Time-of-Use Tariffs Explained: Should You Switch in 2026?

Time-of-use (TOU) tariffs charge different rates by hour. Done right, they cut bills 20%. Done wrong, they raise them. Here's how to tell.

What is a Time-of-Use (TOU) Tariff? Unpacking the Dynamics

At its core, a Time-of-Use (TOU) tariff is an electricity pricing structure that deviates from the traditional flat-rate model. Instead of paying a single price per kilowatt-hour (kWh) regardless of when you consume electricity, TOU tariffs introduce variable pricing based on the time of day, day of the week, and sometimes even the season. This means that electricity consumed during periods of high demand (peak times) is more expensive, while electricity consumed during periods of low demand (off-peak times) is significantly cheaper.

The rationale behind TOU tariffs is multi-faceted. From a grid operator's perspective, they aim to incentivise a shift in demand away from peak hours, thereby reducing strain on the national grid, minimising the need for expensive peaker power plants, and facilitating better integration of renewable energy sources which often have intermittent generation patterns. For consumers, the promise is lower electricity bills through smart consumption.

In the UK context, these tariffs typically define distinct periods: Off-peak: Often spanning late night to early morning (e.g., 12 am – 5 am). This is where the cheapest rates are found. Shoulder: Intermediate periods between off-peak and peak, sometimes offering moderately cheaper rates than peak. Peak: Usually late afternoon to early evening (e.g., 4 pm – 7 pm), corresponding to national demand spikes when people return from work, cook dinner, and use high-draw appliances. This is the most expensive period.

How TOU Tariffs Compare to Standard Tariffs

To truly appreciate the potential impact, let's consider the current landscape. Under the October–December 2026 Ofgem price cap, the average electricity unit rate for a typical direct debit customer in Great Britain is 26.32p/kWh. This represents the maximum unit rate suppliers can charge. Standard variable tariffs (SVTs) offered by suppliers will typically hover around this cap, or slightly below for competitively priced deals.

TOU tariffs, however, offer a much wider spread:

| Tariff Type | Off-peak Rate (p/kWh) | Peak Rate (p/kWh) | Standard Rate (p/kWh) | Notes | | :------------------ | :-------------------- | :---------------- | :-------------------- | :------------------------------------------------------------------------------------------------------- | | Standard Variable | N/A | N/A | 26.32p | Ofgem Price Cap reference. No flexibility, but predictable. | | Specific TOU | 7p - 10p | 24p - 32p | N/A | Rates vary significantly by provider and the specific TOU product. Requires active management. |

This table clearly illustrates the stark contrast. While a standard tariff offers predictability at a moderate cost, a TOU tariff promises potential huge savings off-peak but carries significant risk if peak usage isn't managed.

Examples in 2026: A Deeper Dive into UK Offerings

The UK energy market has seen a surge in innovative TOU tariffs, largely driven by the rollout of smart meters and the increasing adoption of electric vehicles (EVs) and heat pumps. Here’s a closer look at some prominent examples, including specific timings and target demographics, as we project them into 2026.

Related energy-saving tips

Consider Economy 7 if you can shift usage — Day/night tariffs charge less overnight and more by day, so they only help if you can move enough usage overnight.
Review your standing charges — Standing charges are a daily fee you pay regardless of use, and they vary by region and supplier.
Get a smart meter — A smart meter sends automatic readings and its in-home display shows when and where you use energy.