Net zero for business: the practical roadmap

What the target actually commits you to

Net zero is a target about reduction, not about buying your way out of a number. A business at net zero has cut the emissions it controls as close to zero as the site and the technology allow, and balances only the small remainder with permanent carbon removal. That is a different claim from carbon neutral, which has historically allowed a company to leave its consumption where it was and buy credits against it. The standards and the regulator now treat those as two separate things, so the wording you use on your own website carries commercial risk.

The UK target sits in law, but it does not sit on your company. The Climate Change Act 2008 (2050 Target Amendment) Order 2019 requires the net UK carbon account for 2050 to be at least 100% below the 1990 baseline. That duty falls on the Secretary of State and is delivered through five-year carbon budgets. No general statutory duty requires a private UK business to reach net zero by any particular date.

What does reach individual businesses arrives through contracts and reporting instead. PPN 006 requires suppliers bidding for in-scope central government contracts above £5 million per annum including VAT to publish a Carbon Reduction Plan, confirm a commitment to net zero by 2050 in the UK, and report scope 1, scope 2 and five named scope 3 categories. That plan has to sit on your own UK website with a link from a prominent place on the homepage. Large corporate customers pass equivalent questions down their supply chains, and lenders, insurers and incoming tenants increasingly ask for the same evidence.

Set the ceiling honestly at the start. Most UK businesses cannot reach absolute zero on site. High-temperature process heat, heavy goods movements, refrigerant losses and the emissions embedded in what you buy all leave a residual that no amount of on-site plant removes. A plan that states the size of that residual is more useful, and more defensible, than one that quietly assumes it away.

Why the order of the work decides the cost

Net zero programmes usually fail on sequencing rather than on technology. Each step changes the correct size and specification of the step that follows it, so buying out of order means paying for capacity you never needed. Size a solar array against today's unreduced load and you buy generation to feed waste. Fix that array before you have decided about heat, and you undersize it against the electrical demand a heat pump will add two years later.

The sequence below is the one we work through on site. It is deliberately front-loaded with the cheap, unglamorous work, because that is where the fastest returns sit and because it shrinks everything you buy afterwards.

None of these steps has to be taken in a single capital year. The value of holding the order is that each stage produces evidence which makes the next stage cheaper to specify and easier to get approved internally.

• Baseline and measure. Twelve consecutive months of consumption, split by meter and by fuel, converted with the current published emissions factors. Every later decision is judged against this number, so it is worth getting right before anything is specified.
• Cut demand. Lighting, controls, compressed air leakage, heating and cooling setpoints, and out-of-hours load. This band typically removes 8-25% of consumption on a 1-4 year payback.
• Generate. Solar PV sized against the reduced load and the shape of your working day, not against available roof area.
• Store. Battery storage to move surplus generation into the hours you actually consume it, and to shave peak demand charges.
• Electrify heat. Heat pumps where the required flow temperature suits them, modelled before the array size is fixed because they raise electrical demand.
• Electrify transport. Chargepoints sized against fleet duty cycles and the capacity your incoming supply can actually carry.
• Deal with the residual. Last, and only once the reductions above have been made and evidenced.

Getting the scopes right before you set a target

Targets set on a shaky boundary get revised in public, which is worse than setting them late. Scope 1 covers the fuel you burn directly: gas and oil boilers, LPG, owned or leased vehicles, and refrigerant losses from cooling plant. Scope 2 covers the energy you buy as electricity, heat, steam or cooling. Scope 3 covers everything else across your value chain and is divided into fifteen categories under the GHG Protocol Corporate Value Chain (Scope 3) Standard, split between upstream and downstream. For most businesses that are not heavy manufacturers, scope 3 is by far the largest share and by far the hardest to measure.

Scope 2 has a trap worth understanding before you sign an energy contract. The GHG Protocol requires dual reporting: a location-based figure using the grid average, and a market-based figure reflecting the contracts and certificates you actually hold. The UK grid electricity factor is republished each June by DESNZ and has fallen year on year as the grid decarbonises, so convert against the current year's published set rather than a figure carried over from a previous report. Moving onto a renewable tariff changes your market-based number without changing a single kilowatt hour of consumption. That is a legitimate disclosure, but it is not a reduction, and treating it as one is a common way to build a target that cannot survive scrutiny.

For the measurement itself, half-hourly meter data is the most useful input a commercial site has. It shows the base load that runs when the building is empty, the peaks that drive capacity charges, and the overlap between your consumption profile and a solar generation curve. Without it, self-consumption is a guess, and self-consumption is the single assumption that most affects whether a solar business case stands up.

Pick a baseline year you can evidence, state the organisational boundary you are using, and record the method alongside the result. If you later restate the baseline because you acquired a site or corrected a meter error, say so openly rather than quietly reissuing the figure.

Scale, cost and returns across the seven pillars

The economics are driven by the price you avoid rather than the price you generate at. UK commercial electricity typically runs 25-45p per kWh, while exported units under the Smart Export Guarantee earn 4-15p. Every unit you consume on site is therefore worth several times a unit you export, which is why self-consumption, not array size, is the number to design around. Solar PV self-consumption on a commercial site usually lands between 55% and 85%, rising to 80-95% once storage is added.

For sizing, one kWp of solar needs roughly 5-6 m² of usable roof and yields about 900-1,000 kWh per year in the UK. Installed cost runs £600-£1,300 per kWp depending on roof type, access and scale. Heat pumps deliver a coefficient of performance of 3-4 in suitable applications, meaning three to four units of heat for every unit of electricity drawn.

Here is a modelled scenario, offered as a representative example rather than a real project. A distribution site with a 400,000 kWh annual electricity load pays 28p per kWh. Efficiency measures costing £50,000 remove 15% of consumption, saving 60,000 kWh and £16,800 a year, a payback close to three years, and they reduce the array the site then needs. A 250 kWp roof array occupying about 1,250-1,500 m² costs £225,000 at £900 per kWp and generates around 237,500 kWh a year. At 60% self-consumption that displaces 142,500 kWh worth £39,900, with 95,000 kWh exported at 5p worth £4,750. A combined return of £44,650 gives a payback near five years, at the fast end of the six-year figure quoted above because this site self-consumes a high share of what it generates. Adding storage to lift self-consumption toward 85% is a separate calculation, judged on the incremental saving it creates rather than on the headline one.

• Commercial solar: 30 kW to 2 MW, around 6 year payback, £25,000 to £1.5m
• EV charging: 7 kW to 350 kW, around 5 year payback, £3,000 to £150,000 and above
• Heat pumps: 30 kW to 1 MW thermal, around 8 year payback, £30,000 to £750,000
• Battery storage: 30 kWh to 1 MWh, around 7 year payback, £20,000 to £500,000
• Energy management and efficiency: site-wide, around 3 year payback, £2,000 to £100,000
• PPA and procurement: any scale, no payback period because there is no capital outlay, funder-owned
• Wind and CHP: 5 kW to 500 kW, around 9 year payback, £40,000 to £1m and above

Paying for it without waiting on a grant

The dependable money is in capital allowances and avoided cost, not in grant rounds. The Annual Investment Allowance gives 100% relief in year one on qualifying plant and machinery up to a £1m cap per accounting period, and it is the route that delivers full year-one relief on solar PV, battery storage and heat pumps.

This is worth stating plainly because it is widely got wrong. Solar PV is special rate plant. HMRC's Capital Allowances Manual at CA22335 designates all capital expenditure on the provision of solar panels as special rate. Full Expensing is a main rate 100% first-year allowance and therefore does not deliver 100% relief on solar. Special rate expenditure attracts the 50% first-year allowance instead, with the balance entering the special rate pool at the 6% writing down allowance. If your spend fits inside £1m, the Annual Investment Allowance is the answer and Full Expensing is not the relevant route. Confirm the treatment with your own accountant against your accounting period.

Beyond allowances, the Smart Export Guarantee pays for exported units on installations up to 5 MW, with MCS or equivalent certification normally required and the rate, term and conditions set by the supplier you choose. A power purchase agreement removes capital cost entirely: a funder owns and maintains the asset and you buy the generated units at an agreed rate, though you do not own the asset and so cannot claim allowances on it. Asset finance and leasing sit between the two, matching repayments against the saving as it arrives.

On named grants, be realistic about timing. The Workplace Charging Scheme covers up to 75% of purchase and installation costs for chargepoints, capped per socket for up to 40 sockets across all your sites, with the cap raised to £500 per socket for installations completed from 1 April 2026 and the scheme running to 31 March 2027. The Industrial Energy Transformation Fund has run in phases with a minimum grant of £100,000 for large companies, but its most recent competition has closed to applications. The Public Sector Decarbonisation Scheme is open to public bodies only. Phase 4 covers the 2025 to 2028 financial years and closed to new applications in November 2024. The separate EV infrastructure grant for staff and fleets closed to applications on 31 March 2026, with the final installer claim date on 26 May 2026. Build the business case so that it works without a grant, then treat any award as upside.

Where SECR, ESOS and MEES genuinely bite

Three regimes catch most UK businesses, and each uses its own test. Getting the test right saves a great deal of wasted effort, and getting it wrong is a common reason finance teams either over-report or miss a deadline.

SECR applies to quoted companies, large unquoted UK companies and large LLPs. Quoted companies are in scope regardless of size. For unquoted companies and LLPs the size test sits in Part 7A of Schedule 7 to the 2008 accounts regulations, which carries its own figures: you are exempt if you meet two or more of turnover no more than £36m, balance sheet total no more than £18m, and no more than 250 employees. In practice you are in scope if you exceed at least two of the three. There is a trap here worth flagging. The Companies Act size thresholds were uplifted to £54m turnover and £27m balance sheet for financial years beginning on or after 6 April 2025, but Part 7A was not amended to match. A company that has just been reclassified as medium-sized for its accounts can still be a SECR reporter on the older test. Reporting covers UK energy use from electricity, gas and transport fuel, the associated scope 1 and 2 emissions, at least one intensity ratio, the methodology used, and a narrative of the efficiency actions taken in the year. A low energy user consuming 40,000 kWh or less in the UK may omit the detail but must still state that the exemption applies.

ESOS uses a different test again. For Phase 4, you qualify if on 31 December 2026 you have 250 or more employees, or an annual turnover above £44 million together with a balance sheet total above £38 million. Both financial figures must be exceeded for the financial route to apply on its own. Notification of compliance is due by 5 December 2027, audits must cover at least 95% of total energy consumption with up to 5% excluded as de minimis, and ISO 50001 certification is an alternative compliance route. An ESOS action plan follows by 5 December 2028, with annual progress updates in 2029 and 2030.

If you let commercial property, MEES matters too. EPC E remains the minimum standard for non-domestic private rented buildings. The government's June 2026 interim response confirmed that the previously proposed EPC C milestone for 2027 will not be taken forward. From 2031 it is proposed that privately rented non-domestic buildings over 1,000 square metres in England and Wales reach EPC B where cost effective, while smaller buildings stay at EPC E with no new deadline. The existing 7-year payback test and exemptions remain in place. The fabric and heat measures that lift an EPC are largely the same measures that sit at the front of a net zero plan, so the two programmes should be costed together rather than paid for twice.

What makes a claim defensible, and why offsets come last

A net zero claim is a public statement about your business, and the bar for making one has risen sharply. Under the SBTi Corporate Net-Zero Standard, corporate net zero means an absolute reduction of at least 90% across scopes 1, 2 and 3 by 2050 at the latest, paired with a near-term target covering five to ten years. Only the residual final tenth or less is neutralised, using permanent carbon removal and storage.

The distinction that carries the most weight is between neutralisation and compensation. Purchased offsets and avoided-emissions credits do not count toward the 90% reduction. They are compensation, and they sit outside the reduction pathway entirely. A programme that leans on credits early has not reduced anything, however the certificate is worded.

The certification landscape moved in the same direction. ISO 14068-1:2023 superseded PAS 2060, which BSI has since withdrawn. The newer standard requires a clearer reduction pathway before any offsetting and broader inclusion of material scope 3 emissions, closing the gap that allowed offset-led claims under the older approach.

Enforcement has caught up as well. The CMA's Green Claims Code sets six principles: claims must be truthful and accurate, clear and unambiguous, must not omit or hide material information, must make fair and meaningful comparisons, must consider the full life cycle, and must be substantiated. Since 6 April 2025 the Digital Markets, Competition and Consumers Act 2024 has given the CMA direct enforcement powers over unfair commercial practices, with penalties of up to 10% of global turnover. Loose environmental wording on a website is now a legal exposure rather than a marketing decision.

The practical response is straightforward. Publish the baseline, the boundary, the method, the interim target and what you have actually cut. Keep offsetting for the end, for the residual you have genuinely tried and failed to remove, and be explicit about which category any given tonne falls into.

When this does not suit a business, and we will say so

Some sites are not ready, and some never will be for parts of the stack. We would rather establish that at the assessment stage than after a deposit has changed hands.

Tenure is the first filter. On a short lease with no landlord agreement in place, a twenty-five year asset on someone else's roof rarely makes sense, and the split incentive between landlord and tenant needs settling before any specification work is worth doing. Roof condition is the second. If the covering has fewer than about eight to ten years of life left, the array comes off and goes back on at your cost, so re-roofing first is usually the cheaper sequence.

Load shape decides more solar cases than roof area does. A site that runs mainly at night, or only across the winter months, has poor overlap with a generation curve, and storage alone rarely carries the payback when the only value on offer is tariff arbitrage. For heat, the coefficient of performance of 3-4 applies to space heating and low-temperature hot water. Heat pumps do not serve high-temperature process loads, and a plan that pretends otherwise will fail at commissioning.

Grid capacity is the constraint that most often stops EV projects. A weak incoming connection can cap charger output or block export entirely, and a reinforcement quotation from the network operator can exceed the cost of the equipment itself. That question is worth asking early rather than late.

Capital rationing is a legitimate reason to stop after step two. If efficiency work at a one to four year payback is still unfunded, buying generation at around six years is the wrong first purchase. Listed status, planning constraints in conservation areas, and structural loading limits on older roofs each rule out particular measures rather than the whole programme. In every one of these cases the honest answer is a smaller plan, not a rebranded one.

How we approach the work with you

We start with a free, no-obligation assessment of the site. That covers your consumption profile, the fuels you burn, roof or ground area, incoming supply capacity, tenure, and the reporting obligations that genuinely apply to your organisation. The aim is to establish which of the seven pillars are worth modelling for you and in what order, before anyone specifies a single piece of equipment.

Next comes desk feasibility. We model the reduced load after efficiency measures, size generation and storage against that reduced figure and your actual consumption shape, and test the heat and transport electrification cases separately so that each stands on its own numbers. Where an option does not pay back within a sensible horizon, we show you that result rather than removing it from the pack.

You then receive an itemised written quotation. It sets out equipment, installation, commissioning and any grid or structural work as separate lines, with the assumptions behind every saving figure stated so you can challenge them or hand them to your accountant. Capital allowance treatment, export arrangements and any grant route that is genuinely open at the time are set out alongside the costs.

We work UK-wide across the seven pillars set out above. We are MCS certified, OZEV approved, NICEIC Approved, RECC members and TrustMark registered. Panel performance warranties are set by the manufacturer and run to 25 years on the products we typically specify, and our workmanship is covered by an insurance-backed warranty. To begin, use the form on this page or the quote page, and tell us your site type, approximate annual consumption and which pillars you are considering.