Fitch Ratings has affirmed Dwr Cymru (Financing) UK Plc's senior secured class A and B debt at 'A-‌', and Dwr's subordinated class C debt at 'BBB' - the Outlooks are Stable – but is cautioning over delivery risks.

Fitch said the affirmation and Stable Outlooks are supported by Dwr's comfortable net debt-to-regulatory capital value (RCV) headroom.

The Stable Outlook reflects the ratings agency’s assumption that total expenditure (totex) underspend will be offset during the second part of AMP8.

However, if the underspend persists, Fitch says it could further weaken post-maintenance interest coverage ratios (PMICRs )and increase exposure to price control deliverables mechanism clawbacks and execution risk from a material late-stage capex ramp-up.

“Lower investment could slow network improvements, weaken asset health and operational performance, and increase the risk of outcome delivery incentive (ODI) penalties and fines over the remainder of AMP8, ultimately pressuring PMICRs,” Fitch said.

The rating includes a number of key rating drivers as follows:

Sector risk remains high

Business risk in AMP8 remains moderately higher than in previous price controls, reflecting heightened environmental risk, greater public scrutiny and increased clawback exposure through the price control deliverables mechanism. Regulatory uncertainty also remains significant, including from the Cunliffe Review, Water White Paper and Water Reform Bill.

Fitch expects the transition plan and Strategic Policy Statement only after publication of the 10-Year Infrastructure Strategy, likely in 4Q26 or 1Q27. The regulatory framework remains the most important factor in its assessment of sector debt capacity at a given rating.

Fitch says it expects several iterations during the transition from Ofwat to a new regulator towards end-AMP8. Key uncertainties include execution risks, the influence of local leaders on investment and strategy, and whether functions can be transferred smoothly to a single regulator while maintaining investment momentum into AMP9. This is particularly relevant for Dwr, with the Welsh Government's Green Paper proposing a dedicated economic water regulator for Wales.

Backloaded capex raises delivery risk

Dwr has reprofiled its forecast capex, with a significant back-loading towards end-AMP8. Fitch forecasts around GBP4.2 billion of capex (net of grants and contributions) over AMP8, with around GBP512 million delivered as reported in the FY26 regulatory reporting. Back-loaded delivery may improve efficiency through greater design maturity or better-targeted expenditure, but it increases execution risk.

Failure to deliver the capex programme in full may result in funding clawbacks through the price control deliverables mechanism, where unspent allowances are returned to customers. In addition, lower investment in the network may worsen asset health and operational performance, resulting in higher ODI penalties and/or fines over the remainder of AMP8. However, our current rating case foresees that the company will accelerate investments in the second half of the regulatory period, ultimately delivering the capex plan.

Comfortable gearing headroom

We forecast comfortable headroom in Dwr's net debt/RCV against our negative sensitivity of 70%, with net debt/RCV increasing to about 63% by end-AMP8. The headroom is supported by the parent company, Glas Cymru Holdings Cyfyngedig, maintaining a non-dividend policy.

PMICR headroom remains limited

We expect limited headroom in PMICRs, with average cash and nominal PMICRs of 1.6x and 1.8x over AMP8, against negative sensitivities of 1.5x and 1.8x respectively. We forecast cash PMICRs to weaken to about 1.4x by end-AMP8, partly reflecting the decreasing share of inflation-linked debt in the capital structure. We forecast inflation-linked debt to represent 40%-45% of total debt by FY30, compared with about 56% in FY26.

Increased ODI Penalties assumed

We forecast nominal in-period ODI penalties of about £265 million for AMP8, including FY26 ODI penalties of £69 million in real 2022-2023 prices (including customer experience ODIs). Since the cash impact of these penalties arises with a two-year lag, we expect nominal cash ODI penalties of about £ 238 million over AMP8, including amounts for AMP7's final two years, which is higher than last year's assumption of £156 million. Water supply interruptions, serious pollutions and bathing water quality were key drivers of Dwr's FY26 ODI penalties. Fitch's rating case deducts ODI penalties from cash flow, affecting PMICR ratios.

Totex underspend

Before adjusting for timing, totex in FY26 was materially below the final determination cost allowances, with an overall totex underspend of about 12% (before cost sharing). This was driven mostly by timing differences, and we expect Dwr to perform in line with the final determination allowances over the length of the regulatory period, although we may adjust this assumption if totex underspend persists.

Fines treated as unfunded capex

Ofwat's conclusion that Dwr's had, among other violations, failed to operate, maintain and upgrade its wastewater assets adequately, resulted in a £ 44.7 million enforcement redress package. Fitch includes £ 59 million of potential fines in the rating case, including redress packages, as a conservative assumption for the risk of future investigations. We treat these amounts as unfunded capex, reducing post-maintenance cash flow and, consequently, PMICRs.

As at end-March 2026, Dwr had comfortable liquidity, comprising cash and cash equivalents of about £574 million and access to undrawn revolving credit facilities of £400 million maturing in February 2029. These sources provide ample coverage of upcoming debt maturities of £233 million and expected negative free cash flow of about £ 201 million in FY27.