Heat Tariffs

Understand how to build fair, transparent tariffs that balance resident affordability with operational costs. Learn the formula for compliance-grade pricing under Ofgem.

Understanding Heat Tariffs

A heat tariff is the way costs are fairly divided between residents, ensuring the network covers its running costs while remaining affordable and transparent. It’s also a regulatory requirement - Ofgem will expect suppliers to be able to demonstrate that tariffs are fair, evidence-based and compliant.

A regular tariff review ensures the cost of running the heat network is recovered fairly and transparently. Energy prices, system performance and operational costs can change over time, so setting the tariff correctly is essential to avoid shortfalls or over-recovery.

By reviewing the data and updating the tariff accordingly, you can ensure charges to residents accurately reflect the true cost of delivering heat, while maintaining financial balance across the network.

With Ofgem introducing stronger consumer protection for heat networks, there is now a greater expectation around fair charging, transparency, and proper financial planning. That means tariffs need to be supported by clear data and communicated to residents with the required notice period.

Why It Matters

For residents, tariffs are about trust. Clear, transparent calculations build confidence that they are only paying their fair share. For property managers, getting this right reduces disputes, supports compliance and protects reputations.

Tariffs are where regulation meets reality. If your network is inefficient or your billing inaccurate, it will show up in what residents are charged. Data is the difference between fair and unfair bills.

Daniel Davies - d-Analysed

There are three main components to consider when calculating a heat tariff

Main Utility Supply Contract Costs

The wholesale cost of the energy coming into the building - whether that’s gas, electricity, or another source. This is usually the largest part of the tariff.

Network Efficiency

How much of that purchased energy actually reaches residents’ homes. Losses in the system (e.g. poor insulation, unbalanced flow, plant inefficiency) push costs up. The more efficient the network, the fairer the tariff.

Fixed Costs

These can include operation and maintenance, metering and billing services and call-outs and reserve fund contribution. Fixed costs need to be recovered to keep the network viable.

Turning Costs into Tariffs

A Worked Example:

Let’s say your network buys £100 of energy from the utility supplier.

If your network is operating at 90% efficiency, then around £90 worth of usable heat makes it into residents’ homes.
If your network is only 40% efficient, then just £40 worth of usable heat is delivered - the other £60 is wasted in losses.

Now imagine those wasted costs don’t just disappear. They end up on residents’ bills.

This is why tariffs can’t just be about utility prices. They have to reflect:

1.    Contracted supply costs (the £100 you buy in).
2.    Efficiency losses (how much of that energy is actually delivered).
3.    Fixed costs (maintenance, metering, billing, emergency support).

So, two networks with the same supply contract could end up with wildly different resident bills purely because of efficiency.

For Grace, this worked example is a wake-up call: she realises her tariff review isn’t just an accounting exercise. It’s a direct reflection of how well her network is managed and maintained.

Tariffs can’t just be set once and left. Prices, efficiency and maintenance costs change. That’s why regular tariff reviews are essential - not only for compliance but also for resident trust and affordability.

Data Energy offers several options for tariff reviews, giving property managers like Grace confidence that they are charging fairly and staying compliant.

Practical Support

Annual tariff reviews aligned to utility contract renewals
Independent efficiency reviews to check performance
Ongoing balancing of costs vs funds collected from residents
Seasonal tariff review with different rates for winter/summer months
Full financial reconciliation at the end of the tariff period

Fair Pricing

When Ofgem’s framework goes live, every heat supplier will need to be authorised. Alongside this, pricing rules will ensure residents pay fair, transparent and justifiable tariffs.

For most, these roles will be held by the same entity. If a network is part of a larger district scheme with a thermal substation, the segment from the substation to consumers is registered separately, with its own designated Operator.

What it Means for PMs:

No more "back of an envelope" tariffs.
Tariff methodology must be documented.
Prices must be competitive and proportionate.

A Step-by-Step Approach

Collect the data – fuel input costs, performance data and fixed costs.
Allocate costs fairly – split between fixed and variable, ensuring residents pay for what they consume while sharing the true cost of operating the system.
Check compliance – whilst nothing was included in the Heat Network (Metering & Billing) Regulations, Ofgem will soon publish fair pricing regulations.
Communicate clearly – residents need to understand their bills and simple visuals can help. A transparent tariff builds trust.