Fixed vs Variable Energy Rates Explained

What Are Fixed Energy Rates?

A fixed rate means your unit price (pence per kWh) is locked in for the duration of your contract, typically 1–3 years. For example, a fixed rate of 28p per kWh means you pay that regardless of market changes.

• Budget predictability — no surprises on your energy bills
• Protection from price increases during your contract
• Higher initial rate (supplier charges premium for certainty)
• Early exit fees if you need to switch before contract ends

What Are Variable Energy Rates?

A variable rate means your unit price changes based on market conditions, typically reviewed quarterly or annually. Your rate could go up or down depending on wholesale energy prices.

• Lower initial rate compared to fixed options
• Can benefit from price decreases when markets fall
• More flexibility — typically no early exit fees
• Budget uncertainty — difficult to forecast costs accurately

When to Choose Each Option

Choose fixed rates when budget certainty is critical, you're risk-averse, energy is a large expense, or current market rates are favourable. Choose variable when you have budget flexibility, can handle uncertainty, need flexibility (may move or change needs), or current fixed rates seem too high.

• Risk-averse businesses with tight margins → Fixed rates
• Startups or businesses in temporary locations → Variable rates
• High energy users wanting cost certainty → Fixed rates
• Businesses expecting energy prices to fall → Variable rates

Hybrid Strategies

You don't have to choose all-or-nothing. Hybrid approaches can balance certainty and flexibility.

• Split contract: 50% fixed, 50% variable — balances risk and upside
• Shorter fixed term: 1-year fixed instead of 3-year — provides some certainty with more flexibility
• Tiered approach: Lock in base load (fixed) and keep flexibility for variable usage
• Review annually and reassess your choice at each contract renewal

Key Takeaways

Fixed rates provide budget certainty and protection from increases. Variable rates offer flexibility and potential savings when prices fall. The choice depends on your risk tolerance and business circumstances. Market timing matters — lock in when rates are favourable. Hybrid strategies let you benefit from both approaches.