How to Optimise Operations to Meet Tightening Scope 2 Emission Targets
Regulators, investors and customers are all sharpening their focus on Scope 2 emissions, and the margin for error is getting slimmer. With the GHG Protocol’s first major revision to its Scope 2 Guidance since 2015 now moving through its standards update process following the 2025–26 public consultation, and UK reporting rules continuing to mature, operations and supply chain teams face growing pressure to prove their energy use is under control.
For most industrial organisations, the biggest wins are hiding in plain sight. Compressed air, motors, heating and cooling, and idle equipment quietly run up the electricity bill and, with it, the Scope 2 footprint. This article sets out what Scope 2 covers, where inefficiencies typically build up, how to calculate your emissions properly, and the practical steps to bring them down.
What Scope 2 Covers
Scope 2 emissions are the indirect emissions from the energy your organisation purchases and consumes, chiefly electricity, but also steam, heat and cooling bought from a third party. The emissions happen at the power station, not at your site, but they sit on your balance sheet because you chose to buy the energy.
That distinction matters. Scope 1 covers what you burn directly, such as gas in a boiler or diesel in a fleet vehicle, Scope 3 covers everything further upstream and downstream, from supplier emissions to end-of-life product disposal. Scope 2 sits between them and tends to be the most actionable category, because reducing electricity demand or switching supply contracts produces measurable results relatively quickly.
UK operators should also be aware that, under Streamlined Energy and Carbon Reporting, large unquoted companies, quoted companies and LLPs meeting the thresholds must disclose energy use and Scope 1 and 2 emissions annually. The Department for Energy Security and Net Zero published an evaluation of SECR in January 2026, examining how the rules have worked in practice and signalling where further tightening may come.
Where Inefficiencies Build Up
Before you can fix anything, you need to know where the waste is. In most industrial settings, the same handful of culprits account for the bulk of avoidable Scope 2 emissions.
Compressed Air Systems
These are widely used across manufacturing, and it’s expensive to produce. According to recent industry analysis, compressed air can account for between 10 and 30 per cent of a facility’s total electricity consumption, with overall system efficiency often as low as 10 to 15 per cent. Leaks, over-pressurisation and oversized compressors running at part load all multiply that waste.
Oversized and Ageing Motors
Motors drive pumps, fans, conveyors and compressors across almost every industrial site. Older IE1 or IE2 units running below their optimal load draw significantly more electricity than modern IE3 or IE4 equivalents doing the same work.
Poor Load Matching
Equipment running flat out during low-demand periods, or short cycling during peaks, burns electricity without producing output. HVAC systems, chillers and compressors are common offenders.
Idle and Standby Loads
Machinery left powered up overnight, at weekends or during changeovers quietly accumulates consumption. In facilities without sub-metering, these loads often go undetected.
Lighting and HVAC Drift
Original control settings tend to slip over time. Lights stay on in unused zones, heating and cooling run against each other, and setpoints creep in whichever direction is most convenient for whoever adjusted them last.
A 2025 study published in the journal Processes demonstrated what’s possible when these issues are addressed systematically: on an industrial-scale compressed air system, targeted leak repair and a 0.5 bar reduction in set pressure cut average power consumption by more than 32 per cent.
How to Calculate Your Scope 2 Emissions
Scope 2 accounting follows two parallel methods, and the GHG Protocol requires most reporters to disclose both. This is known as dual reporting.
The location based method calculates emissions using the average emission intensity of the grid you’re drawing from. You multiply your electricity consumption (in kWh) by the relevant grid emission factor. For UK operations, this typically means applying the DESNZ conversion factors published each year.
The market-based method reflects the emissions associated with the electricity you’ve specifically chosen to buy. If you have a renewable supply contract or hold energy attribute certificates that meet the Scope 2 Quality Criteria, your market-based figure can be lower than your location-based figure. If you have no contractual instruments, a residual mix factor applies.
Full Scope 2 Guidance from the GHG Protocol sets out the detailed rules, including the eight Quality Criteria contractual instruments must meet and the disclosure recommendations. Anyone responsible for reporting should also keep an eye on the proposed revisions now being finalised, which include stricter geographic and temporal precision for both methods, along with hourly matching criteria for market-based accounting.
In practice, a credible Scope 2 number depends on three things:
- Accurate consumption data (meter readings, not estimates)
- The right emission factors for each site and supply arrangement
- Clean documentation of any certificates or contracts that support market-based claims
Rectifying the Inefficiencies
Once you know where your emissions are coming from, the work shifts from measurement to action. A practical order of operations helps here.
Measure Before You Act
An ISO 50001-aligned energy review, or a compliant ESOS audit for organisations covered by it, will surface the biggest opportunities and rank them by payback. Sub-metering individual systems, rather than relying on a single incomer reading, makes the biggest single difference to visibility.
Repair Before Replace
Compressed air leak surveys, pressure reductions, insulation repairs and HVAC recommissioning typically pay back in under a year and require little or no capital.
Replace the Worst Offenders
Old motors, fixed-speed compressors and over-specified equipment are often the worst offenders. Replacing a fixed-speed screw compressor with a variable-speed unit matched to actual demand can cut compressed air energy use by double-digit percentages on its own.
Recover the Heat You’re Already Paying For
Modern energy-efficient rotary screw air compressors use optimised rotor profiles to deliver the same output for less input. Well-designed systems can recover up to 96 per cent of the electrical energy a compressor draws as reusable heat, turning a Scope 2 cost into a space heating or process heating saving.
Switch the Supply Mix
Once demand is under control, market-based improvements come into play. A power purchase agreement or credible renewable tariff backed by Scope 2 Quality Criteria-compliant certificates can reduce the market-based footprint further. These measures only count if the demand-side work has been done first, otherwise you’re buying renewable cover for avoidable consumption.
Make Monitoring Routine
Continuous monitoring, alarm thresholds on key loads, and quarterly energy reviews stop the gains from drifting away. Operations teams that treat energy data with the same rigour as production data tend to hold onto their reductions.
Many of the pressures driving this work are shared across the wider supply chain, as covered in IoSCM’s analysis of sustainability pressures in logistics operations. The thread running through all of it is the same: efficiency delivered at source tends to be cheaper, more durable and easier to report than any offset or procurement workaround.
Pulling it Together
Tightening Scope 2 targets aren’t going to ease, and the direction of travel in the GHG Protocol revisions points towards more granular, more precisely matched reporting. For operations managers, that’s actually an opportunity. The same work that reduces reported emissions also reduces electricity spend, and the biggest gains usually come from systems that were never optimised in the first place. Start with measurement, fix the obvious waste, upgrade the highest-impact equipment, and only then move to the supply-side levers. The emissions picture improves, and so does the P&L.
