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    Energy Efficient Water Treatment Companies

    High-efficiency pumps, blowers, drives, and designs that cut energy intensity across water and wastewater systems.

    124 providers

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    • Filtration or Reverse Osmosis (RO) capabilities
    • Suppliers with utilities sector experience
    • Providers operating in United Kingdom or Netherlands
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    Herrenknecht International Ltd logo

    Herrenknecht International Ltd

    United Kingdom

    Innovative tunnelling technology from Herrenknecht has helped to build new, efficient supply and disposal infrastructures in more than 80 countries worldwide. On the basis of our entire range of methods, we work closely with our customers and develop tailormade technical solutions. Together, we overcome all challenges and create robust, sustainable tunnel structures – within budget and on time, maximizing safety for people and cities. Project requirements and the geological and hydrological conditions determine the optimum machine type. Our product range includes: Earth Pressure Balance (EPB) Shield: Ideal for soft and cohesive soils. Mixshield: Very large excavation diameters can be controlled safely – also in heterogeneous geologies. Single Shield TBM: Ideal for tunnelling through rock and other stable, non-groundwater-bearing soils. Double Shield TBM: Perfectly suited for long tunnelling through hard rock. Gripper TBM: Proven, efficient solution in hard rock. Partial-face Excavation Machine: Directly controllable, easily convertible and adaptable in different geologies. AVN, AVNT, AVND: The best option for microtunnelling: AVN Machines from Herrenknecht. Auger Boring Machines: The ideal technology for short underground drives: HDD Rig: Flexible and environmentally-friendly: for tunnelling in stable, loose soils and rock. Direct Pipe®: This method combines the advantages of microtunnelling and HDD technology. In one step only, a prefabricated pipeline can be installed and the required borehole excavated at the same time. This allows speedy and highly economic installation of pipelines with lengths of more than 1,500 meters. Vertical Shaft Sinking Machine VSM: Unique method for lowering shafts of all kinds in soft and stable soils.

    Construction Plant & Equipment
    Storage Tunnels
    KGN Pillinger logo

    KGN Pillinger

    United Kingdom

    Advanced Pumping & Engineering Solutions With a heritage dating back to 1926, KGN Pillinger is a trusted partner in engineering and manufacturing advanced pumping solutions for the UK’s critical water infrastructure. We combine decades of experience with a progressive investment in technology to deliver robust, reliable, and compliant systems designed for long-term performance. We specialise in the design and in-house manufacture of water and wastewater pumping equipment built to withstand the demands of the water sector. Our proven resilience and expertise have made us a trusted supplier to major UK Water Utilities and the Ministry of Defence. Capabilities Our core capabilities include: Bespoke water boosting systems for network resilience. Packaged pumping stations for sewage and wastewater management. Durable pumping equipment engineered for all sectors. Integrated lifecycle support and maintenance services. Design & Manufacturing Excellence Our end-to-end project management ensures quality and accountability from concept to commissioning: Advanced 3D CAD Design and Building Information Modelling (BIM) support for seamless project integration. In-house fabrication and assembly using 316L Stainless Steel as standard for superior corrosion resistance and asset longevity. A state-of-the-art, fully equipped UK manufacturing facility ensuring quality control and supply chain security. Lifecycle Support for Critical Infrastructure Our dedicated Service Division ensures the operational reliability of your assets: Emergency support and nationwide services to ensure uninterrupted service. Professional installation, commissioning, and planned maintenance contracts. All KGN engineers are CSCS certified, CRB checked, and trained for confined space work, ensuring safe and compliant service on critical infrastructure sites. KIWA Certification KGN Pillinger is the only UK company holding KIWA certification for both: Above-ground AV and EV variable speed booster sets. Below-ground UPOD Underground Plant Room. This dual certification underscores our commitment to meeting the highest industry standards for quality, compliance, and energy efficiency. To discuss your specific project requirements, contact our engineering team: 📞 0208 681 0097 | 📧 sales@kgnpillinger.com | 🌐 www.kgnpillinger.com

    Health & Safety
    Accreditations
    SPP Pumps Ltd logo

    SPP Pumps Ltd

    United Kingdom

    For more than 140 years SPP Pumps has been a leading designer and manufacturer of centrifugal pumps and associated systems, a global principal in design, supply and servicing of pumps, pump packages and equipment for a wide range of applications and industry sectors. This includes water and wastewater treatment, oil and gas production, airports, hotels, construction, mining and for large industrial plants. Low life cost and environmental considerations are fundamental design priorities. With its exceptional expertise and experience, the company’s robust, trusted engineering has provided critical performance across the water industry. As a UK manufacturer, SPP are a leading supplier of clean and wastewater pumps to the Water Industry and has long established Framework agreements with many of the major Utilities throughout the UK and Northern Ireland. SPP Pumps has extensive experience of designing and delivering highly efficient ‘Pump as Turbine’ (PaT) solutions capable of rapid return on investment. Small hydro-electric power production provides a convenient, cost-effective source of renewable energy.

    Asset Maintenance & Rehabilitation
    Active Tunnelling Ltd logo

    Active Tunnelling Ltd

    United Kingdom

    As an industry leader since 1994, Active Tunnelling Ltd (ATL) is the UK’s most experienced independent, micro-tunnelling, auger boring, shaft sinking and pipe jacking company offering a comprehensive range of services to the water and civil engineering industries across the UK & Ireland. More than just a tunnelling company ATL delivers all encompassing projects solutions: whether it is a segmental shaft or complete project management from ‘tunnel’ to final landscaping, ATL delivers flexible, and tailor made solutions to suit any brief. ATL prides itself on its long list of clients that includes amongst others the UK’s leading construction companies and is proud to claim total satisfaction on every job. A dedicated and highly skilled/experienced sixty strong team are at the core of ATL’s success, this weight of experience backed by the UK’s largest independent specialist plant enables ATL to deliver on time every time. Services Our comprehensive range of services allows us to satisfy even the most demanding brief, even with short lead times you can place your trust in us leaving you to focus on other aspects of the project. Tunnelling and pipejacking: 1,000mm – 2,400mm diameter. Micro-tunnelling: 150mm – 900mm diameter. Auger boring: 150mm – 725mm diameter. Grouting. Shaft sinking. Cover slab construction. Timber headings. ATL offer Professional management team with over 30 years experience. Quick mobilisation to site. Technical support/design where required. Achilles UVDB Verify approved company. Quality Assured ISO 9001:2008 Registered Firm Cert. No. A11969. Fast response to enquiries. Fast and efficient service maintaining a high standard of safety. Specialist trenchless plant. A completed project to a high quality at a reasonable price. A willingness to work as one team with all parties to ensure satisfaction.

    Networks - Water Supply
    Contractors
    Air Technology Systems logo

    Air Technology Systems

    United Kingdom

    Air Technology Systems (ATS) have been designing and supplying ventilation and odour control solutions to the water industry for over 20 years. Working closely with the main contractors/M&E Contractors in the industry, we have installed our systems into all major water companies. Our Range of services include: Surveys of existing ventilation and odour control systems. Upgrades, maintenance and modification of existing systems. The design, supply, installation and commissioning of new ventilation and odour control systems. We have our own experienced installation teams. We have our own NIC EIC registered electrical engineers. We work collaboratively with the client to ensure that the system design is optimised and meets the primary objectives e.g TOTEX, Level of performance etc. VENTILATION Our ventilation solutions are a combination of traditional and propriety techniques, including our innovative JETFLO system which maximises the ventilation efficiency and can reduce the overall extract volume, excellent for reducing condensation and ensuring fresh air is delivered where needed, this not only reduces energy consumption, but can reduce the size and cost of odour control units. ODOUR CONTROL Our unique alliance with Europe’s largest manufacturers of specialist odour control products, CMI Europe Environment, is a major strength. We can offer all proven odour control technologies, from carbon filtration and catalytic dry scrubbers, through to bio filtration and chemical scrubbing. Solutions often require a combination of these techniques. All equipment on the odour control plinth is sourced from CMI EE’s state of the art facility and is pre-assembled for inspection prior to dispatch. This provides us with a unique level of quality control. Our specialist rope access division allows us to gain access to places where mechanical scaffold/access is going to be either very difficult or cost prohibitive. Our wide range of expertise design and project management experience, combined with close collaboration with the client is the reason we have an excellent reputation in the industry.

    Accreditations
    Odour Control
    AJ Engineering & Construction Services Ltd logo

    AJ Engineering & Construction Services Ltd

    United Kingdom

    AJ Engineering & Construction Services Ltd provide a wide spectrum of engineering services ranging from steel fabrication and CNC machining to cladding and civil engineering, with our highly experienced team we provide on-time, on-budget quality solutions. From our bases in Forres and Fort William, and a team accustomed to travel we can meet our client’s needs wherever required. Having worked on various water and wastewater treatment projects for the past 25 years we have developed a great working relationship with water companies across the UK. Our in-house capabilities allow us to offer a turnkey service to our clients from reactive maintenance and manufacturing to planned infrastructure and non-infrastructure projects. Many of the projects we undertake in the water sector are within water treatment and wastewater treatment plants where cleanliness is paramount, all our water sector site teams hold certification and Water Hygiene cards. Our range of services collated into one means that we can take on multiple discipline contracts and deliver them as one which provides our clients with a number of advantages. It removes the need to have multiple contractors on site at once. Benefits in cost savings passed down on procuring large amounts of steel for a side wide project. Little risk of dimensional discrepancies between contractors We work alongside framework delivery partners throughout the UK providing the services below; Steel portal frame buildings (design, fabrication, erection & cladding) Design, manufacture and installation of pipe bridges Design, manufacture and installation of site wide access metalwork (walkways, access stairs, ladders etc) Design, manufacture and installation of modular water buildings transportable by road. Design of various process tanks, pipework and pumps. Fabrication of tanks and pipework (stainless and carbon) Mechanical Installation Modular Treatment Buildings and Mechanical Fit-out SR2 rated steel enclosures (quicker than GRP Kiosks) We appreciate how important quality and cleanliness is in the water sector and we are proud that we have completely segregated facilities for stainless steel and carbon steel. In addition to this we are also approved under the regulations 31(4)(A) of the water supply regulations 2016 to supply stainless steel and pipework fabrications to the drinking water sector.

    Networks - Sewerage
    Asset Maintenance & Rehabilitation
    Anglian Water’s @one Alliance logo

    Anglian Water’s @one Alliance

    United Kingdom

    Anglian Water's Integrated Main Works Delivery Programme Anglian Water’s @one Alliance is an integral part of the Anglian Water ecosystem, delivering complex projects across the Water and Water Recycling network. Comprising 8 industry-leading organisations, each contributing specialised expertise, @one efficiently manages over 40% of Anglian Water’s capital delivery programme. Our partners are Anglian Water Asset Delivery, Balfour Beatty, Barhale, Binnies, Mott MacDonald Bentley (MMB), Sweco, Skanska and MWH Treatment. Employees in the @one Alliance are employed across all our partner companies and work together to deliver complex programmes of work. Following the successful delivery of £1.2bn during AMP7, the @one Alliance is now set to deliver approximately £3bn of vital work as part of Anglian Water’s £11bn AMP8 business plan, covering around 750 projects over the next five years. Since our establishment in 2005, @one has grown to a team of over 1,600 employees. And with plans to welcome an additional 300-500 new team members over the next 12-18 months, the Alliance is set to expand even further. If this interests you, then take a look at our jobs page to see the options available to you!

    Networks - Water Supply
    Asset Maintenance & Rehabilitation
    Concrete Repairs Ltd logo

    Concrete Repairs Ltd

    United Kingdom

    Concrete Repairs Limited (CRL) is a specialist asset maintenance contractor who is here to help you with the inspection, repair & refurbishment of your concrete water assets. CRL provide comprehensive repair and refurbishment services tailored to the needs of the water and wastewater sector throughout the UK. These include the inspection, repair, refurbishment and upgrading of service reservoirs, contact tanks, water towers & wastewater treatment plants. With over 65 years of experience, CRL understands the importance of maintaining water quality and supply to customers. Therefore, when planning repairs, we prioritise effective programming of the work and optimal utilization of the assets being repaired. Our choice of repair methodologies and materials always reflects this commitment. At CRL, we pride ourselves on being a reliable partner to the water companies. We collaborate closely with them to identify problems early, quantify the necessary repairs, and establish a timeline for refurbishment. Throughout this process, we focus on ensuring the longevity and optimal performance of the assets. CRL provide proven and successful cost-effective repair and refurbishment options which meet our clients’ objectives of upgrading and increasing the life of their structures. CRL is capable of undertaking individual projects of up to £20M, either under competitive tender, or through Partnering/Framework arrangements. Our broad experience across various sectors ensures we deliver efficient, robust, and technically advanced services.

    Asset Maintenance & Rehabilitation
    Sewer Inspections
    Costain logo

    Costain

    United Kingdom

    Costain works with water and wastewater companies to shape, create and deliver pioneering solutions that improve water quality, affordability and resilience. Population growth, regulatory changes, energy costs and climate change are having a dramatic impact on water usage. The national approach to managing water supply is changing to meet these challenges. The Government and industry regulator are tasked with cutting wastage and preserving an increasingly valuable resource, while protecting consumers from higher water bills. The water sector team offers: Expert input into consultation documents, close work with Government and water companies and innovative delivery, all of which help to minimise costs to water users while meeting national investment needs. A manufacturing mindset: programme optimisation advisory services, standard product development, production controls, whole-life costing and lean delivery processes. Cross-sector best practice: we provide value for our clients by drawing on experience from across the company and by working closely with our decarbonisation experts to drive regional growth strategies. Technology integration: working with some of the UK’s leading asset and data analytics organisations we analyse large volumes of real time data to create greater benefits for our customers through optimised maintenance, pump operation, energy and chemical usage. Current water industry frameworks: Anglian Water – Strategic Pipeline Alliance Severn Trent Southern Water – CMDP JV Thames Water United Utilities – Maintenance Service Provider Yorkshire Water – Technical Services

    Programme Management
    Contractors

    Energy-Efficient Devices and Systems for Water Operations

    Energy consumption typically represents 25 to 40 percent of a water or wastewater utility operating cost: pumping accounts for 60 to 80 percent of that, aeration in activated-sludge plants 50 to 60 percent of plant electrical load. Energy-efficiency interventions target the dominant loads: high-efficiency premium IE4/IE5 motors (per IEC 60034-30-1), variable-frequency drives matching pump curves to dynamic demand, fine-bubble aeration replacing coarse-bubble diffusers (oxygen-transfer efficiency 25 to 35 percent vs 8 to 12 percent), turbocharged blowers replacing positive-displacement (15 to 25 percent energy savings), pressure management on distribution networks (every 1 bar reduction saves about 1 percent energy and 5 to 10 percent leakage), and energy recovery devices on RO trains (PX rotary recovery over 97 percent efficient).

    Sector benchmarks (kWh per m3): conventional drinking-water treatment 0.3 to 0.5; brackish-water RO 0.8 to 1.5; seawater RO 3.0 to 4.5; conventional ASP wastewater 0.4 to 0.7; MBR wastewater 0.8 to 1.5; large-scale anaerobic digestion is net-energy-positive at biogas yields above 0.3 m3 CH4 per kg VS destroyed. ISO 50001 energy-management certification provides the audit framework; ENERGY STAR Portfolio Manager benchmarks plant performance against peers. Typical energy-audit findings reveal 15 to 30 percent achievable savings without major capex, payback typically 2 to 5 years. Renewable integration (solar PV, biogas-to-power, micro-hydro on transmission pipelines) is increasingly cost-competitive at utility scale.

    Aguato lists energy-efficiency providers across premium motors, VFDs, high-efficiency pumps, fine-bubble aeration, turbocompressor blowers, energy recovery devices, pressure-management valves, and solar PV and biogas CHP integrators. Selection criteria: measured kWh-savings guarantees backed by ISO 50001 M&V protocols, performance bonds tied to verified savings, third-party utility-program rebate eligibility (US: utility DSM programs; EU: Energy Efficiency Directive 2023/1791 Article 8 audits), and 24-month operational data from comparable installations.

    Frequently Asked Questions

    What is the fastest-payback energy-efficiency upgrade for a wastewater plant?

    For conventional ASP plants, replacing coarse-bubble diffusers with fine-bubble membrane diffusers plus automated DO control with VFD-driven blowers typically returns 25 to 40 percent aeration energy savings (15 to 25 percent plant total) with 1.5 to 3 year payback. For lift stations and high-service pumping, VFD retrofits on constant-speed pumps with variable demand returns 10 to 25 percent savings, payback 1 to 3 years. For RO desalination, retrofit of pressure exchangers on legacy Pelton-wheel or no-recovery systems delivers 25 to 40 percent specific energy reduction, payback 2 to 4 years depending on electricity tariff.

    What efficiency class motor should I specify?

    IEC 60034-30-1 defines efficiency classes IE1 (standard) through IE5 (ultra-premium). The EU MEPS (Minimum Energy Performance Standards) Regulation 2019/1781 requires IE3 minimum for motors 0.75 to 1,000 kW since 2021, with IE4 required for 75 to 200 kW since 2023. US DOE has equivalent NEMA Premium standards. For variable-speed service (with VFD), specify inverter-duty IE4 with insulation class F and Class B temperature rise per NEMA MG-1 Part 31. Lifecycle cost: an IE4 motor costs 10 to 25 percent more than IE3 but saves 2 to 4 percent energy: payback typically under 2 years at over 4,000 annual run hours.

    How much energy can pressure management save on a distribution network?

    Empirical rule from IWA Pressure Management literature: every 1-bar reduction in average network pressure reduces leakage by 5 to 15 percent (FAVAD N1 exponent typically 1.0 to 1.5 for mixed pipe materials) and reduces burst frequency by 20 to 40 percent. Energy savings track the leakage reduction plus the pumping head reduction at the source: typically 10 to 25 percent pumping-energy savings on networks moving from constant-pressure to dynamic pressure control via PRVs with flow-modulated setpoints. Payback for a PRV plus telemetry retrofit on a 5,000-connection DMA is typically 2 to 4 years.

    Are utilities eligible for grid incentives for energy efficiency?

    Yes, in most major markets. US: utility DSM (demand-side management) programs offer rebates of 0.05 to 0.20 USD per kWh saved annually for prescriptive measures (motors, VFDs, lighting) and custom incentive payments up to 0.30 USD per kWh for engineered projects (aeration optimization, pump curve matching). EU: Energy Efficiency Directive 2023/1791 obligates large enterprises (1,000-plus TOE per yr or 10M EUR turnover) to implement audits and energy-management systems; member-state white-certificate schemes (Italy TEE, France CEE) pay 5 to 15 EUR per MWh of certified savings. Always model project economics with and without incentives: incentives typically reduce simple payback by 30 to 50 percent.

    Case Study·Municipal wastewater treatment
    Challenge

    A 200,000 PE activated sludge plant in the North West England operated on fixed-speed positive-displacement blowers with constant-pressure aeration. Electricity accounted for 62 percent of site OPEX, with aeration representing 55 percent of that. An Ofwat AMP8 totex efficiency commitment required a 15 percent energy reduction by 2030.

    Approach

    Replaced three fixed-speed PD blowers with two turbo blowers (oil-free, VFD-driven, IE4 motors) sized for 30 to 100 percent of design airflow. Installed online ammonia and DO sensors at three points in the aeration lanes, linked to a dissolved-oxygen control algorithm with automated modulating inlet guide vanes on each blower. Replaced coarse-bubble diffusers with fine-bubble membrane disc diffusers increasing SOTE from 9 percent to 28 percent.

    Outcome

    Aeration energy fell 38 percent (from 3.2 to 1.98 kWh per kg BOD removed). Site total electricity consumption fell 22 percent. Capital cost of 1.85M GBP recovered in 3.1 years at 0.18 GBP per kWh. Ofwat totex efficiency commitment exceeded. Effluent quality improved (ammonia 95th percentile reduced from 3.2 to 1.1 mg/L) due to tighter DO control.

    Questions to Ask Shortlisted Providers

    1. 1

      What measured specific energy consumption (kWh per m3 or kWh per kg BOD removed) does your equipment achieve in comparable UK reference plants, and can I visit one?

      Manufacturer efficiency claims are made under ideal test conditions. Field-verified data from a comparable UK plant (same technology, similar loading, similar tariff) is the only reliable basis for financial modelling. A supplier who cannot provide a site visit reference should be treated with caution.

    2. 2

      What IEC efficiency class is the motor, and is it inverter-duty rated for VFD operation?

      UK MEPS (Minimum Energy Performance Standards, SI 2021/745 implementing EU 2019/1781) requires IE3 minimum from July 2021 and IE4 for 75 to 200 kW from July 2023. Motors driven by VFDs are subject to additional voltage stress and must be inverter-duty rated per NEMA MG-1 Part 31 or IEC 60034-17 to prevent premature insulation failure.

    3. 3

      What ISO 50001 measurement and verification protocol will you use to demonstrate guaranteed energy savings?

      Energy savings guarantees without an agreed M&V protocol are unenforceable. ISO 50001 IPMVP Option A (stipulated measurements) or Option B (all parameter measurement) should be agreed before contract signature, specifying baseline conditions, measurement boundary, and independent verification process.

    4. 4

      Are your turbo blowers or VFDs eligible for UK utility DSM rebate schemes, and will you support the rebate application?

      UK water utility energy efficiency projects may attract ESOS (Energy Savings Opportunity Scheme) compliance credit and some regional electricity network company DSM rebates. Supplier support for the rebate application can recover 5 to 15 percent of project CAPEX. Confirm eligibility and the application process before award.

    5. 5

      What is the noise output at 1 metre and at the site boundary, and have you modelled compliance with BS 4142:2014 for the nearest noise-sensitive receptor?

      Turbo blowers and new diffuser systems change the acoustic profile of a WWTP. Control of Noise at Work Regulations 2005 apply to operator exposure; BS 4142:2014 governs community noise impact. Planning conditions on many WWTPs include site-boundary noise limits. A noise assessment before purchase avoids post-installation noise enforcement from the local authority.

    What Drives Cost in This Category

    Motor efficiency class upgrade

    Upgrading from IE2 to IE4 motors on a 100 kW pump running 8,000 h/year at 0.18 GBP per kWh saves approximately 4,000 to 6,000 GBP per year. IE4 motor premium over IE2 is typically 3,000 to 8,000 GBP: payback 1 to 2 years. This is the highest return-per-pound energy efficiency measure in water operations.

    VFD retrofit on constant-speed pumps

    VFD retrofit on a 75 kW pump with 30 percent part-load duty saves 20 to 30 percent energy (cube law applies where flow variation is accommodated by speed reduction). Installed cost 5,000 to 15,000 GBP including motor protection filters. Payback 1.5 to 3 years at UK industrial tariffs.

    Fine-bubble aeration diffuser replacement

    Replacing coarse-bubble diffusers with fine-bubble membrane disc diffusers increases standard oxygen transfer efficiency (SOTE) from 8 to 12 percent to 25 to 35 percent per metre of submergence. Capital cost 50,000 to 250,000 GBP for a 50,000 PE plant. Energy savings 25 to 40 percent of aeration cost. Payback 2 to 4 years.

    Online DO and ammonia control instrumentation

    Online dissolved oxygen and ammonia sensors enabling cascade aeration control cost 15,000 to 40,000 GBP installed per lane but unlock 10 to 20 percent additional energy savings beyond hardware upgrades alone by precisely matching airflow to biological demand. Without control optimisation, fine-bubble diffusers and turbo blowers often run at over-aeration setpoints.

    Key Regulations & Standards

    UK MEPS -- IE3/IE4 Motor Efficiency Requirements

    The Ecodesign for Energy-Related Products and Energy Information Regulations 2021 (SI 2021/745) implement EU Regulation 2019/1781 in UK law, requiring IE3 minimum efficiency for motors 0.75 to 1,000 kW from July 2021. IE4 is mandatory for 75 to 200 kW motors from July 2023. Non-compliant motors cannot be placed on the UK market. Water utility procurement must specify at minimum IE3 for all motor replacements.

    ESOS (Energy Savings Opportunity Scheme) Phase 3

    Large water companies (turnover above 43M EUR or 250-plus employees) must comply with ESOS Phase 3 (compliance deadline December 2023). ESOS requires a qualified lead assessor to audit at least 90 percent of energy consumption and identify cost-effective energy-saving opportunities. Identified measures (including pump, blower, and aeration upgrades) must be documented and submitted to the Environment Agency. Non-compliance penalties up to 50,000 GBP.

    Environmental Permitting Regulations 2016 -- Energy Performance Conditions

    Environmental Permits for large wastewater treatment works increasingly include energy performance conditions aligned with BAT under the Industrial Emissions Directive (retained in UK law). BAT-AELs for energy consumption (kWh per m3 treated) set reference benchmarks. Permits require reporting of annual energy consumption and specific energy per m3, creating accountability for energy efficiency performance.

    Ofwat AMP8 Totex Efficiency -- Energy as Regulated Cost

    Ofwat's PR24 Final Determination sets totex efficiency challenges for water companies in AMP8 (2025 to 2030). Energy efficiency investments are assessed as totex: efficient investments qualify for inclusion in the regulatory asset base. Ofwat expects water companies to demonstrate energy-efficiency improvement trajectories and may disallow inefficient energy spend from the allowed revenue base. Companies must report energy consumption per unit of output in their annual performance report.