Whether you're managing a household budget or running a business, the idea of shielding yourself from volatile market rates is appealing. But how do fixed tariffs work, and are they the best option for you?

Should you fix while prices are this high?

It's a fair question this autumn, because the wholesale prices behind a one-year fix are now well over double their February level. Year-ahead gas averaged 67.1p a therm in February and was 184.5p on 2 November, while year-ahead electricity went from an average of £67.58/MWh to £143.14/MWh.

Prices are also swinging on the news in both directions. Year-ahead gas jumped 20% on 19 March after Qatar's Ras Laffan LNG plant was hit, then fell 7.5% on 2 November on hopes of US-Iran talks. Energy UK has warned that in markets like this, supplier offers may stay open for only a few hours.

In simpler terms, a fixed price still buys certainty, but that certainty costs more than it did. If your renewal is close, we'd suggest getting quotes early so you're ready to sign when a good price appears. You can get a business energy quote to see where a fix would land today.

Line chart of year-ahead wholesale gas and power in 2026 against February's average: gas at 275 and power at 212 on 2 November

Understanding Fixed Price Energy Tariffs

A fixed price energy tariff means the rate you pay per unit of gas or electricity, and any standing charges, stays the same for the duration of your contract. That could be 12 months, 24 months, or even longer, depending on the deal you agree. The key point is that however the wholesale market moves during that period, your rate doesn't.

It's worth clearing up a common misconception here. A fixed tariff does not mean your total monthly bill stays the same. Your costs still vary with how much you use. If your business has a busy winter that demands high energy usage, that month's bill will be higher than in quieter months, even though the price per unit hasn't changed. Fixed price, not fixed bill.

Fixed tariffs do offer protection from market instability. When energy prices are rising sharply due to global events, supply issues, or changes in government policy, those on a fixed deal can relax knowing their rates are protected.

Is A Fixed Energy Tariff Best For Your Business?

For business owners, fixed price energy tariffs are particularly valuable tools for budget management. Knowing your energy costs ahead of time allows for more accurate financial planning, which can be essential for managing cash flow.

Businesses often have tighter operating margins and less tolerance for unexpected cost increases. Locking in a fixed energy rate can prevent financial stress during periods of market volatility. This is especially true in sectors where energy is a significant cost, such as manufacturing, hospitality, and retail.

The advantages at a glance

Budget certainty is the big one: you know your unit rate for the full term. Protection from price spikes is the second: when wholesale markets jump, you're insulated. And simplicity is the third: one rate, no monitoring required, no surprises mid-contract.

The trade-offs to understand

Nothing is free, and the certainty of a fixed rate has a price built in. Suppliers set fixed prices to cover their own risk, so a fixed quote will typically sit slightly above the market's expectation of average prices over the term. If wholesale prices fall after you fix, you're locked in above the market until renewal, and exiting early usually triggers termination fees. A fixed deal is insurance, and like all insurance, you pay a premium for it whether or not you end up needing it.

When fixing might not be the right move

If prices are unusually high when your renewal lands, locking in for a long term can mean fixing at the top of the market. In those conditions, a shorter fix, or for larger businesses a flexible purchasing arrangement that buys energy in tranches, may serve you better. Businesses with high, predictable consumption and appetite for some risk sometimes save money over time by staying closer to the market. The right answer depends on your tolerance for risk, your margins, and where the market sits when you sign.

Watch your contract end date

Businesses that fail to renew or switch before their fixed contract ends are usually moved onto expensive standard variable or out-of-contract rates automatically. These can be dramatically higher and come with fewer protections. That's why tracking contract end dates and planning ahead is vital. If you're a Purely Energy customer, we do this for you and let you know when your renewal is approaching, so you never drift onto out-of-contract rates.

Not all 'fixed' tariffs are equal

Some deals fix only the unit rate, leaving standing charges variable. Others are fixed for only part of the term, with a review clause partway through. And as we've covered elsewhere, many fixed contracts still allow suppliers to pass through changes in third-party charges like network costs. Always read what exactly is being fixed before you sign.

Before committing to a fixed energy tariff, it's a good idea to shop around. At Purely Energy, we work with over 30 suppliers, and each offers its own range of deals tailored to different needs. Working with a broker or comparison service can help you navigate these options and find the best tariff for your situation. If you would like help navigating the market to find the best deal for you, then Get A Quote.

How Can Purely Energy Help?

If you're ready to take control of your energy bills, now is the time to compare quotes and find a tariff that suits your needs, whether you're locking in a rate for a year or securing stability for the next three.

If you have questions about fixed energy contracts or want help lowering energy costs, contact us at 0161 521 3400 or Info@purelyenergy.co.uk. Alternatively, you can get an online quote from 18 suppliers.