.

For new tenants, it's worth checking what type of meter your property has before committing to any tariff type, as this will influence which options are available to you.

Services like Lodo can help you navigate the various off-peak options available and handle the switching process, comparing tariffs from different suppliers to find the best match for your specific usage patterns.

Frequently Asked Questions