Energy Star Ratings Explained: How Many Stars Do You Really Need?

You've seen the colourful star rating labels on appliances in every Australian retail store — but do you actually understand what they mean? More importantly, do you know when it's worth paying extra for a higher star rating, and when those extra stars won't make a meaningful difference to your power bill? Here's a complete guide to the Australian energy rating system and how to use it to make smarter purchasing decisions.

How the Star Rating System Works

Australia's Energy Rating Label is a standardised system managed by the federal government through the GEMS (Greenhouse and Energy Minimum Standards) Act. The label appears on a wide range of appliances including refrigerators, washing machines, dryers, dishwashers, televisions, air conditioners, and computer monitors.

The key elements of the label are:

• Star rating (1–6 stars, or up to 10 on the new scale): More stars = more energy efficient compared to similar-sized appliances in the same category.
• Energy consumption figure (kWh/year): The estimated annual energy consumption based on standardised testing. This is the number to focus on for calculating your actual running costs.
• Appliance size/capacity: The rating accounts for the appliance's size, so you're comparing like with like — a large fridge with 4 stars is more efficient than a large fridge with 3 stars, but it will still use more energy than a small fridge with 3 stars.

What Each Extra Star Saves You

The value of each additional star varies by appliance type, but here's a general guide based on 2026 electricity rates (approximately 33c/kWh):

As you can see, the value of extra stars is most significant for appliances that run continuously (fridges) or consume large amounts of energy (air conditioners, dryers). For lower-consumption appliances like TVs, the difference per star is modest.

When to Pay More for More Stars

As a general rule, paying a premium for a higher star rating makes financial sense when:

• The appliance runs 24/7: Refrigerators and freezers benefit enormously from higher ratings because they never switch off. An extra star on a fridge saves $30–$50 per year, every year, for the life of the appliance.
• The appliance is heavily used: If you run your air conditioner daily for 6+ months of the year, the savings from a higher-rated unit compound significantly.
• The price premium is small: If the difference between a 3-star and 4-star model is only $100–$200, the extra star will typically pay for itself within 3–5 years.
• You plan to keep the appliance long-term: The longer you own the appliance, the more value you extract from each extra star. A fridge you'll keep for 15 years gets 15 years of savings from each star improvement.

When extra stars aren't worth it

• TVs and monitors: The savings per star are relatively small ($5–$15/year). Don't pay a big premium for energy efficiency on a TV — choose based on picture quality and features instead.
• Rarely used appliances: If you only use your dryer a few times a month, the difference between a 3-star and 5-star dryer is negligible.
• Large price gaps: If the higher-rated model costs $500+ more, the payback period may exceed the appliance's lifespan.

The New Expanded Rating Scale

As appliance technology has improved, many products have clustered at the top of the original 1–6 star scale, making it hard to distinguish between them. To address this, the Australian government has introduced an expanded scale with up to 10 stars for some appliance categories.

The expanded scale uses a "super-efficiency" zone above 6 stars. You'll recognise it by the different colour — the expanded zone is displayed in a different shade on the label. This is particularly common on:

• Refrigerators and freezers: The most efficient models now reach 7–9 stars on the expanded scale
• Washing machines: Front loaders regularly achieve 7+ stars
• Air conditioners: The best inverter models reach the expanded range

If you're comparing two appliances and both have 6 stars on the old scale, check whether either has an expanded rating — the difference in energy consumption could still be significant.

Zoned Energy Rating Labels for Air Conditioners

Air conditioners have a unique label variation called the Zoned Energy Rating Label (ZERL). Because air conditioner performance varies dramatically depending on climate, the ZERL shows efficiency ratings for three different climate zones:

When comparing air conditioners, look at the star rating for your climate zone, not just the overall rating. A unit that's highly rated for the hot zone might perform quite differently in a cold zone, and vice versa.

Tips for Using Star Ratings Effectively

• Compare the kWh figure first: Two appliances might have the same star rating but different kWh consumption due to size differences. Always compare the energy consumption number.
• Compare within the same size category: A 3-star 300L fridge uses less energy than a 5-star 600L fridge. Stars compare efficiency, not total consumption.
• Calculate the payback: Multiply the kWh difference between two models by your electricity rate (approximately $0.33/kWh) to find the annual savings, then divide the price difference by the annual savings to find the payback period.
• Check the registration database: The government's Energy Rating website (energyrating.gov.au) has a searchable database where you can compare the energy consumption of thousands of registered appliances.

The star rating system is a powerful tool for making smarter appliance purchases — but only if you use it correctly. Focus on the kWh consumption figure for the most accurate cost comparison, prioritise high ratings for always-on and heavily-used appliances, and don't overpay for extra stars on appliances you rarely use.