What’s the best energy tariff for my business?
Business energy tariffs explained and compared.
When your energy contract comes up for renewal, one question usually rises to the top: is this really the best energy tariff for my business?
This guide breaks down the main business energy tariff structures, who they tend to suit, and the trade-offs involved in each. We’ll explore how different contracts manage pricing, risk and purchasing strategy, as well as what that means for your budgeting, forecasting and day-to-day management.
We’ll also look beyond the headline rate, covering the wider cost components that shape your total bill and how each relates to the growing role of sustainability, transparency and carbon reporting.
Author, Sam Taylor, develops TPI and intermediary partnerships at Good Energy, supporting brokers and consultants with forward-thinking renewable procurement strategies. He works closely with partners to navigate market volatility, regulatory change, and evolving hourly matching requirements, helping structure commercially sound solutions that balance risk, cost control, and decarbonisation..
Fixed rate tariffs
Best energy tariff for budget certainty, cost controls, and ease of management.
A fixed rate tariff gives your business an agreed unit rate for the duration of the contract and will span in duration from one to three years. This rate won’t change, regardless of market movements, which makes this a popular choice for small and medium sized businesses who value budget certainty.
Pros:
- It allows finance teams to forecast spend with confidence and reduces the need to constantly monitor market movements.
Cons:
- If the market drops significantly, you won’t be able to benefit from lower rates.
- Can include early termination fees meaning you must stick with it for the time agreed.
- Can include a volume tolerance, meaning you must use what you estimate within a certain percentage (usually 20-30%), or you could face a penalty.
There are also variations of fixed contracts where certain non-commodity costs, such as transmission, distribution and policy charges, are passed through at cost rather than fully fixed. Often referred to as fixed with non-commodity pass-through, this structure keeps the wholesale element stable while allowing network and system charges to move in line with actual costs. This may suit buyers who want overall price certainty but are comfortable accepting a limited degree of variability to ensure they are paying the true cost of those non-commodity elements.
Flexible purchasing tariffs
Best energy tariff for competitive rates, active risk management, and bespoke contracting terms.
A flex energy contract allows energy to be purchased in stages over time instead of locking in all your volume at once.
For larger organisations with higher energy spend, a flex contract can be the best energy tariff structure because it enables a more strategic approach to risk. Energy can be bought when market conditions are favourable, and purchasing can be spread to avoid committing everything at a single point in time.
Pros:
- Gives businesses more control over when and how they secure their energy prices, aligning buying decisions with movements in the wholesale market.
Cons:
- Require more engagement and understanding than fixed deals.
- Prices can move against you as well as in your favour, and there is greater complexity involved.
Businesses considering a flex approach often benefit from procurement expertise or external support to manage their strategy effectively. For businesses with the internal capability to monitor markets and make informed purchasing decisions, flex contracts can deliver strong results over time. However, they work best when supported by clear risk parameters and a defined buying strategy.
Index-linked energy tariffs
Best energy tariff for off-peak consumption, unknown volume requirements, and new connections.
An index-linked tariff tracks a wholesale market index (an index is a commodity price live view) meaning your business pays a price that will rise and fall in line with the market. Index-linked energy tariffs are best suited for businesses that understand market dynamics and can tolerate short term price swings.
Pros:
- Provides a high level of transparency because you can see how your energy price is formed day by day.
- Allows your business to benefit from whole price drops.
Cons:
- During periods of market stress, costs can increase dramatically, exposing businesses to unforeseen increases. The energy crisis of late 2021 provides a real-world example of how challenging prolonged volatility can become due to external geopolitical and supply pressures.
Without hedging any energy, this contract type comes with the fewest volume controlling terms, such as volume tolerance, benefitting customers with newly connected supplies but unknown consumption profiles, ramp up periods or future site plans. It also adds an advantage for customers that will mainly be using a decent amount of energy in the cheapest periods of the day, as their weighted average rate will typically be far lower than a standard fixed offering.
Power Purchase Agreements (PPAs) & Corporate PPAs
Best energy tariff for sustainability, reducing your company’s impact on the environment, and supporting British generators.
For some organisations, the best energy tariff isn’t a traditional supply contract at all, but a Power Purchase Agreement (PPA), or a Corporate PPA.
PPA (Power Purchase Agreement): A longer-term agreement to buy electricity directly from a renewable generator, such as a wind or solar farm. These agreements can be for any duration.
CPPA (Corporate Power Purchase Agreement): A longer-term agreement used by businesses that see energy as a strategic sustainability decision. These are typically for durations of three years upwards.
Pros:
- Both offer greater long-term price visibility and a much stronger link between your business and clean energy production.
- For the right business, they combine price stability with genuine renewable impact.
Cons:
- More complex and requires stable and predictable energy demand to work effectively.
These agreements are most often used by larger organisations across the public and private sector with predictable demand and defined sustainability targets. For those businesses, a PPA can move energy purchasing from a cost exercise to a strategic commitment.
Choosing the best energy supplier for your business
Selecting the best tariff for your business is only part of the decision. Choosing the right supplier matters just as much. Energy is no longer just an operational cost for many organisations. It’s tied to sustainability commitments, investor scrutiny and Scope 2 reporting: with your choice of supplier supporting or harming your wider ESG strategy.
Hourly renewable energy matching is becoming increasingly significant. As we approach 2027 and emissions reporting standards tighten, it will no longer be enough to claim renewable electricity on an annual basis. Hourly matching ensures the power you report was generated at the exact time it was consumed.
For organisations focused on long-term decarbonisation and credible Scope 2 reporting, this level of transparency helps strengthen reporting integrity and reduce the risk of greenwashing. Good Energy is already supporting all large business energy customers with this, by providing fully auditable hourly energy matching data.
Another factor to consider is your supplier’s approach to rising non-commodity costs. These costs, which include network, policy and system charges, often account for over 50% of your unit rate and the majority of your standing charge. While these elements are largely outside a supplier’s direct control, there are emerging ways to manage them more proactively, making tariff structure and supplier approach increasingly important.
Good Energy’s Hourly Matching Credit scheme helps reduce exposure to certain non-commodity charges when businesses align their consumption with renewable generation. This gives energy buyers more influence over part of their cost stack.
So, what’s the best energy tariff for your business?
The best energy tariff depends on how you balance price certainty, market exposure and your own businesses sustainability ambition. Fixed tariffs suit businesses that value stability. Flex and index-linked structures suit those willing to engage with the market. PPAs and hourly-matched renewable supply are strong options for organisations where long-term decarbonisation and credible reporting are key.
The right tariff depends on how your business operates, the level of risk you’re comfortable with and the role sustainability plays in your wider strategy. With a clear understanding of those priorities, you can choose a structure that supports your organisation both now and into the future.
That’s where the right partner makes a difference. Backed by over 25 years in renewables, in-house expert traders and a network of more than 3,000 independent British generators, Good Energy helps businesses navigate complex energy decisions with clarity and confidence.
Best energy tariffs for business: FAQs
The best energy tariff depends on how your business operates and what you prioritise.
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Fixed rate tariffs are best for businesses that value budget certainty, cost control and simple forecasting.
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Flexible purchasing contracts suit larger organisations with higher energy spend that want a more strategic approach to managing market risk.
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Index-linked tariffs are well suited to businesses comfortable with market volatility, particularly those with off-peak usage or uncertain consumption profiles.
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Power Purchase Agreements (PPAs) and Corporate PPAs are typically best for larger organisations with stable demand and defined sustainability targets, looking for long-term price visibility and a direct link to renewable generation.
There is no one-size-fits-all answer – the best energy tariff for your business is the one that balances price certainty, risk exposure and sustainability in a way that matches your business strategy.
A fixed rate business energy tariff locks in your unit price for the duration of your contract, typically between one and three years. This protects your business from market volatility and makes budgeting more predictable.
A flex energy contract allows businesses to purchase energy in stages rather than locking in their entire volume at once. This enables a more strategic approach to wholesale market movements but requires active management and risk oversight.
An index-linked tariff tracks wholesale market prices, meaning your unit rate rises and falls in line with the market. This offers transparency and the opportunity to benefit from price drops, but also exposes your business to volatility.
A Power Purchase Agreement (PPA) is a longer-term contract where a business buys electricity directly from a renewable generator, such as a wind or solar farm. PPAs are often used by organisations with long-term sustainability goals and stable energy demand.
A Corporate PPA (CPPA) is a long-term renewable energy agreement typically used by larger organisations. It provides greater price visibility and a direct link to clean energy generation, supporting credible ESG and Scope 2 reporting.
A CPPA is a type of PPA designed specifically for corporate buyers. It is typically longer-term and used by larger organisations that view energy as a strategic sustainability decision, rather than simply a supply contract.
You should start reviewing your business energy contract several months before renewal. This allows time to compare tariff types, assess risk exposure and choose a structure aligned with your operational and sustainability priorities.
While all renewable contracts allow you to claim renewable electricity, some provide a stronger link between your consumption and actual generation. Agreements such as PPAs or hourly-matched renewable supply offer greater visibility over where and when your power was produced, helping strengthen transparency, reduce the risk of greenwashing and support more credible Scope 2 carbon reporting.
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