How a standard variable tariff works
A standard variable tariff charges a single unit rate for every kilowatt hour you consume. The rate applies at 3am, at 6pm, on a breezy Sunday, and on a cold January Thursday. The time, the weather, and the state of the grid are irrelevant to your bill.
The Ofgem price cap sets the ceiling on this rate. For July 2026, that ceiling is 26.11p per kilowatt hour, equivalent to an annual bill of approximately £1,862 for a typical household. Suppliers can and do charge less than this, but many default rates sit at or near the cap.
Standard variable tariffs exist because they are simple. No monitoring. No scheduling. No behaviour change required. You use electricity when you need it and pay the same rate regardless. For households with no flexibility over when they consume electricity, this simplicity is genuinely valuable.
The cost of that simplicity is that you are paying for the expensive electricity and the cheap electricity at the same blended rate. Your 3am consumption, which cost the grid almost nothing to generate, is billed identically to your 6pm consumption, which cost significantly more. The blended rate covers the average, and you capture none of the benefit when the average is pulled down by cheap overnight periods.
How Octopus Agile is different
Agile prices electricity in 30-minute slots. Each slot has its own rate derived from the EPEX wholesale market. Prices are published each afternoon for the following 24 hours. The range on a typical day runs from 2-8p overnight to 25-50p during the evening peak.
The key difference is that Agile passes the real cost of electricity in each half-hour period directly to you. When generation is abundant and cheap, your rate is low. When generation is scarce and expensive, your rate is high. The tariff is an accurate price signal rather than a smoothed average.
This creates an opportunity. Households that shift consumption toward the cheap periods and away from the expensive ones pay significantly less than the flat rate equivalent. The average saving is £440 per year, according to Octopus Energy. That figure comes entirely from the difference between what you would have paid at 26.11p flat and what you actually pay by concentrating consumption in cheaper slots.
Agile requires a smart meter. The half-hourly consumption data your meter transmits is what allows Octopus to apply the correct rate to each period. Without a smart meter, the mechanism does not exist. Check the live dashboard to understand what today's rates look like in practice.
The price comparison: typical day on each tariff
The table below shows how a typical Agile day compares to the standard tariff rate of 26.11p. These are representative Agile rates; actual prices vary daily.
| Time period | Standard tariff | Typical Agile rate | Saving per kWh |
|---|---|---|---|
| 3am - 6am | 26.11p | 3 - 6p | 20 - 23p saved |
| 6am - 9am | 26.11p | 8 - 16p | 10 - 18p saved |
| 9am - 4pm | 26.11p | 8 - 16p | 10 - 18p saved |
| 4pm - 5pm | 26.11p | 20 - 30p | -4 to +6p |
| 5pm - 8pm peak | 26.11p | 25 - 45p | -1 to -19p (more expensive) |
| 8pm - 11pm | 26.11p | 10 - 20p | 6 - 16p saved |
| 11pm - 3am | 26.11p | 2 - 8p | 18 - 24p saved |
The pattern is clear. Agile beats the standard tariff at every hour except the 5-8pm evening peak. The goal is to shift as much consumption as possible out of that peak window and into any other part of the day.
Annual bill comparison for three household types
The financial case for Agile varies significantly by household type. Here is how the numbers look for three representative households, all currently on the 26.11p/kWh standard tariff.
Standard household, no EV or solar. Annual consumption approximately 3,500kWh. Standard tariff annual bill: around £913 in electricity units (plus standing charge). An engaged Agile customer shifting 60% of consumption to cheap overnight and daytime slots saves approximately £440 per year, reducing the electricity unit cost to around £470. The standing charge remains the same on both tariffs.
Household with an electric vehicle. Annual home electricity consumption 3,500kWh plus EV charging of approximately 2,500kWh per year (around 10,000 miles). Total consumption 6,000kWh. At 26.11p flat, electricity units cost approximately £1,566. An Agile customer charging the EV exclusively overnight at an average of 4p reduces EV charging cost by approximately £550 alone. Combined with household shifting savings, total annual saving versus the standard tariff can reach £900 to £1,200.
Household with solar panels. Solar generation covers daytime consumption, so the household's grid draw is concentrated in mornings, evenings, and overnight. This naturally aligns with Agile's cheaper periods. Morning grid draw at 8-16p and overnight at 2-8p, with minimal exposure to the evening peak (partly offset by solar export in daylight). Agile savings for solar households can exceed the standard household figure significantly.
When does the standard tariff win? An honest answer.
Agile is not right for every household. The standard tariff is genuinely better in specific circumstances.
If you cannot shift any consumption away from the 5-8pm peak, you will pay more during those hours than a standard tariff customer. Households where cooking, heating, and all high-draw activity is permanently fixed in the peak window may find that Agile's overnight savings do not compensate for consistent peak exposure.
If monitoring prices and adjusting schedules causes significant stress or is simply impractical given your life, the cognitive overhead of Agile may not be worth the financial benefit. The standard tariff offers simplicity. That has real value for some people.
If you are on a fixed-rate tariff priced below 26.11p per unit, that rate may beat Agile's average without requiring any behaviour change. Fixed rates below 20p per unit represent strong competition for Agile. Above 20p, Agile's flexibility advantage generally wins.
The honest summary is that Agile rewards engagement. A household that checks prices daily, sets appliance timers, and charges their EV overnight will save substantially. A household that does none of these things may do no better than the standard tariff and could do modestly worse during high-peak periods.
The flexibility question: what Agile requires from you
Switching to Agile costs nothing beyond the time to request a tariff change from Octopus. But using Agile effectively requires building new habits.
The single most important habit is checking prices each afternoon after 4pm. Octopus publishes the following day's rates at this point. The AgileAlert dashboard shows these immediately, colour-coded by price. A 30-second check each afternoon tells you whether tonight has a cheap window worth acting on and whether tomorrow's peak is particularly severe.
The second habit is using delay-start functions on appliances. Most modern dishwashers, washing machines, and tumble dryers have timers. Setting them to run between midnight and 6am takes 20 seconds. Over a year, those 20-second adjustments compound into hundreds of pounds.
The third habit, relevant for EV owners, is scheduling charging. Most EV apps allow you to set a charging window. Set it for overnight and let it run without further thought.
None of this requires significant sacrifice. You are not going without. You are doing the same things at different times. The electricity is identical. The cost is dramatically lower. Agile is not a hardship. It is a reframe of when normal household tasks happen.