RSK Group Limited has released its annual report and consolidated financial statements for the period from 1 April 2024 to 6 April 2025, showing another year of sustained financial growth across its global operations.

The company reported revenue of £2.2 billion, an increase of 21% year-on-year, and net fee income of £1.1 billion, up 13%. EBITDA reached £122.4 million, a 3% rise on the previous year, while cash generated from operations totalled £105.8 million – up 12%, representing an 86% free-cash-flow conversion rate. Cash at bank increased by 34% to £176.8 million.

Founder and Chief Executive Officer Alan Ryder said that RSK’s success reflects its positive global impact and commitment to sustainable development.

RSK Group Founder and CEO Alan Ryder

RSK is delivering a profoundly positive impact in the world and, in a time when the need for sustainable change has never been greater, it’s imperative that we continue to develop solutions to transform our world, said Alan.

Despite global uncertainty around the sustainability agenda, particularly in the United States, Ryder noted that market demand across RSK’s operating regions remains strong and continues to grow.

Interim Chief Financial Officer Frank Herlihy added that the company’s financial performance demonstrates resilience and focus:

RSK Interim Chief Financial Officer Frank Herlihy

RSK continues to invest heavily in business growth, both organically and through acquisitions, to deliver long-term value creation. This investment-led approach strengthens our capabilities, expands our geographic footprint and positions RSK as a global leader.

Over the past five years, RSK has increased its annual revenue from £275 million in 2020 to more than £2 billion, achieving a compound annual growth rate of 52%.

Strong Performance Across Core Markets

RSK focuses on four core markets critical to a sustainable future – water, energy, infrastructure, and the built and natural environment. In FY25, the water sector accounted for 43% of total revenue, growing by 25% year-on-year. Energy and environment-related sectors each contributed 21% and grew by 9% and 14% respectively, while infrastructure was the fastest-growing segment with a 36% rise over the previous period.

Growth Driven by Collaboration and Acquisition

Ryder highlighted the company’s “lily pad” model, which brings together RSK’s 200 specialist businesses to encourage collaboration, vertical integration and cross-selling:

Our businesses are recognised leaders in their respective fields. When multiple ‘lily pads’ come together and overlap, they generate added value for our clients and our people, he said.

During the financial year, RSK completed 11 acquisitions across the UK, Australia and Africa, welcoming new companies including eb7, Apollo Strategic Communications, 3BM Group, Kendall Kingscott, Edge Impact, Pegasys, N-Able Group and Elsym Installations.

Quick Reference Links

• RSK Group
• RSK Annual Report 2025
• RSK Sustainability Report 2025

RSK Reports Strong Financial Performance and Growth Across Core Sustainability Markets
H2O Team

A retained water supply agreement is helping to safeguard continuous operations at one of the UK’s longest-serving energy-from-waste plants.

London Energy, which processes much of North London’s non-recyclable waste and generates electricity for the National Grid, relies on demineralised water to keep its boilers and turbines operating.

With limited onsite storage capacity, any delay in replenishment risked halting waste processing entirely – with potential knock-on effects including increased landfill disposal, financial penalties and interruption to electricity output.

To address this, London Energy signed up to a new WaterTight assured response package from Water Direct, which guarantees mobilisation of two dedicated water tankers within 14 hours of a call being placed. Initially agreed as a two-year arrangement, the contract has since been extended to three years, providing continuity until a planned infrastructure upgrade in 2027.

Ben Hillyear, Operations Manager at London Energy, said: “This was an essential service to put in place. Given the specialist nature of the product, we knew that there could be long lead times from the point of call to delivery.

“Having a guaranteed response time enabled our production team to plan better and ensure the facility continued to produce power.”

The arrangement reduces the operational risk of downtime, while ensuring waste continues to be diverted from landfill and electricity production remains uninterrupted.

Bill Wootten, Director of Business Development of Water Direct said: “WaterTight is designed for sites where water supply is critical to continuous operations. By setting guaranteed response times and allocating resources in advance, we provide assurance that production can continue even if primary sources are disrupted.

“For London Energy, that means avoiding stoppages and maintaining service for the community it supports.”

The Edmonton-based facility plays a key role in North London’s waste strategy, converting non-recyclable waste into energy and helping to meet landfill diversion targets. While it operates a closed-loop water system to recycle demineralised water, the combination of ageing infrastructure and limited storage made a proactive contingency essential.

By securing guaranteed supply through Water Direct, London Energy has strengthened its resilience planning and ensured stability until the upcoming site upgrade.

The agreement highlights the value of pre-arranged contingency measures in reducing risk for industrial operations dependent on specialist inputs.

Water Direct continues to work with organisations across sectors to help them strengthen resilience and ensure continuity where water is critical to operations.

Guaranteed water supply keeps vital energy facility running <h2 class='sub-title'>Emergency response solution helps waste-to-energy plant avoid costly downtime</h2>
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UK Power Networks Services has signed a new four-year agreement with Southern Water Services to continue providing power support across the company’s 400 sites in the south of England.

The contract, which began on 1 April 2025, ensures continued high and low voltage maintenance and 24-hour support. It builds on a relationship that has been in place since 2008.

Southern Water provides water services to around 2.7 million people and wastewater services to more than 4.7 million across Kent, Sussex, Hampshire and the Isle of Wight. Reliable power supply is essential to maintain these services for households, businesses and communities in the region.

David Mitchell, Director at UK Power Networks Services, said: “We look forward to continuing our work with Southern Water. Ensuring reliable power supply to water and wastewater sites is critical for the resilience of services that millions of people depend on.”

Southern Water added that the continued agreement supports its commitments to maintain service reliability and meet the needs of customers across its region.

Background

UK Power Networks Services works with clients across transport, defence, water and logistics, delivering energy technology consulting, design and build, and asset management services. Current projects include High Speed 1, Network Rail, London Underground, the Ministry of Defence, Felixstowe Port and Canary Wharf.

Quick Reference Links

• UK Power Networks Services
• Southern Water

Renewed Power Agreement to Support Four Years of Reliable Water Supplies
H2O Team

Voith Hydro has successfully completed factory acceptance tests (FATs) for critical components of Australia’s Snowy 2.0 pumped storage project, marking a significant step forward in the delivery of one of the world’s largest clean energy developments.

Testing took place across two continents. In Shanghai, generator components — including rotor poles and stator bars — underwent rigorous inspections to verify insulation consistency, lamination quality and magnetic flux distribution. Meanwhile, in Heidenheim, Germany, digital and hydraulic governors for Units 5 and 6 were put through their paces, marking the first use of bus-controlled proportional valves on an Allen-Bradley PLC platform.

Both FATs were completed on schedule, with positive feedback from the customer confirming technical precision and quality management. More than 30 Voith engineers and technicians contributed, building valuable expertise for the commissioning phase in Australia.

Snowy 2.0 is a cornerstone of Australia’s transition to renewable energy. Once completed, the scheme will provide critical pumped storage capacity, supporting grid stability and the integration of wind and solar power.

Voith Hydro Reaches Key Milestone for Snowy 2.0 Pumped Storage Project
H2O Team

In Italy only one out of ten of the over 2,000 projects funded by the European Regional Development Fund (ERDF) related to water has been completed. For the 2021–2027 cycle, only 5 out of 542 (1%) are finished. These figures, compiled by the Centro Studi Enti Locali, will be presented at Accadueo, the international water service trade fair, taking place from October 7–9 at BolognaFiere

Only 11% of the 2,023 projects funded by the European Regional Development Fund under the 2014–2020 programming cycle and aimed at water resources and wastewater were actually completed. These are some of the findings to be presented and discussed at the upcoming edition of Accadueo, for over thirty years the only trade fair in Italy exclusively dedicated to the civil and industrial water sector, will take place from October 7 to 9 at BolognaFiere, organized by BolognaFiere Water&Energy, based on data from Opencoesione (Presidency of the Council – Department for Cohesion Policies and the South) and updated as of April 30, 2025*.

According to the analysis by the Centro Studi Enti Locali, over 8 out of 10 projects (83%) are still in progress, and 58 (3% of the total) have not yet been started. In the previous 2007–2013 programming cycle, only half of the planned water-related projects were completed (1,145 out of 2,273). In the cycle before that (2000–2006), the completion rate was significantly higher: 1,402 out of 1,726, or 81% of the total.

“Modernizing Italy’s water networks and developing management models are now top priorities,” stated Paolo Angelini, CEO of BolognaFiere Water&Energy. “Accadueo will be an important opportunity for concrete dialogue between institutions and businesses. Only through discussion and a shared vision can we overcome the chronic inability to fully utilize cohesion funds and direct investments toward structural, sustainable, and timely interventions.”

“We must act urgently on the distribution, treatment, and efficient use of water resources,” added Nicola Tonveronachi, CEO of the Centro Studi Enti Locali, “especially in a context marked by climate change and evolving civil and industrial needs coexisting with long-standing deficiencies in Italy’s water infrastructure”.

The most common types of projects include modernization, extension, or maintenance of urban water distribution networks; collection and disposal of domestic and industrial wastewater; construction or upgrading of wastewater treatment plants; infrastructure for water withdrawal and transport for civil and industrial use; and projects supporting agriculture and efficient irrigation practices.

Data from the current 2021–2027 programming cycle show a decrease in the number of water-related ERDF-funded projects (542 compared to 2,023 in the previous cycle). This reduction is likely influenced by the National Recovery and Resilience Plan (PNRR), which allocated significant resources to the water sector: €2 billion for primary water infrastructure to ensure supply security and €1.92 billion for reducing losses in water distribution networks, including digitization and monitoring. As of now, only 5 projects from the current cycle have been completed (1% of the total), 366 are underway (68%), and nearly one in three (168 out of 542) have not yet started.

*Research titled “The Future of Water: Which Management Models Have Proven Most Efficient in the Management of Water Resources,” commissioned by BFWE.

Water Infrastructure: Only 11% of “ERDF” 2014–2020 Projects Completed
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Aberdeen-based ZOEX Ltd, the UK’s only female-founded wave energy company, is riding a wave of investment success after securing £531,000 funding including investment from Equity Gap, one of Scotland’s leading angel investment syndicates, The University of Strathclyde and Scottish Enterprise.

The private investment by Equity Gap has been matched by Scottish Enterprise unlocking a contribution of £196,000 from Innovate UK, enabling the company to scale development of its wave energy converter technology.

The 100kW full scale prototype, which was tested in Aberdeen Harbour last year, will now be transported to Ordu, Turkey and tested there for a year to assess the seasonal performance differences.

These newly secured funds will support long-term sea trials to validate the technology’s reliability in real-world marine environment before commercially deploying at the end of 2025.

Founded by award-winning entrepreneur, CEO Ash Penley, ZOEX is on a mission to help the blue economy to decarbonise by replacing diesel generators with clean, cost-effective wave power. Designed with versatility in mind, the ZOEX system can be deployed across various blue economy sectors such as aquaculture fish farms, offshore wind, oil and gas, and remote ports and harbours.

ZOEX is supported by Glasgow-based Malin Group, experts in end-to-end marine solutions, and Applied Renewables Research Ltd, which brings wave energy modelling and commissioning expertise from prototype to commercialisation. International interest is growing, with vital project partner OREN Energi A.S, a renewable energy subsidiary of Ordu Municipality in Turkey; providing the project with a consented site in Ordu which has ideal met-ocean data essential for testing the technology.

To date, Penley has raised over a million in public and private funding for the venture. Her journey from a career in oil and gas to founding a clean-tech company in a male-dominated industry is a story of innovation, grit, and purpose. Commenting on the project, she said:

“This investment is a huge step forward for ZOEX and for women in marine energy. Our technology has been designed not just to survive at sea, but to thrive efficiently, sustainably, and at scale. We’re grateful for the latest backing from Equity Gap, Scottish Enterprise and The University of Strathclyde, who share our vision for a cleaner, more resilient energy future.”

Fraser Lusty, Managing Director of Equity Gap added: “At Equity Gap, we’re focused on backing bold innovation and exceptional founders. ZOEX ticks both boxes. Ash has built a solution with global potential, and we’re proud to play a part in helping this technology reach the market.”

Derek Shaw, Director of Entrepreneurship and Investment at Scottish Enterprise said “Our investment in Zoex underscores our commitment to creating an internationally competitive energy transition industry in Scotland. By supporting ambitious companies in areas such as wave energy we can help them drive innovation and capitalise on the significant economic opportunities linked to the shift from the production and consumption of fossil fuels to sources of renewable energy.”

ZOEX’s innovative link-arm design allows it to mount onto any marine structure, giving it a major edge over competitors focused on single-use applications. Its compact form and survivability features – including impact-resistant floats, submerged survival mode, and no mechanical end stops – make it ideal for harsh sea conditions.

Wave energy is unique because it is the most concentrated form of renewable energy on earth, with power density much higher than wind and solar energy. With the global wave and tidal energy market projected to grow from $1.3 billion in 2024 to $19.8 billion by 2032, ZOEX is positioning itself to lead in both niche and large-scale markets. The system has been engineered to deliver near-term economic returns while laying the foundation for longer-term grid-scale deployment.

For more information, visit the ZOEX website here.

ZOEX, first female-founded wave energy company, secures £531k funding to propel breakthrough clean tech
H2O Team

A UK process filter manufacturer is ramping up its reach in the global green energy sector with a first-time presence at the Hydrogen Live 2025 industry showcase.

Amazon Filters will highlight the benefits of its liquid and gas filtration solutions for mission-critical electrolysis technology at the forthcoming two-day conference and expo in Liverpool.

A key focus is how the correct choice of filters and housings can directly aid the deployment of green hydrogen in activities such as energy production, transport and fleet management, chemicals manufacture, building design and steel making.

On the Amazon Filters stand will be mechanical engineer and Sales Manager Riaz Esmail, whose team delivers technical proposals and quotes, and Tom Davies, Business Development Executive.

Riaz said: “Green hydrogen has the potential to help industries across the world decarbonise as they move towards renewable solutions for production, transport and storage.

“Thanks to our investment programme in ‘quick and able’ manufacturing capacity, we are ideally positioned to design, make and deliver highly bespoke filter vessels precisely in line with industrial need.

“Tom and I will be on hand to discuss how our solutions support water, potassium hydroxide and gas filtration, all involved in hydrogen production.

“We’ll be demonstrating a range of filter cartridges and corrosion-resistant housings we are confident will interest Hydrogen Live delegates.”

Green hydrogen is increasingly seen as a sustainable method of energy storage that can generate electricity when demand requires, using fuel cells.

In AEL (alkaline electrolysis), filtration of the electrolyte involved – an alkaline mix of water and caustic potash – is critical to maintaining the highest conversion efficiency.

The design of the housings is just as crucial to ensure they can withstand the corrosive nature of the high-performance AEL so as to avoid stress corrosion cracking, minimise maintenance costs and maximise in-service life.

Hydrogen Live is an annual conference, exhibition and networking event dedicated to uniting the hydrogen value chain and accelerating the hydrogen economy.

Organised by Foresight Events, Hydrogen Live takes place at the Titanic Hotel Rum Warehouse, Stanley Dock, Liverpool, on 5 and 6 February 2025.

For more information, visit  https://www.foresight.events/hydrogen.

Process filter maker targets green energy sector at Hydrogen Live 2025
H2O Team

At the 2024 IDRA World Congress show this week, Energy Recovery, Inc. was honored with The Breakthrough Innovation Award for Most Innovative Company in Desalination Technology. The award, announced at the IDRA World Congress Gala Dinner, “recognizes the pioneering efforts and transformative impact of a company, utility, or agency at the forefront of desalination technology.”

Energy Recovery has been the trusted gold standard in energy recovery solutions for the seawater reverse osmosis desalination industry for over a decade, thanks to the groundbreaking PX® Pressure Exchanger® technology.

According to their award submission, Energy Recovery has deployed more than 35,000 pressure exchangers across seven continents, helping serve clean water to more than 70 million people per day.

The PX reduces energy consumption in SWRO desalination facilities by up to 60%, translating into an estimated $6.3 billion savings in energy costs each year for our customers.

“We’re truly honored to be recognized as an innovator in the desalination industry,” said Rodney Clemente, Senior VP of Water at Energy Recovery. “And with continued advancements and additions to our product line—like the Q400, the Low-pressure PX and the Ultra high-pressure PX Series—we are helping to push the industry forward towards a more sustainable and energy efficient future.”

The PX Q400 is a notable innovation for Energy Recovery in recent years. It is the company’s highest performing and highest-capacity PX available for seawater reverse osmosis (SWRO) desalination and industrial wastewater facilities, with a peak efficiency of up to 98%.

At this year’s IDRA World Congress, in addition to exhibiting, Energy Recovery also led important industry discussions, including a curated panel titled “Innovative Pathways: Navigating the Energy-Sustainability Nexus in Desalination”.

For more information about Energy Recovery, visit their website at https://energyrecovery.com.

Energy Recovery Wins “Breakthrough Innovation Award” at IDRA World Congress
H2O Team

Valencia (Spain) will be hosting the 19th WEX Global from February 10 to 12, 2025. The event, entitled Water, Energy & Climate Change. Partnerships for Progress to a World of Water Abundance, is set to bring together more than 90 experts from over 45 countries at one of the leading international water and energy sector meetings.

According to Jaime Barba, the CEO of IDRICA, “WEX continues to be one of the key meeting points for the water sector. The quality of the debates and the large number of attendees are highly conducive to boosting synergies and driving learning”. The event is divided into conferences, meetings and networking sessions, which are ideal to harness the opportunities created by the interconnections between the circular economy and holistic digital strategies to mitigate the impacts of climate change, the energy transition and digital transformation in water resource management. Along these lines, Mark Barker, the CEO of WEX Global, stated: “it is essential to have a forward-looking vision in digital management as this continues to make a difference and embodies the transformational spirit that we aim to drive every year at WEX Global”.

Key topics on the agenda at WEX include integrated water resource management, water intelligence, next-gen urban management with NB-IoT, digital solutions for energy efficiency, sustainable urban water management, and water reuse and optimization in agricultural production systems. Climate funding and the power of partnerships to unlock the potential of sustainable development are also on the programme, and the Leaders Forum will be discussing “Resilient Watersheds: Strategies for a Sustainable Future”.

Another highlight of the event is a visit to some of the facilities in which Xylem Vue is already up and running, giving attendees the chance to learn how the platform works first hand.

On Tuesday, February 11, the Gala Dinner will be held, serving as the prelude to the presentation of the WEX Global Awards, which focus on recognizing best practices in circular economy strategies in the sector. The categories for 2025 are:

• Innovation in Water Circularity
• Innovation in Decarbonizing
• Innovation in Digitalized Water Management.
• Innovation in Building Healthy Watersheds

Xylem Vue, Digital Transformation Partner

The event has once again chosen the Xylem Vue platform as its Digital Transformation Partner for WEX Global 2025, a meeting in which digital transformation is expected to play a prominent role. Attendees will be able to gain first-hand insights into how this tool works and discover its remarkable versatility. Idrica will also be co-hosting the event, while Global Omnium will be attending as a Host Utility Partner.

The world’s most influential water and energy experts to meet once again at WEX Global 2025
H2O Team

Floating solar is set to become a key source of renewable energy with the potential to produce 9343 terawatt hours (TWh)* globally, equivalent to meeting Europe’s electricity needs three times over.

A source of vast untapped potential, waterbodies such as reservoirs and lakes are a vital resource providing us with many benefits, but with the emergence of floating solar, they can also supply us with clean energy. Amid ongoing pressure on food and land security, and water resources becoming increasingly scarce, floating solar also provides a unique opportunity to help address these concerns.

This is the view of the team behind a new joint venture between RSK and Nova Innovation –AquaGen365 – leading the charge in designing and installing floating solar power stations. Its first floating solar project is already up and running in the Port of Leith in Edinburgh, powering Forth Ports’ headquarters with clean, low-cost renewable energy.

AquaGen365 combines the RSK Group’s global reach across more than 200 environmental, engineering and technical service companies in 40 countries with Nova Innovation’s world-leading expertise in marine energy. Collectively, AquaGen365 has more than 20 years’ experience in the development of renewable energy through the deployment of tidal stream, onshore wind, ground-mounted solar photovoltaic (PV) and hydro power technologies.

David Taylor – RSK, Director

RSK Director David Taylor said: “Floating solar provides clean, predictable, low-cost energy using reliable and bankable technology that offers an alternative solution to ground-mounted and rooftop solar. It makes a compelling argument for cost-competitive and decarbonised energy generation where land use is not a viable option. Other benefits include a quick-to-deploy modular design with short lead times; scalability to match energy demands; deployment in both marine and freshwater environments; and excellent water conservation benefits (potential to reduce surface evaporation by 42%**).”

David added: “Floating solar will benefit many sectors: in particular, enabling sustainable irrigation in the agricultural sector, helping to achieve carbon net zero targets within the water industry, providing renewable energy to power industrial sites and complexes and driving the push for ‘greener’ ports and harbours.”

Simon Forrest – Nova Innovation, CEO

Nova Innovation CEO Simon Forrest commented: “Floating solar presents a massive step forward in the quest for clean, renewable energy. Its main advantage is that it can be installed quickly at scale, particularly in areas where land is scarce or expensive. In line with the commitment made at COP28 to triple renewable energy capacity globally by 2030, floating solar is a low-cost, accessible solution that can have a real impact on reducing climate change. The complementary skills of RSK and Nova combine perfectly to help achieve these global targets.”

Nova’s floating solar technology is proven to operate in all conditions, including weathering the storms and harsh conditions of the Scottish winter. Using this technology, AquaGen365 is poised to transform the floating solar landscape, setting new standards for innovation and sustainability.

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RSK and Nova Innovation join forces to deliver floating solar
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