At TransitionHERO, we help industrial and greentech teams turn the carbon reduction hierarchy into practical, buildable projects, cutting emissions in the order that delivers the most impact for the least cost.

Where should you cut carbon first? For most industrial companies, that is the hardest question in the whole net-zero journey. There is no universal roadmap for industrial decarbonization, because every site starts from a different place, with different constraints and opportunities. That is why cutting CO2 emissions works best as a carbon reduction hierarchy: a clear order of priorities that moves from what you can save today to what you must manage tomorrow. Each step builds on the one below it. Here is how the six steps stack up, and where your biggest wins are likely to sit.

1. Energy savings: optimise before you switch

The foundation of any carbon reduction hierarchy is using less energy in the first place. Process intensification, higher efficiencies, and lower waste streams cut emissions before you change a single technology. The IEA calls energy efficiency the “first fuel”, because it delivers some of the quickest and most cost-effective CO2 cuts while lowering bills and improving energy security. In short, the cleanest energy is the energy you never use.

Your opportunity:

• Audit your processes for heat recovery, insulation, and equipment upgrades before investing in new assets.
• Treat efficiency as the cheapest ton of CO2 you will ever avoid.

Why it matters: efficiency shrinks the size, and the cost, of every step below it on the hierarchy.

2. Electrify low-temperature heat

The next step is fuel switching. Many industrial processes below roughly 150°C, common in food, paper, and textiles, can be electrified with heat pumps. The IEA highlights electrifying low-temperature heat as a key efficiency lever. They note that industry accounts for about a quarter of global CO2 emissions, much of it heat that could be electrified.

Your opportunity:

• Map your low-temperature heat demand and match it to heat pump or electric alternatives.
• Pair electrification with clean power so the switch delivers real emissions cuts.

Key stat: industrial heat pumps in Europe are already cost-competitive with gas at a coefficient of performance around 3, depending on the energy prices of gas and electricity in each country.

3. Electrify high-temperature heat

Lower in the carbon reduction hierarchy, it gets a bit more difficult, as high-temperature processes are harder to electrify. Pairing them with high-temperature heat storage can help bridge variable renewable supply, making use of varying energy prices through the day that are a result of the intermittency in generation of renewable electricity.

Your opportunity:

• Assess which high-temperature steps could move to electric or hybrid solutions as the technology matures.
• Consider thermal storage to smooth supply and protect production continuity.

Key insight: this is where engineering judgement matters most, and where early movers gain an edge.

4. Carbon capture and utilization (CCU)

Where emissions remain, the carbon reduction hierarchy turns to capture. Carbon capture and utilization put CO2 to work, turning it into valuable products and keeping carbon in the loop. The IEA points to recycling captured CO2 into products such as methanol as one route for industrial emissions.

Your opportunity:

• Check whether your CO2 stream could become a feedstock for fuels, chemicals, or materials.
• Weigh the value of utilization against the energy cost of capture.

Why it matters: CCU can turn a liability into a product, but only when the energy balance works.

5. Carbon capture and storage (CCS)

For emissions that cannot be avoided or reused, carbon capture and storage prevent CO2 from reaching the atmosphere by locking it away underground. In a well-built carbon reduction hierarchy, CCS is reserved for genuinely hard-to-abate emissions, it should be used as a last resort.

Your opportunity:

• Identify your unavoidable process emissions, for example in cement or certain chemicals.
• Explore shared transport and storage infrastructure to bring costs down.

Key insight: storage handles what you cannot design out, not what you have not yet tried to.

6. Green certificates and carbon credits

At the bottom of the carbon reduction hierarchy sit green certificates and carbon credits. They address the residual emissions that remain after every feasible reduction. Frameworks such as the Oxford Principles for Net-Zero-Aligned Offsetting and the Science Based Targets initiative are clear that credits should offset residual emissions only.

Your opportunity:

• Use high-quality, verifiable credits only for what you genuinely cannot abate.
• Favour durable carbon removals over avoidance-only credits.

Why it matters: credits sit at the bottom for a reason. They neutralise, they do not decarbonise.

The takeaway

Industrial decarbonization is not a single leap, it is a steady climb. A carbon reduction hierarchy, sometimes called a carbon mitigation hierarchy, helps teams make more informed and durable choices by tackling the highest-impact, lowest-cost options first and reserving offsets for the very top. Not every organisation will use every step. The point is to choose the right ones, in the right order, for your system. At TransitionHERO, we translate the carbon reduction hierarchy into costed, buildable, engineering-ready plans, from energy savings all the way through to capture and beyond.

👉 Curious where your organisation sits on the carbon reduction hierarchy today? Let’s connect.

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