Energy Procurement for Manufacturing

A mid-sized UK manufacturer running two shifts will typically have a half-hourly electricity profile that tells you more about its operations than its production schedule does. The morning ramp-up as machinery starts, the sustained plateau through core hours, the secondary peak when ancillary systems come online — these patterns are visible in the data, and they directly affect what you pay for energy. Most manufacturers on fixed all-inclusive contracts are paying a rate that was priced against someone else’s pattern, not their own.

Half-hourly profiles and why they matter

Any business consuming more than 100,000 kWh of electricity per year is likely to be on a half-hourly (HH) meter, or should be. Half-hourly meters record consumption in 30-minute intervals and transmit that data to the supplier automatically. The result is a granular consumption profile that exposes exactly when your business draws power and at what intensity.

For manufacturers, this profile is typically distinctive. Shift-based operations create clear demand spikes at startup — motors, compressors, CNC machinery, and process equipment all drawing simultaneously before settling into their running load. These peaks matter because electricity wholesale pricing in the UK market is time-differentiated; the cost of power at 07:30 on a weekday morning is structurally different from the cost at 14:00, and that difference flows through into pass-through contract pricing.

Understanding your HH profile before going to tender is not optional — it’s the foundation of an accurate procurement exercise. Without it, suppliers are pricing against estimated consumption curves, and the rate they offer reflects their uncertainty as much as the actual market. With a clean 12-month HH dataset, you can demonstrate exactly what your demand pattern looks like, which gives suppliers the confidence to price tightly.

Pass-through vs all-inclusive: the decision that matters most

This is the contract structure question that most manufacturers — and most brokers who don’t specialise in industrial procurement — get wrong. An all-inclusive contract bundles all the non-commodity costs (distribution, transmission, capacity market charges, balancing charges, metering) into a single pence-per-kWh rate. It’s predictable, simple to budget, and transfers the risk of network charge variation to the supplier — who prices that risk into the rate.

A pass-through contract (sometimes called a transparent or commodity-only contract) separates the wholesale commodity cost from the regulated network charges. You pay the actual network costs as they’re incurred, rather than a blended estimate. For manufacturers with large, stable consumption profiles, pass-through contracts typically deliver lower overall costs — but they require a degree of sophistication to manage, because your bill will vary quarter to quarter as regulated charges are reconciled.

The decision between the two depends on your risk appetite, your finance team’s capacity to manage variable billing, and the structure of your consumption. We work through this analysis with every manufacturing client before we go to market — getting it wrong in either direction is expensive.

Maximum demand charges and how they’re triggered

Maximum demand (MD) charges are levied based on the highest level of power drawn in any single half-hour period during the billing month. For manufacturers with heavy startup loads, this can be a significant cost — and one that’s almost entirely invisible in a standard all-inclusive contract (where it’s buried in the unit rate).

On a pass-through contract, MD charges appear explicitly, which creates both a cost and an opportunity. If your MD charge is being driven by a brief startup spike — say, three minutes of simultaneous motor starts — the answer is relatively inexpensive: a staggered startup sequence, a soft-starter on the largest motor, or in some cases a simple operational change. The savings can be material. We’ve seen manufacturers reduce their MD charge by 20 to 30% through startup sequencing alone, with no capital expenditure.

Pre-tender consumption analysis: the step most manufacturers skip

Going to market without a pre-tender consumption analysis is the procurement equivalent of tendering a construction contract without a bill of quantities. You’ll get prices, but you won’t know whether they’re accurate, competitive, or appropriate for your actual operation.

A proper pre-tender analysis for a manufacturing site covers: 12 months of HH data, identification of your peak demand periods and their drivers, any significant changes in production volume or process that will affect future consumption, ESOS or ISO 50001 obligations that affect your reporting requirements, and the contract end dates and notice periods for any embedded generation or PPAs on site. With that picture assembled, we can go to market with confidence — and compare supplier offers on a like-for-like basis rather than across incompatible assumptions.

The procurement angle: structure first, rate second

Manufacturing is the sector where getting the contract structure wrong costs as much as getting the rate wrong. A manufacturer on an all-inclusive contract who would benefit from pass-through is subsidising the supplier’s risk margin every month. A business with a spiky demand profile that’s never been analysed may be triggering avoidable MD charges on a monthly basis. These aren’t theoretical costs — they show up in every bill.

Our starting point with manufacturing clients is always the consumption data, not the rate. Once the structure is right, the rate conversation is more straightforward — and the saving delivered is typically larger than a rate-only negotiation would have achieved.

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FAQ

What is ESOS and does it apply to my manufacturing business? The Energy Savings Opportunity Scheme (ESOS) requires large UK businesses — defined as those with more than 250 employees, or a turnover exceeding €50 million and a balance sheet exceeding €43 million — to carry out energy audits every four years. Phase 3 compliance was required by June 2024. If you’re close to the threshold, it’s worth checking whether any group-level employee or turnover figures bring you into scope. ISO 50001 certification provides an alternative compliance route. ESOS audits must be conducted by a lead assessor registered with the relevant professional body.

We’re on a fixed contract that ends in eight months. When should we start the procurement process? Now. For a manufacturing site with significant consumption, a proper procurement exercise — consumption analysis, tender preparation, market approach, offer evaluation, and contract execution — takes eight to twelve weeks from start to finish. If your contract ends in eight months, you have a window to go to market without pressure. Wait until four months before end and you’re either accepting whatever the first supplier quotes or risking a gap in cover. The market rarely rewards urgency.

Can the right contract structure reduce our energy costs without any operational changes? Yes — and this is frequently underappreciated. Moving from an all-inclusive to a pass-through contract on a stable consumption profile can deliver savings of 5 to 12% on non-commodity costs alone, simply by paying actual network charges rather than a risk-inflated estimate. Similarly, a contract with a longer term (18 to 36 months) agreed at a market trough locks in savings that persist regardless of what happens to wholesale prices subsequently. Structure and timing deliver savings independently of anything your operations team does.