Highlights:

  • Unit generation cost fell to $37.11/MWh in May 2026, down from $49.26/MWh in May 2025 — a 25% year-on-year improvement driven by near-zero thermal dispatch and higher hydro output.
  • Electricity generated reached 1,034 GWh in May 2026, up 23% on the prior comparable period, with hydro output of 464 GWh representing a 66% year-on-year increase.
  • Otahuhu Q3 2026 ASX futures prices dropped from $144/MWh at 30 April 2026 to $111.85/MWh by 11 June 2026, reflecting an oversupplied market driven by reservoir levels at 149% of mean in the North Island.

 

Contact Energy Limited (ASX:CEN) traded at AUD 7.83 on 16 June 2026, up 0.51% on the day, as the market absorbed the company's May 2026 Monthly Operating Report. The report captures a period in which elevated hydro inflows, near-dormant thermal generation and rising customer connections combined to paint a materially different operational picture compared with the same month a year ago. Investors tracking the New Zealand electricity sector will find the report a useful lens through which to examine both the near-term earnings trajectory and the medium-term implications of Contact's accelerating renewable development pipeline.

Generation: Hydro Dominates, Thermal Virtually Idle

The most striking development in Contact's May 2026 operating data is the transformation of its generation mix. Total electricity generated or acquired reached 1,034 GWh for the month, up from 842 GWh in May 2025. Hydro generation accounted for 464 GWh of that total — a 66% increase on the 279 GWh produced in the same month last year — as Contact's Clutha catchment benefited from inflows that, while slightly below mean at 89% for May, followed an exceptionally wet April at 123% of mean. South Island controlled storage stood at 120% of mean and North Island storage at 149% of mean as at 11 June 2026.

Thermal generation was effectively absent from the May 2026 mix, recording just 1 GWh compared with 105 GWh in May 2025. This represents a near-complete exit from carbon-intensive dispatch for the month and is the primary driver behind the unit generation cost improvement. Own generation cost fell to $24.31/MWh from $42.27/MWh in the prior comparable period, a reduction of more than 42%. Unit generation cost including acquired generation came in at $37.11/MWh, down from $49.26/MWh — a 25% improvement that flows directly to wholesale margin.

Geothermal generation of 450 GWh was also higher year-on-year from 432 GWh, reflecting the steady baseload contribution from Contact's Wairakei and Te Mihi assets. The company's battery asset contributed 4 GWh in May, a small but growing addition to its dispatchable portfolio. Acquired generation via power purchase agreements added 60 GWh, a new component absent from May 2025 comparatives and reflecting recent structural changes in Contact's procurement framework.

Wholesale Business: Revenue Per MWh Softens on Price Compression

Contracted wholesale electricity sales totalled 1,027 GWh in May 2026, up 34% on the 768 GWh reported in May 2025, driven by a near-doubling of commercial and industrial sales to 205 GWh and growth in electricity contract-for-difference sales to 481 GWh. Despite this volume expansion, total electricity and steam net revenue per MWh declined to $159.86 from $169.49 in the prior comparable period, a consequence of the broader decline in wholesale spot prices.

The forward market is repricing significantly. The Otahuhu Q3 2026 ASX futures settlement price has moved from $144/MWh at the end of April to $118.70/MWh at 29 May 2026 and further to $111.85/MWh by 11 June 2026. This trajectory reflects the very high hydro storage levels now held across New Zealand's controlled schemes, which reduce the market's reliance on thermal peaking generation and therefore compress the scarcity premium embedded in forward curves. For Contact, lower wholesale prices represent a headwind to revenue per MWh but are partially offset by lower thermal fuel costs and the company's LWAP/GWAP ratio, which remained at 105% in May — consistent with prior periods.

Customer Business: Volume Growth and Steady Netback

The retail division delivered mass market electricity and gas sales of 461 GWh in May 2026, up from 365 GWh a year earlier, with gas volumes more than doubling to 143 GWh from 55 GWh as the company continues to build share in the dual-fuel segment. Customer netback of $148.13/MWh was modestly higher than the $145.13/MWh achieved in May 2025 but below the $153.24/MWh recorded in April 2026, reflecting seasonal dynamics and energy cost movements.

Electricity ICPs grew to 462,000 from 443,500 a year ago, gas ICPs reached 78,500 from 73,000, and telco connections expanded to 146,000 from 122,000. Total customer connections stood at 695,000, up from 642,000 in May 2025. The sustained growth in connection counts suggests the company's bundled service strategy is gaining traction in a competitive market. Actual electricity line losses were 7% in May 2026, slightly above the 6% in May 2025, a minor variation that is not unusual across seasonal periods.

Development Pipeline and ESG Metrics

Contact's renewable development program remains a key structural feature for longer-term investors. Four projects are currently under construction with a combined approved capital cost of approximately $1.54 billion. Kowhai Park Solar and Glorit Solar (both via a 50/50 joint venture with Lightsource bp) are expected online in Q3 2026 and Q4 2028 respectively, while Te Mihi Stage 2 geothermal targets Q3 2027 and the Glenbrook-Ohurua Battery is scheduled for Q1 2028. This pipeline underpins a growing proportion of zero-fuel-cost, non-weather-dependent baseload in the company's generation portfolio.

The company's quarterly ESG disclosures show greenhouse gas emissions from generation assets fell to 67 kt CO2-e in Q3 FY26 from 271 kt CO2-e in Q3 FY25, with GHG intensity of generation dropping to 0.032 kt CO2-e per GWh from 0.136 — a consequence of the thermal displacement visible in the monthly generation data. Board gender composition stands at 29% women and 71% men, while the workforce gender balance is approximately 42% female and 57% male.

Contracted Gas Position and Operational Context

Contact's contracted gas volume for the next 12 months is 8.2 PJ, compared with 8.2 PJ in gas used in internal generation across the eleven months to May 2025, highlighting the significant reduction in thermal reliance. Gas storage showed a net extraction of 0.3 PJ in May 2026, reflecting some draw-down of stored reserves even as thermal dispatch approached zero — a sign of normal seasonal gas management rather than any supply constraint. The company's overall gas book appears conservatively positioned given the hydro-dominant generation environment.

Conclusion

Contact Energy's May 2026 operating report captures a company operating at a fundamentally lower cost point than it was twelve months ago, with the combination of abundant hydro resources, a near-idle thermal fleet and growing customer connections creating a materially improved unit economics profile. The forward pricing environment has softened considerably, which will bear watching as a potential revenue headwind into Q3 FY27, but the simultaneous reduction in generation cost provides a natural offset. The ongoing capital deployment across four renewable construction projects signals that management is positioning the company to sustain these structural advantages beyond the current hydro cycle.