NZ$539m working-capital build dwarfed NZ$17m EBITDAF decline

That absorption coincided with operating cash flow falling 18.0% to NZ$283.0m, even though reported revenue rose to NZ$1.6b from NZ$1.3b on a comparable that carries a basis-change caveat.

PBT fell NZ$61.0m to NZ$245.0m and NPAT fell NZ$56.0m to NZ$174.0m, both on a comparable that is not analytically clean. The effective tax rate rose from 24.8% to 29.0%, widening the PBT-to-NPAT growth gap by 4.4pp. Net debt/EBITDAF moved to 4.5x from 3.9x, and the declared interim dividend component was 9.3 cents per share versus 8.7 cents in HY23.

OCF/EBITDAF cash conversion at 65.2% remains inside the company's historical range (mean 62.7%, range 54.3-76.5%), so on a ratio basis the print is unremarkable. What is remarkable is the NZ$539.0m working-capital expansion behind it, with trade debtors at NZ$505.0m and receivable days drifting to 57.3 from 55.2. This matters because dividend cover and leverage headroom now depend on receivables converting in H2, not on operating earnings doing more work.

Retail turned negative and generation margin compressed. Retail revenue rose to NZ$810.0m but the segment result swung from +NZ$11.0m to -NZ$20.0m (segment margin -2.5% versus 1.5%). Generation/wholesale gross margin fell to 40.5% from 52.7% even as revenue grew to NZ$1.1b. Compression at both ends of the integrated value chain says the wholesale price environment is squeezing the chain, which limits the EBITDAF lift from new generation volume.

Capex stepped up sharply while leverage drifted. Capex of NZ$132.0m was 76% above HY23, lifting capex intensity to 8.2% of revenue from 5.8%. Pre-lease FCF of NZ$151.0m is meaningful, but net debt/EBITDAF at 4.5x is moving against the company even while staying inside the historical range (mean 4.96x).

With HY24 EBITDAF at NZ$434.0m, that implies a NZ$446m second half, broadly consistent with HY23's 53.6% first-half share of FY23 EBITDAF. The guidance lift signals confidence that hydrology, the newly commissioned Kaiwera Downs stage 1, and a full Turitea contribution are running ahead of the original FY24 plan.

What the release does not provide is forward customer hedge-book disclosure or a working-capital trajectory. This matters because investors cannot test whether the H1 receivables build reverses in H2, which is the key input to whether FY24 operating cash flow comfortably supports both the dividend and the higher capex run-rate.

PBT, NPAT, and revenue growth all carry basis-discontinuity caveats because of structural changes in the comparable, so the percentage moves are not directly comparable. Within that limit, around a third of the NPAT shortfall is explained by the higher effective tax rate (29.0% versus 24.8%) rather than by operating earnings.

The cash result is lower quality than the EBITDAF print suggests. Pre-lease FCF of NZ$151.0m looks strong against the historical baseline, but it is supported by a NZ$539.0m working-capital expansion that has to unwind in trade debtors to validate the headline. With capex up 76% to NZ$132.0m, the bridge from EBITDAF to dividend cover is materially tighter than in prior halves. The interim dividend uplift to 9.3 cents per share is a current-period component decision and does not, on the data supplied, define the full-year dividend policy.

This briefing cannot assess Mercury's hedge-book economics, wholesale price exposure, or the customer-level composition of the receivables expansion.