Dynamic tariffs: Is your business paying a 6pm premium for power?

Is a dynamic electricity tariff right for your business?

A plain-English guide to dynamic pricing, how it can cut your energy bill, and what to watch out for

Your electricity bill explained

Most businesses are on a fixed-rate electricity tariff. That means you pay the same price for every unit of electricity you use, no matter what time of day it is. Simple — but it might be costing you more than it should.

Here’s the thing: electricity isn’t the same price all day. It’s cheap overnight when most people are asleep and demand is low. It gets expensive in the evening rush hour — typically 4pm to 7pm — when everyone gets home and starts cooking, watching TV, and charging their devices at the same time.

A dynamic time-of-use tariff passes those price differences on to you directly, day-by-day. Use electricity when it’s cheap and you pay less. Use it during the expensive evening peak and you pay more. For many businesses who don't consume power during these peak periods, this is a significant opportunity to cut their energy bill.

Fixed vs dynamic: what’s the difference?

The chart below shows how a fixed tariff compares to a dynamic one across a typical day. On a fixed tariff, the dashed line shows you’re paying the same rate whether it’s 3am or 6pm. On a dynamic tariff, the price rises and falls with actual demand.

The shaded areas show where you win and where you need to be careful. The purple shading shows where a dynamic tariff is cheaper than fixed — which for most businesses is most of the day. The coral shading shows the expensive evening peak, where dynamic prices exceed the fixed rate.

The key insight: if your business doesn’t use much electricity between 4pm and 7pm, you could be paying significantly less than you are right now.

Which businesses benefit most?

The savings available from a dynamic tariff depend almost entirely on when your business uses electricity. The chart below shows how different types of business stack up.

Coffee shops and morning-led businesses come out on top. If you open at 6am and close at 2pm, your coffee machines, grinders, lights and other appliances are running almost entirely during the cheapest hours of the day. Switching to the right dynamic tariff could reduce your electricity costs by around 25-40%. Restaurants and evening venues face a trickier calculation — they trade right through the expensive peak window and need to think more carefully about whether a dynamic tariff suits them.

What loads could your business shift to off-peak hours?

• Refrigeration and cold storage — pre-cool overnight, coast through the peak
• Dishwashers and laundry — run before the morning rush rather than during service
• EV charging — charge overnight rather than during the working day
• Water heating — pre-heat storage boilers at night

The different types of dynamic tariff

Dynamic tariffs come in a few flavours. Here’s what you need to know:

• Half-hourly tariffs: The most flexible option. Prices change every 30 minutes based on the wholesale electricity market, and are published the evening before. You can plan ahead, shift loads on cheap days, and benefit from very low overnight prices. Octopus Shape Shifters Agile is a well-known example. Best suited to businesses with some flexibility in when they use electricity.

• Time-of-use tariffs with fixed bands: These have two or three set price tiers — typically a ‘peak’ rate, an ‘off-peak’ rate, and sometimes a very cheap overnight rate. The rates are fixed in advance, so there’s no day-to-day variability. A good middle ground: you still benefit from cheaper off-peak hours, but your bill is more predictable.

What’s the catch? Understanding price volatility

Dynamic tariffs are not without risk, and it’s important to go in with your eyes open.

The same mechanism that saves you money in normal conditions can work against you when something unexpected happens in the energy market. When wholesale prices spike — due to extreme weather, a geopolitical event, or a sudden surge in demand — peak prices on a dynamic tariff can temporarily rise well above what you’d pay on a fixed contract.

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This doesn’t mean dynamic tariffs are a bad idea - for many businesses you will still see savings even when prices rise more generally as peak prices increase more. Dynamic tariffs may require you to monitor your costs more closely, not just sign up and forget about them.
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Managing risk on a dynamic tariff

• Know your usage pattern before you switch. Tariff Tribe will only recommend a dynamic tariff if it will on average save you more than 10%.
• Set up price alerts. Most suppliers who offer dynamic tariffs apps let you know in advance when tomorrow’s peak prices are unusually high — so you can plan accordingly.

Is a dynamic tariff right for your business?

Ask yourself these three questions:

• When do you actually use electricity: If you can get hold of your smart meter data (your current supplier can provide this), you’ll be able to see exactly when your consumption peaks. If most of it happens before 4pm, you’re well-placed.

• Do you have any loads you could move: Even small changes — running the dishwasher at 10pm rather than 7pm, charging the van overnight — add up over a year.

• Can you live with some bill variability: A dynamic tariff means your monthly bill will fluctuate. Most months will be lower than expected; occasionally, during a market spike, they might be higher. If having a fixed, predictable bill is critical to your cashflow, a banded time-of-use tariff may suit you better than a fully agile product.

How Tariff Tribe can help

At Tariff Tribe, we help small and medium-sized businesses understand their energy usage and find tariffs that actually suit how they operate — not just the cheapest headline rate.

If you’d like to find out how your business would perform on a dynamic tariff, our free comparison tool can give you a personalised estimate based on your real consumption data.

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-> Visit tarifftribe.co.uk to run a free comparison