What changed
Revenue rose NZ$150m (+9.3%) to NZ$1,755m in HY25, driven by higher sales yields across both the Generation/Wholesale and Customer segments, but this top-line strength did not flow through to operating earnings. EBITDAF fell NZ$16m (-3.7%) to NZ$418m, as increased operating costs and lower hydro generation more than offset the yield improvement. The Generation/Wholesale segment remained the dominant earnings engine but saw its inferred EBITDAF margin compress to approximately 35.6% from 40.5%, while the Customer segment deepened its EBITDAF loss to NZ$26m from NZ$20m on modestly higher revenue of NZ$850m.
The most visible number — a NPAT loss of NZ$67m against a NZ$174m profit in HY24 — is almost entirely explained by movements in fair value through the income statement rather than by cash trading. PBT swung from +NZ$245m to -NZ$96m, a NZ$341m deterioration. The effective tax rate becomes non-comparable across periods (a tax benefit applied to a pre-tax loss in HY25 against a normal expense in HY24), so PBT is the cleaner operating read, and even that is heavily distorted by fair-value movements on financial instruments rather than underlying trading.
Operating cash flow fell NZ$56m to NZ$227m. Capex accelerated to NZ$202m from NZ$132m, leaving estimated pre-lease free cash flow of approximately NZ$25m versus NZ$151m in HY24. Gross borrowings rose NZ$180m to NZ$2.2bn, lifting estimated net debt to approximately NZ$2.1bn.
The interim dividend was lifted to 9.6 cents per share from 9.3 cents. This is the current-period announced component; the full-year total will depend on the final dividend to be declared at year-end (the FY24 total was 23.3 cents per share, comprising a 14.0-cent final).
What matters
Fair-value volatility is dominating statutory earnings, obscuring underlying performance. The NZ$341m PBT swing is disproportionate to the NZ$16m EBITDAF decline, which means a substantial portion relates to mark-to-market movements on energy hedges and financial derivatives — instruments that will unwind over future periods. Until Mercury discloses the quantum of these fair-value movements separately, the statutory loss tells investors very little about cash-generating capacity.
Cash conversion has deteriorated materially and free cash flow has almost disappeared. OCF/EBITDAF fell to 54.3% from 65.2%, and pre-lease free cash flow collapsed from NZ$151m to approximately NZ$25m as capex surged. The company attributed roughly half of first-half EBITDAF to reinvestment in renewable assets, which contextualises the capex step-up, but the dividend is now being funded from borrowings rather than free cash flow. Gross debt at NZ$2.2bn and estimated net debt/EBITDAF of approximately 5.0x (annualised first-half EBITDAF basis) marks a clear leveraging trajectory.
EBITDAF quality itself is under pressure from the operational side. Lower generation volume and higher operating costs compressed the core Generation/Wholesale segment margin even before fair-value and financing effects. If generation volumes remain subdued in HY25 (reflecting hydrology risk), the underlying earnings capacity is weaker than the headline EBITDAF trend suggests.
Expectations
No formal FY25 guidance was disclosed in the filing excerpts provided. There are no stated targets against which to benchmark this result.
Using FY24 as a seasonality reference, HY24 contributed 49.5% of full-year EBITDAF and 46.9% of full-year revenue, indicating the business is broadly balanced across halves. On that shape, the NZ$418m HY25 EBITDAF implies a full-year EBITDAF run-rate of approximately NZ$845m — modestly below FY24's NZ$877m — assuming no recovery in generation volume or operating cost normalisation in the second half.
HY25 revenue annualises to approximately NZ$3.51bn, about 2.5% above FY24's NZ$3.42bn, which is consistent with yield improvement continuing to support the top line even under volume pressure.
The second half of FY24 delivered NZ$443m of implied EBITDAF and NZ$329m of operating cash flow. Replicating that in HY25(2H) would require generation volumes and cost profiles to improve from first-half levels. Given that HY25 explicitly called out lower generation as a key EBITDAF drag, the H2 recovery assumption carries meaningful hydrology uncertainty.
Quality of result
The underlying cash-earnings quality is moderate and declining relative to HY24. EBITDAF of NZ$418m represents genuine operating cash contribution before financing and tax, but several factors reduce confidence in its durability:
- The margin compression in Generation/Wholesale reflects lower output, not a structural cost reduction. If hydrology normalises, some recovery is plausible, but it is weather-dependent rather than structural.
- Operating cost growth outpaced revenue growth, suggesting cost inflation or growth-investment costs are embedding into the run rate.
- The statutory NPAT loss is driven by fair-value movements — timing-driven and balance-sheet-assisted rather than permanent — but these positions will continue to create volatility until settlements occur.
- Cash conversion at 54.3% of EBITDAF is below the prior period's 65.2%, and the NZ$25m of estimated pre-lease free cash flow is too thin to cover the dividend, which at 9.6 cents per share requires meaningful cash outflow. The dividend increase is therefore being funded through incremental borrowings at a point when leverage is already elevated.
- The NZ$11m inventory reduction is minor and does not materially distort operating cash flow.
The result as presented does not raise concerns about manipulation, but a substantial portion of the headline earnings movement is timing-driven (fair values) and the durable operating component — EBITDAF less normalised capex — has weakened noticeably.
Unresolved
- The magnitude and composition of fair-value movements embedded in the PBT swing are not separately quantified in the supplied data, making it impossible to cleanly strip out mark-to-market noise from the underlying trading result.
- The generation volume shortfall is described but not quantified by asset type or hydrology index; it is unclear whether the shortfall was concentrated in thermal substitution costs or in lost hydro output, which matters for the H2 recovery thesis.
- With estimated net debt/EBITDAF at approximately 5.0x on an annualised first-half basis, the headroom against any banking covenants and the refinancing schedule for the NZ$2.2bn debt book is not disclosed.
- The Customer segment has been loss-making at EBITDAF level for at least two comparable periods; no disclosure addresses the path to segment profitability or whether losses are considered an acceptable cost of market share.
- The dividend increase to 9.6 cents, with free cash flow near zero, raises a question about the capital allocation framework — specifically, whether the board has communicated a payout policy based on EBITDAF or some other metric rather than free cash flow coverage.
This briefing cannot assess the mark-to-market exposure profile, its maturity or settlement schedule, or the sensitivity of future reported earnings to movements in forward electricity prices and interest rates.
Key metrics
| Metric | HY25 | HY24 | Change |
|---|---|---|---|
| Revenue | $1755m | $1605m | +9.3% ↑ |
| Net profit after tax | −$67m | $174m | -138.5% ↓ |
| Net cash inflow from operating activities | $227m | $283m | -19.8% ↓ |
| Interim dividend per share | 9.6c | 9.3c | +3.2% ↑ |
| Profit before tax | −$96m | $245m | -139.2% ↓ |
| Cash and cash equivalents | $99m | $82m | +20.7% ↑ |
| Total assets | $9522m | $9518m | flat |
Segment breakdown
| Segment | Current revenue | Prior revenue | Current result | Mix shift |
|---|---|---|---|---|
| Generation/Wholesale | $1247m | $1120m | $444m | +1.3pp |
| Customer | $850m | $810m | −$26m | -2.1pp |
Analytical metrics
| Metric | HY25 | HY24 | Context |
|---|---|---|---|
| Effective tax rate | n/m (loss period) | -29.0% | current loss period |
| OCF / EBITDAF (cash conversion) | 54.3% | 65.2% | deteriorated |
| FCF pre-lease | $25.0m | $151.0m | −$126.0m |
| FCF / NPAT | -37.3% | 86.8% | complementary conversion metric |
| Capex % revenue | 11.5% | 8.2% | — |
| Capex | −$202.0m | −$132.0m | −$70.0m |
| Inventory days | 13.9 | 16.5 | -2.6 days |
| Net debt | $2101.0m | $1938.0m | +$163.0m |
| Net debt / EBITDAF | 5.00x | 4.50x | Weakening |
| Gross borrowings | $2200.0m | $2020.0m | +$180.0m |
| Payout ratio vs NPAT | -200.0% | — | — |
| ROE (annualised) | -1.4% | 3.6% | Weakening |
| HY24 share of FY24 revenue | 46.9% | — | Other half was 53.1% |
| HY24 share of FY24 EBITDAF | 49.5% | — | Other half was 50.5% |
| HY24 share of FY24 NPAT | 60.0% | — | Other half was 40.0% |
| Profit from continuing operations | −$67.0m | $174.0m | −$241.0m |
This analysis was generated using Annolyse, an AI-powered tool that extracts and analyses NZX/ASX company announcements. The underlying data is extracted from official company filings and verified against source documents. This is general information only and does not constitute financial advice. The analysis may contain errors. Always read the original company filings and consult a licensed financial adviser before making investment decisions.