Southern Water
Finance Business Partner
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Finance Business Partner – Wastewater Capital Delivery
Location: Durrington, Worthing Contract Type: Permanent Hours: Full time, Monday to Friday (flexible working options considered) Salary: Up to £65,000 per annum, depending on skills and experience, plus benefits
Closing Date: 10 July 2026
About the Role
There has never been a more important time to join Southern Water. As we move into AMP8, we are delivering one of the most ambitious capital investment programmes in the industry, focused on improving environmental performance, service resilience, and long-term affordability for customers.
As a Finance Business Partner – Wastewater Capital Delivery, you will play a critical role supporting the delivery of this multi-year, regulated capital programme. Working at the heart of the Wastewater Capital Delivery function, you will:
- Ensure investment decisions are robust, efficient and aligned to regulatory commitments.
- Actively support the business to challenge costs, drive efficiencies, and deliver value for money.
- Operate in a fast-paced, delivery-focused environment, requiring strong financial leadership alongside regulatory scrutiny and cost pressures.
You will work closely with senior operational, engineering, and programme leaders, acting as the trusted finance voice across AMP8 delivery. This includes providing clear insight, constructive challenge, and forward-looking analysis to support confident decision-making.
Responsibilities
Key Accountabilities
- Act as the Finance Lead for Wastewater Capital Delivery, providing trusted financial advice and insight to senior stakeholders across AMP8 programmes and portfolios.
- Own the AMP8 wastewater CAPEX budget, including:
- Profiling, in-year forecasting, and long-term financial outlook.
- Clear articulation of risks, opportunities, and delivery confidence.
- Support the business to challenge costs and drive efficiencies, ensuring:
- Capital solutions are affordable, efficient, and aligned to Ofwat’s value for money expectations.
- Provide robust financial input into:
- Investment decisions, business cases, and change control.
- Spend alignment with regulatory allowances and outcomes.
- Deliver high-quality financial analysis, including:
- Scenario modelling, cost sensitivity, and options appraisal for prioritisation and delivery trade-offs.
- Produce, develop, and improve AMP-focused CAPEX and performance reporting, providing insights on:
- Spend, forecast outturn, efficiency delivery, and regulatory performance.
- Strengthen financial governance and cost assurance across capital programmes and projects, recommending:
- Corrective actions where delivery or affordability risks arise.
- Partner with engineering, delivery, commercial, and asset teams to embed:
- Strong cost management, control assurance, and efficient ways of working.
- Support continuous improvement of forecasting, reporting, and financial processes to enhance:
- Transparency, challenge, and responsiveness throughout AMP8.
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What You’ll Bring to the Role
Essential Experience & Skills
- Experience in Finance Business Partnering, Management Accounting, FP&A, or a similar commercial finance role, with:
- Demonstrable exposure to capital investment or regulated delivery environments.
- Strong analytical skills, with the ability to:
- Interrogate complex, imperfect data and provide clear, credible insights and challenge.
- Proven ability to:
- Constructively challenge costs without compromising outcomes.
- Influence delivery decisions and support efficiency opportunities.
- Excellent communication skills, with confidence to engage:
- Senior operational, engineering, and programme stakeholders.
- Capacity to:
- Work autonomously, manage competing priorities, and make sound judgments in a fast-paced environment.
- Strong commercial awareness and understanding of project, programme, or asset-Based delivery drivers.
- Advanced Microsoft Excel skills, alongside strong capability across core Microsoft Office tools.
Desirable Qualifications & Experience
- A professional accounting qualification (or qualification in progress).
- Experience within utilities, regulated environments, infrastructure, or asset-intensive industries, particularly CAPEX-heavy organisations.
- Understanding of:
- Ofwat regulation, AMP frameworks, and cost assessment principles.
- Familiarity with Power BI or similar financial reporting and visualisation tools (learning willingness considered).
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About Southern Water
Southern Water is leading the transformation of Britain’s water industry through significant investments, enhancing resilience, sustainability, and service excellence.
With a £7.8bn planned investment for 2025–2030, this is an unparalleled opportunity to join a business driving a generational shift in water service delivery.
Our environment fosters growth and impact:
- Senior professionals can shape major strategic decisions and influence long-term outcomes.
- Innovation thrives in a diverse, inclusive culture where each voice matters.
- Meaningful careers with personal and professional development opportunities.
Our Commitment to Diversity & Flexibility
- All backgrounds and identities are welcome; we do not discriminate based on race, ethnicity, gender, age, religion, ability or other protected characteristics.
- Reasonable adjustments available during recruitment — please let us know your needs.
- Inclusive culture: No requirement to "tick all boxes"—passion and passion drive success.
Security & Pre-Employment Checks
Appointments are subject to:
- Identification verification.
- Work eligibility confirmation.
- DBS (Disclosure and Barring Service) criminal record check.
- Employment/education verification for the past three years.
Our Values: Water for Life
At Southern Water, customers are at the heart of everything we do. Our purpose? Delivering water for life.
To achieve this, we prioritise:
- 24/7 incident response to resolve issues efficiently.
- Teamwork during unexpected challenges, ensuring uninterrupted service.
If this opportunity excites you and you’re unsure about flexible working possibilities, we are here to listen. Let’s discuss how we can find practical solutions that align with your needs.
"Forever evolving. Forever focused on doing the right thing. Join us in shaping a fair and sustainable future." Dive Right In.
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