The price of an NSW Energy Savings Certificate (ESC) is harder to read than an STC price, because there is no clearing house ceiling holding it near a fixed number. It moves with the scheme’s targets, the stream of eligible activities and the rules governing what earns certificates. That makes history more informative, and more easily misread. This article explains what a price history for ESCs actually shows, and what to check before you rely on one.
We have kept to what is public and flagged what is reported. We do not give a tick-by-tick chart because we cannot verify one in this article, and the Energy Sustainability Schemes site and broker updates are the places to look for dated data.
What an ESC is
An ESC represents one tonne of CO2-equivalent saved by an eligible activity under the Energy Savings Scheme (ESS), which began in 2009. Electricity retailers and certain other liable entities have a target, expressed as a share of their electricity sales, and meet it by surrendering ESCs. Installers and Accredited Certificate Providers create the certificates by delivering upgrades such as efficient lighting, heat pump hot water, commercial refrigeration, air conditioning and industrial projects, then sell them. Our explainer on the ESS and our page on ESC prices in NSW give the basics.
Why ESC prices move
Four forces matter:
- The target. A higher share means more certificates demanded. A target that is set below what the market can supply pushes the price down.
- The supply of activities. When a popular method closes or opens, supply changes quickly. A method with a hard end date tends to produce a rush of creation before it closes.
- Method rules. Changes to the lifetime or baseline in a method change how many ESCs each job earns. A longer assumed lifetime lifts the count.
- Penalty rate. A shortfall penalty puts a practical ceiling on what a liable entity should pay.
Notice what is missing: the weather, the retail electricity price and anything about solar. ESC prices are a policy market first.
The shape of the history
Over the scheme’s life prices have swung through long cycles. Early years were driven by lighting, which created large volumes cheaply. As the easy savings were captured, methods were added and rules tightened. Periods of ample supply have been followed by periods where the market was short and prices rose. In 2025 and 2026 market reports put the price in the low to mid $20s (reported), with moves tied to scheme announcements rather than to any gradual drift.
Three dated events reported in market commentary matter for the current picture:
| Event | Reported date | Effect on the market |
|---|---|---|
| Commercial lighting method ends | 31 March 2026 | Supported prices on the announcement, reported rising from about $22.90 to about $23.75 on the day |
| Gas-fired boilers, gas-boosted water heaters and gas space heaters excluded | 1 July 2026 | Removes an activity group from creation |
| Air conditioning lifetime assumption lifted from 10 to 12 years | 2026 rule update | About a 20% uplift to certificates per eligible air conditioning job |
Treat these as reported and check the rule text on the NSW Energy Sustainability Schemes site before relying on any of them. The point is the direction: closing methods supports prices, and an added uplift on a high-volume activity adds supply.
How to read a price chart
A single line on a chart hides the events that moved it. When you look at any ESC price history, ask:
- Is this spot, forward or a broker’s indicative quote?
- Is it ex GST?
- Was there a method change or announcement near each kink?
- Is it a rate paid to an installer, or the market price before the trader’s margin?
A $27.50 versus $26.80 quote on a job of 400 ESCs is $280, about what a bad invoice term costs. The comparison that matters is net dollars and the date they arrive, a point we make in ESC trading.
What a price move means on a job
Take a commercial heat pump job creating 300 ESCs. At $23 that is $6,900, and at $26 it is $7,800. The $900 difference is the same as the entire certificate value of a small residential solar system, so ESC price moves matter to the businesses that work in them. For comparison, STCs hold in a band near $38 to $40 because of the clearing house, which is why STC income is more predictable.
From the desk: Do not hold ESCs hoping for a better price while you carry the cost of the job. If a method is about to close or change, the supply rush can push the price the other way. Know the method’s end date, sell on a rate you accept, and use the cash for the next job.
What the history cannot tell you
It cannot tell you the next target. NSW sets the ESS target in regulation, and it can change by consultation and decision, not by market signals. It also cannot tell you whether a method will survive. The NSW Government’s rule and regulation reviews are the best early signal, and the notice periods have usually been long enough to act on.
ESCs and the wider NSW picture
The ESS sits beside the Peak Demand Reduction Scheme, which creates Peak Reduction Certificates (PRCs). PRC prices have been far lower, about $3 (reported), and the reasons are covered in why PRC prices dropped. The ESS has its own updates in NSW ESS 2026 changes. The pillar for the whole family is ESCs and PRCs.
A short worked example
Suppose you deliver a commercial heat pump water heater upgrade that creates 120 ESCs under the current method. At $23 that is $2,760. If an air conditioning job with a 20% lifetime uplift creates 36 ESCs instead of 30 at the same price, the extra six are worth $138 on that job. Across 200 jobs a year it is $27,600, which is the sort of number a rule change can quietly add or remove. It is also why we suggest keeping a note of which method version applied to each job. The price chart shows the market, and the method guide shows your count.
Questions to put to a broker about ESC quotes
Ask whether the rate is ex GST, whether it is firm until you lodge or until settlement, how long registry transfer takes, and what happens to your rate if the market moves while the transfer is pending. A quote that cannot answer those four questions is an indication, not an offer.
What to do next
- If you create ESCs, check the method end dates for your activities before you quote
- Compare traders on net dollars and settlement date, using the certificate trader checklist
- Read how ESC trading works and see the Partner Program
- For solar and battery jobs in NSW, see STC trading and today’s rate on pricing