A practical guide to understanding, evaluating, and negotiating PPAs in the Australian energy market — for commercial buyers, sustainability teams, and renewable developers.
A Power Purchase Agreement (PPA) is a long-term contract between an electricity generator and a buyer (the offtaker). The buyer agrees to purchase electricity at a pre-agreed price — typically for 5 to 15 years — providing revenue certainty for the generator and price stability for the buyer. PPAs are a cornerstone of renewable energy project finance in Australia, enabling new wind and solar projects to secure the bankable revenue needed for construction.
For corporate buyers, PPAs offer a way to lock in long-term electricity costs, meet renewable energy and emissions reduction targets, and demonstrate climate leadership. The Australian corporate PPA market has grown rapidly, with major offtakers including mining companies, data centre operators, manufacturers, and government agencies.
The simplest structure. Your electricity retailer sources power from a specific renewable project on your behalf. You receive a bundled retail bill that includes network charges, market fees, and the PPA price. The retailer manages market risk, settlement, and metering — making this the most accessible option for organisations new to PPAs.
A direct contract between your organisation and the generator, with a retailer acting as a "sleeve" to handle physical delivery, network access, and market settlement. You negotiate the PPA price directly with the generator and bear the settlement risk. This gives more control over pricing but requires deeper market understanding.
A purely financial contract — no physical electricity changes hands. The buyer and generator agree on a strike price. When the spot price exceeds the strike price, the generator pays the buyer the difference; when spot is below, the buyer pays. This structure works across NEM regions (the buyer and generator can be in different states) but introduces basis risk if the generator's regional reference price differs from the buyer's.
An emerging structure where a financial intermediary (typically a bank or energy trader) sits between the generator and buyer, absorbing volume and shape risk. The buyer receives a fixed price; the intermediary manages the mismatch between the generator's variable output and the buyer's flat demand profile.
Price risk: If wholesale prices fall significantly below your PPA strike price, you may be paying above market rates for the contract term. Conversely, if prices rise, the PPA protects you. Historical price analysis helps quantify this risk — check our live electricity prices and price forecasts for current trends.
Volume risk:"As-generated" PPAs expose buyers to weather variability — you may receive more or less than expected in any given period. Solar PPAs have predictable seasonal patterns but day-to-day variability. Wind PPAs can vary significantly month to month.
MLF risk:Marginal Loss Factors change annually and directly affect generator revenue. A declining MLF at your contracted generator's connection point may trigger price review clauses or affect settlement economics. See our MLF data for current factors by region.
Curtailment risk: Growing renewable curtailment in congested network zones can reduce the volume delivered under a PPA. Generators in constrained areas may produce less than weather conditions would otherwise allow.
Counterparty risk:The financial health and operational capability of the generator (or intermediary) matters over a 10+ year contract. Due diligence should cover the developer's track record, project finance structure, and O&M arrangements.
A robust PPA evaluation should compare the offered strike price against historical spot prices in the relevant region, accounting for the settlement profile and indexation terms. Key questions include: What would this PPA have cost versus buying on the spot market over the last 1–5 years? How does the seasonal pattern of the generator's output align with your consumption profile?
gridIQ's PPA evaluator backtests a proposed PPA against historical price data, breaking down performance by season, calculating risk metrics (value-at-risk, maximum drawdown), and providing a clear verdict on whether the terms are favourable, neutral, or unfavourable relative to recent market conditions.
Beyond price, evaluate the carbon intensityprofile of the generator's region, the project's generation mix context, and network congestion trends that may affect future delivery volumes.
Backtest any PPA proposal against real market data. Compare strike prices, settlement profiles, and indexation terms across NEM regions — with seasonal breakdown and risk metrics. Available on Professional and Enterprise plans.
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