Understanding Your Synergy Bill: A Complete Guide for WA Homeowners

Your Synergy electricity bill can feel like it's written in another language. Between supply charges, usage tiers, and solar credits, it's easy to miss where your money is actually going. Let's break it down section by section.

The Anatomy of a Synergy Bill

Every Synergy bill follows the same basic structure. Understanding each section helps you identify where savings are hiding.

Account Details

At the top of your bill, you'll find your account number, supply address, and billing period. The billing period is important — it determines how many days of usage you're being charged for. Most Synergy bills cover approximately 60 days (bi-monthly).

Your Tariff Plan

This is one of the most important sections. Synergy offers several residential tariff plans:

| Tariff | Best For | Off-Peak Rate | |--------|----------|---------------| | A1 (Home Plan) | Standard households | N/A (flat rate) | | Midday Saver (A3) | Solar households | 11am-3pm discount | | Smart Home Plan | EV/battery owners | Time-of-use rates | | EV Add-On | EV charger households | Super off-peak EV rate |

If you're not sure which tariff you're on, check the line item descriptions. They'll reference your plan code.

Supply Charge

The supply charge is a fixed daily fee you pay regardless of how much electricity you use. Think of it as a connection fee. As of 2026, this is approximately $1.10 per day for most residential customers.

Key insight: You can't avoid the supply charge, but understanding it helps you calculate the true cost of your electricity. Over a 60-day billing period, that's around $66 just for being connected.

Usage Charges

This is where the bulk of your bill comes from. Synergy charges for electricity usage in cents per kilowatt-hour (c/kWh).

For the standard A1 tariff, there's a flat rate applied to all usage. For time-of-use plans like the Smart Home Plan, rates vary by time of day:

• Peak hours (3pm–9pm weekdays): Highest rate
• Off-peak hours (9pm–7am): Lower rate
• Shoulder (7am–3pm weekdays, weekends): Mid-range rate

Solar Credits (REBS/DEBS)

If you have solar panels, you'll see credits on your bill for exported energy. Western Australia has two main buyback schemes:

• REBS (Renewable Energy Buyback Scheme): The standard buyback rate for systems under 5kW inverter capacity
• DEBS (Distributed Energy Buyback Scheme): For newer systems, with rates that vary by time of day

DEBS rates are particularly interesting because midday exports earn a lower rate while peak-time exports (3pm–9pm) earn more. This creates an incentive to shift your solar usage patterns or add battery storage.

GST and Total

GST (10%) is added to your total charges. Your solar credits are applied before GST is calculated on the net amount.

How to Read Your Usage Graph

Most Synergy bills include a usage graph comparing your current period to previous periods. Look for:

• Seasonal patterns — Summer bills are often higher due to air conditioning
• Year-on-year comparison — Is your usage trending up or down?
• Daily average — Divide total kWh by billing days for a meaningful comparison

Common Bill Surprises

Why is my bill so high?

The most common reasons for unexpectedly high bills in WA:

1. Seasonal changes — Air conditioning in Perth summers can double or triple your bill
2. Estimated reads — If Synergy couldn't access your meter, they may have estimated usage
3. Tariff changes — Government rate increases happen annually (usually July 1)
4. New appliances — Pool pumps, hot water systems, and electric heating are major consumers
5. Solar system issues — If your solar inverter has faulted, you lose free daytime generation

What's an "estimated read"?

If your meter shows "E" or "Estimated" next to the reading, Synergy has guessed your usage based on historical patterns. The next actual read will correct any over or under-estimation.

Spotting Savings Opportunities

Here's a checklist to find savings on your bill:

Check your tariff:

• If you have solar, are you on the Midday Saver plan? This gives you discounted rates during peak solar hours.
• If you have an EV, the EV Add-On tariff could save you hundreds per year on charging costs.

Check your export credits:

• Are you exporting a lot of solar energy at low DEBS rates? A battery could help you store and use that energy at peak times instead.

Check your peak usage:

• High peak-period usage? Simple timer switches on pool pumps, hot water, and dishwashers can shift load to off-peak hours.

Check for anomalies:

• Compare with previous bills. A sudden jump without explanation could indicate an appliance fault or meter issue.

Using BillWise to Analyse Your Bill

Upload your Synergy bill to BillWise for an instant analysis. We'll:

• Break down your costs by category
• Calculate your BillWise Score (how optimised your energy setup is)
• Identify specific savings opportunities
• Compare your usage against WA averages
• Recommend tariff switches, solar, battery, or electrification upgrades

Your bill has all the data -- BillWise just reads it for you.

Next Steps

1. Upload your bill to get your personalised BillWise Score
2. Compare tariff plans to see if switching could save you money
3. Explore solar + battery options if your export credits suggest an opportunity

Ready to act? Analyze your bill now → — upload your Synergy bill and get a personalised breakdown with savings recommendations in seconds.