For most businesses, energy contract renewal sits somewhere between routine administration and quiet anxiety. The contract end date appears in the diary. Someone chases a renewal quote from the existing supplier. A number comes back. It seems roughly similar to last time. The contract gets signed.

This process costs UK businesses a significant amount of money every year.

Not because energy suppliers are deliberately exploitative - though default rates are rarely competitive - but because renewal is the single moment in your energy relationship where market dynamics work in your favour, and most organisations don't take full advantage of it.

This guide covers everything you need to know: when to start, what to look at, how to compare options properly, and how to avoid the mistakes that lock businesses into poor-value contracts.

Section 1 - Why renewal timing matters more than most people realise

Energy markets move constantly. Wholesale electricity and gas prices fluctuate daily based on supply and demand, weather patterns, geopolitical events, and infrastructure changes. The price you're offered at renewal reflects the market on the day your supplier prices it - but your exposure to that price will last for the duration of your next contract.

This creates an important but underappreciated dynamic: the timing of your renewal decision is as important as the supplier you choose.

A business that renews at the market peak can end up paying 20-40% more per unit than a comparable business that renewed six months earlier or later, despite identical usage profiles and similar supplier relationships. Neither business did anything obviously wrong - one just happened to be in the market at the wrong time.

The practical implication: renewal should not be treated as a fixed-date event. The process should begin 6-12 months before contract end so you have enough time to monitor the market, choose the right moment, and compare properly across multiple suppliers.

The default tariff trap

If your contract expires without a renewal in place, most UK commercial energy suppliers will roll you onto a default or out-of-contract rate. These rates are almost always significantly above standard contracted rates - sometimes two or three times higher.

Default rates are not a penalty exactly - they are the supplier's standard rate for uncontracted supply. But they are expensive, and the longer you stay on them, the more they cost. Organisations with complex procurement arrangements or multiple sites sometimes drift onto default rates across individual meters without noticing, particularly after supplier switches or site acquisitions.

Getting off default rates quickly - and auditing your portfolio to confirm no meters have been missed - is usually one of the highest-return actions available to a multi-site energy manager.

Section 2 - How far in advance should you start?

The standard guidance in the energy procurement industry is to begin the renewal process at least six months before contract end. For larger organisations, or those with complex multi-site portfolios, twelve months is more appropriate.

The reasons are practical:

• Market window - a six-month run-up gives you enough time to watch market movements and make a considered timing decision rather than renewing under pressure
• Supplier comparison - running a proper tender across four to six suppliers takes time; starting late means accepting whatever your existing supplier offers
• Internal sign-off - commercial energy contracts often require sign-off from finance or procurement leadership; building in time for that process avoids rushed decisions
• Contract start alignment - if your site has multiple contracts ending at different times, a longer lead-in gives you the option to align them, simplifying ongoing management

One important practical note: some energy suppliers require 30-90 days notice of intent to switch. Missing this window - even if you intend to renew with your existing supplier - can result in automatic rollover onto default rates. Check your current contract terms now.

Section 3 - Fixed, flexible, or SMARTFLEX?

The most important decision at renewal is the contract structure. The three main options:

Fixed price contracts

A fixed price contract locks in your unit rate for the duration of the agreement - typically one to three years. The price is set on the day you sign, and it doesn't change regardless of what happens in the wholesale market.

Fixed contracts give budget certainty. They suit organisations where budget predictability is the priority, or where the procurement team doesn't want to actively manage the energy position after signing.

The trade-off: if wholesale prices fall significantly after you fix, you're paying above the market rate for the remainder of the contract.

Flexible contracts

A flexible contract allows you to buy energy in tranches over the contract period, rather than fixing everything in one go. You can take advantage of market dips, buy forward when prices look favourable, and actively manage your exposure.

Flexible contracts offer real advantages and like any tool, they work best when paired with a clear plan for what comes next.

SMARTFLEX

SMARTFLEX is eyebright's risk-managed flexible approach. It combines the market access of flexible procurement with structured controls that limit downside exposure - allowing clients to benefit from market improvements without taking on uncapped price risk. For organisations that want more than a fixed price but aren't comfortable with full flexibility, SMARTFLEX provides a structured middle ground.

Section 4 - Running a proper renewal process

Step 1 - Audit your current position

Before approaching the market, understand where you are. What are you currently paying per unit? Are all your meters on contracted rates, or have any drifted onto default? What are your contract end dates across your portfolio?

Step 2 - Define your requirements

What does a good outcome look like - budget certainty, cost reduction, market flexibility, contract alignment? Defining this before you approach the market means you evaluate options against your actual needs, not just the headline unit rate.

Step 3 - Run a full market tender

Approach multiple suppliers simultaneously with a consistent brief. Getting comparable quotes from four to six suppliers is usually sufficient to establish a genuine market picture.

Avoid the common mistake of using a single broker tied to a preferred panel - their shortlist is not the whole market. Independent procurement advice with access to the full supplier base consistently produces better outcomes.

Step 4 - Evaluate properly

Unit rate is the most visible number but not the only one that matters. Compare standing charges and capacity charges, pass-through versus fixed non-commodity terms, contract flexibility and break clauses, and auto-rollover notice periods.

Step 5 - Choose the right moment to commit

Your procurement adviser should be monitoring market conditions and advising on timing - not simply presenting quotes and asking you to decide. Wholesale market intelligence is a core part of the value an independent adviser provides.

Section 5 - Multi-site renewal: additional complexity

For organisations managing multiple sites, renewal complexity multiplies. A coordinated multi-site procurement approach typically:

• Consolidates the portfolio under fewer suppliers, reducing management overhead
• Aligns contract end dates where possible, creating a single renewal window
• Uses aggregate volume to negotiate better unit rates
• Provides a single view of total energy spend through a platform like elexi

Section 6 - Common renewal mistakes

Renewing too late. Starting within 60 days of contract end leaves no room for market timing, proper comparison, or internal sign-off.

Accepting the incumbent's renewal quote without testing the market. Running a tender almost always produces better terms.

Focusing only on unit rate. Contract terms, non-commodity pass-through, and exit clauses all affect total cost.

Ignoring contract structure. Signing a fixed contract in a declining market, or a flexible contract without a management plan, are both avoidable errors.

Not reviewing the full portfolio. Missing meters on default rates, or failing to align contract end dates, leaves value on the table.

The bottom line

Energy contract renewal is a commercial decision that will determine your energy costs for the next one to three years. The most consistent predictor of good outcomes is starting early, running a full market process, and taking independent advice that isn't tied to a panel of preferred suppliers.