Octopus Agile gets described as the cheapest tariff in the UK. It isn't. It's the most variable. That's not the same thing.
Agile gives you half-hourly pricing based on the wholesale market. Overnight: 3–10p/kWh. Peak: 30–50p/kWh. Same home. Same day. Completely different cost.
Most households use energy in the evening — cooking around 6–8pm, heating at similar times, charging EVs when they get home. That's exactly when Agile is most expensive.
Agile works if your home can respond. You need flexible demand (EV charging, battery storage, heat scheduling), genuine automation, and enough usage to move the needle. Small homes without shiftable load don't benefit much.
This sounds simple. In practice, it fails — because prices change daily, peak windows shift, and cheap periods aren't fixed. You're not avoiding peak. You're guessing.
Most Agile homes avoid peak sometimes and miss it other times. They shift some load, leave a lot unchanged. The result isn't a big loss — it's a steady leak.
£1–£3 per day. £500–£1,500 per year. Not a disaster in one moment — just consistently suboptimal.
Agile is a bad fit if you don't automate, use most energy in the evening, or want predictable bills.
Not "Is Agile cheap?" but "Can your home actually respond to it properly?"
If the answer is no, Agile becomes a liability — not an asset.
Agile isn't a tariff. It's a system. Without coordination, it doesn't work.