The Electricity Services Entry Mechanism (ESEM) is not just another scheme. It is the most significant structural reform to the National Electricity Market (NEM) in a generation: a permanent, legislated, centralised contracting framework intended to replace the Capacity Investment Scheme (CIS) from 2027 and unlock tens of billions of dollars in investment.
But ESEM contains a paradox. The features that make the proposed contracts attractive as market instruments (fungibility, standardisation and tradeability) may also make them harder to finance. That matters because Australia’s next wave of renewable projects will not be built on elegant market design alone. Someone still has to lend against the cashflows.
The policy ambition is clear. The harder question is whether that ambition can be translated into contracts that developers will bid, banks will debt-size and investors will back. If the mechanics do not work, the capital will not come.
What the pilot working group agreed and what it revealed
The pilot contract co-design working group has reached agreement on preferred instruments for each ESEM category: (a) an ex-post dispatch-weighted average swap (DWS) for bulk energy (settling against the average spot price received by a reference fleet, rather than the flat baseload swap or run-of-plant Power Purchase Agreement (PPA) familiar to existing participants); (b) heads and tails spreads for shaping; and (c) caps for firming. Capped and uncapped time-of-day block contracts remain the fallback if unresolved issues with the ex-post contracts prove intractable.
