Skip to content
HES.
Contact Us
Solutions
Clean WaterControl pathogens, biofilm and cost where conventional treatment failsAir & Infection ControlReduce airborne pathogens and infection risk, with no ozoneEnergyCut energy and recover it from the systems you already runAgriculture & SoilUse less water and fertiliser while protecting yield and soil
Sectors
Healthcare & HospitalsKeep patients safe and your accreditation secure, with infection, Legionella and AMR risk reducedWater & WastewaterStay in consent, and cut the energy and chemicals it takes to get thereCommercial & FacilitiesMeet your EPC and disclosure obligations while running cost and carbon fallAgriculture & Urban FarmingProtect your yield and soil while using less water and fertiliserLocal AuthoritiesMove your estate towards net zero with compliant assets, funded to saveEmerging MarketsBuild investable, accreditation-ready infrastructure on reliable water, sanitation and powerHotels, Hospitality & LeisureKeep guests safe and pools open, with Legionella risk controlled and pool-hall cost cutData CentresCut the cost and water your cooling burns, and harden Legionella control, without touching uptimeFood & Beverage ProcessingCut your trade-effluent bill and hold consent, without touching food safety or uptime
Tools
Where You'd Gain MostPick your sector and what is driving you, and see where you would gain and where to startTrade Effluent Bill EstimatorEstimate your annual trade-effluent bill and see how much is driven by strength, the part you can reduceWater Safety Risk ScorecardAnswer eight quick questions and see your indicative Legionella and waterborne risk band, and where to startCompliance Readiness CheckerPick the duty you answer to, from Legionella to net zero, and see your readiness band and the gaps to closeAeration Energy Cost CalculatorSize the annual energy, cost and carbon of aeration, the single largest energy load in wastewater treatmentCooling Tower Water & Cost CalculatorEstimate the annual water and chemical cost of a cooling tower, and the share that treatment can reduce
Case StudiesInsightsAbout
Contact Us
Local Authorities & Smart Cities

Hit your 2030 net zero target, now the funding has gone, by saving your way there.

Most councils hold a 2030 net zero estate target, but the main capital route closed to new funding in 2025, so every step now has to pay for itself.

We cut energy, water and carbon across your estate and fund it from the savings, leaving cleaner, healthier public buildings and a reportable path to net zero.

Independent evidence: building energy optimisation delivers 15 to 30% savings, the invest-to-save case for a constrained budget.

The challenge

The target stands, the funding has gone, and the estate keeps ageing

Most authorities are committed to net zero by 2030, but the principal capital route has closed, so the estate has to decarbonise out of money it does not have.

The Public Sector Decarbonisation Scheme, the main capital route for decarbonising public buildings, committed around GBP 1bn before closing to new funding in June 2025. The 2030 commitments did not close with it, leaving councils paying for expensive energy rather than frontline services.

The estate that has to deliver those targets is ageing and energy-hungry, wasting roughly 25 to 30% of the energy it uses, the same as the commercial sector. With capital constrained, every intervention now has to show a clear invest-to-save case.

Underneath the carbon target sit statutory duties on let buildings, owned water and energy assets, and social value in procurement. It is a multi-strand agenda landing on a single, stretched budget.

Our approach

How we close the gap without new capital

We cut the running cost of your estate and let the savings fund the carbon reduction, so net zero progress comes from money you are already spending rather than money you no longer have.

Energy, water and air are improved across public buildings and owned assets in place, so operating cost and carbon fall together and the savings build the invest-to-save case. The result is healthier buildings, lower bills and measurable progress against your net zero baseline.

One accountable partner carries the whole multi-strand agenda, from energy and water to cleaner air and even energy recovered from existing infrastructure, so your team is not stitching together a dozen suppliers against a single deadline.

What you get

Net zero progress, funded from the savings

Obligation

Measurable carbon reduction

Cut carbon across the built-environment portfolio, reported against your net zero baseline, with building energy optimisation delivering 15 to 30% savings.

Cost

Fund it from the savings

Build the invest-to-save case the post-PSDS budget demands, so decarbonisation comes out of reduced running cost rather than new capital.

Risk

Healthier public buildings

Cleaner air and water in schools, offices and public buildings, removing up to 99.9% of airborne pathogens with no ozone, and effective disinfection with no toxic residue.

Obligation

Generate energy from infrastructure

Recover energy from the water already moving through your owned infrastructure, with no new civil works, turning existing assets into generation.

Obligation

Strengthen local food supply

Integrate urban and controlled-environment growing that uses less water and fertiliser, supporting local food supply and community social value.

Cost

One accountable partner

A single partner carrying the whole multi-strand agenda, so a stretched team is not managing a dozen suppliers against one 2030 deadline.

Evidence

Evidence behind the invest-to-save case

Independently evidenced, reported against your baseline.

15 to 30%Building energy reduction through optimisation, the invest-to-save case for a constrained budget (US DOE, NREL)
0 cfu/gRecurring waterborne pathogens eliminated in four days in a public water system, confirmed by a UKAS-accredited laboratory
up to 99.9%Of airborne pathogens removed from indoor air in independent testing, with no ozone or harmful byproducts
Reference sites

Results you can take to committee

Public water

A major public water system eliminated recurring pathogens in four days

Bioload fell to 0 cfu/g across every test point after years of failed chemical dosing, confirmed by a UKAS-accredited laboratory, and held on routine maintenance dosing.

Estate water

An estate eliminated biofilm using a fraction of the previous chemical volume

Over a ten-week trial, biofilm and algae were eradicated from the water system with zero Legionella, E. coli or coliforms detected, verified by an independent water-authority laboratory.

Local food

Controlled-environment growing used less water for stronger crops

Independent and third-party trials recorded around 26% less irrigation water with no loss of yield, and visibly stronger root growth, the building blocks of resilient local food supply.

Before you commit

Affordable, low-risk, and visible to residents

The questions a council asks first are the right ones: can we afford it now PSDS has gone, is it safe, and where is the invest-to-save case?

So we build the answer into the work. Decarbonisation is funded from reduced running cost, so it fits a constrained budget rather than competing with frontline services. Every result is measured against your net zero baseline and reportable to members, and a single accountable partner carries the multi-strand agenda. We start with the part of the estate under the most cost or carbon pressure, prove the saving, then scale.

Every result is measured against your net zero baseline.
Questions answered
How do we fund this now PSDS has closed?

The model is invest-to-save: decarbonisation is funded from reduced running cost across the estate, so progress comes from money you are already spending on energy rather than new capital you no longer have.

Is the carbon reduction measurable and reportable to members?

Yes. Savings and carbon reductions are measured against your net zero baseline, so the same work that lowers running cost produces the evidence you report to committee.

Can it improve public buildings as well as cut carbon?

Yes. The same programme delivers cleaner air and water in public buildings, removing up to 99.9% of airborne pathogens with no ozone and disinfection with no toxic residue, alongside lower energy cost.

Do we have to manage many suppliers?

No. A single accountable partner carries the whole multi-strand agenda, from energy and water to air quality and energy recovery, against your deadline.

Does it deliver social value for residents?

Yes. Healthier public buildings, lower running costs and integrated local food growing deliver visible community benefit and support social-value duties in procurement.

Start with the estate under the most pressure

Tell us the net zero gap or the cost pressure you are facing. We will build the invest-to-save case for that part of the estate, in confidence, before you commit.

Request an estate review
Speak to the Team

Tell us your challenge

Tell us the cost, the risk or the obligation you are facing. A senior member of our team will respond, in confidence, with how we would help.

Every enquiry is handled in strict confidence.