How to read your smart meter data in Perth (and what to do with it)

Western Power has been rolling out smart meters across Perth since 2012. If your home has a smart meter, it records your electricity consumption every 30 minutes — and exports the same granular data for any solar you send to the grid.

This half-hourly interval data is available to you for free through Synergy's MyAccount portal. Most Perth households never access it. But it's the single most useful dataset for understanding your energy use and making better decisions about tariffs, solar, and batteries.

What a smart meter records

A standard smart meter records two values for each 30-minute interval:

• Import (consumption): electricity drawn from the grid (in kWh)
• Export (generation): electricity sent to the grid from your solar system (in kWh)

At 48 intervals per day, your smart meter generates approximately 17,520 data points per year for import alone — and the same again if you have solar export. This is the raw material for meaningful energy analysis.

How to access your interval data in MyAccount

1. Log in at Synergy's MyAccount portal
2. Navigate to "Your electricity usage" or "Usage history"
3. Select "Detailed usage" or look for a download/export option
4. Choose a date range (up to 12 months in a single request)
5. Download as CSV

What the CSV contains:

• Date and time period start (30-minute intervals)
• Consumption (kWh) for that interval
• Export (kWh) for that interval (if solar is connected)

You'll also see this data visualised as a bar chart in MyAccount, showing daily, weekly, or monthly consumption with time-of-day breakdown.

What to look for in your data

Your consumption time-of-day profile

Looking at a typical weekday vs weekend breakdown reveals:

• When your peak consumption occurs (often early morning and evening for commuting households)
• Whether your baseload is high (always-on appliances: pool pump, hot water, standby devices)
• When solar self-consumption occurs naturally vs what gets exported

Why this matters for tariff choice: a household with high 9am–3pm consumption benefits from Midday Saver's 8.85c super off-peak rate. A household with heavy 6pm–9pm consumption (without a battery) is penalised by Midday Saver's 55.33c peak rate. The interval data proves which scenario applies to your home.

Baseline load at night

The minimum 30-minute consumption figure between midnight and 5am tells you your household's approximate baseload — the always-on load that runs 24 hours a day. Common sources: pool pump (if not on a timer), hot water system heating, fridge/freezer, modem/router, network-attached storage, and smart home devices.

A baseload of 0.3 kWh/hour (720W) is common in Perth homes. At 33.26c/kWh over a year, that's 0.3 × 24 × 365 × $0.3326 = approximately $876/year in baseload electricity alone. Identifying and reducing baseload is often the most impactful efficiency intervention.

Export profile

For solar households, the export data shows:

• What time generation peaks on your roof (north-facing peaks earlier; west-facing peaks later)
• Whether you're consistently hitting the export limit (if so, you may benefit from battery storage to use more of your own generation)
• How winter generation compares to summer (used to validate installer projections)

Applying your data to tariff decisions

Should you switch to Midday Saver?

The interval data calculation:

Step 1: Total up all consumption in each Midday Saver time band across 12 months:

• 9am–3pm (super off-peak): multiply by 8.85c/kWh
• 3pm–9pm (peak): multiply by 55.33c/kWh
• All other hours: multiply by 24.34c/kWh

Step 2: Total up all consumption under A1 for the same period:

• All hours: multiply by 33.26c/kWh

Step 3: Apply DEBS rates to export:

• Under Midday Saver: 3pm–9pm exports × 10c, other exports × 2c
• Under A1: all exports × 2c

If Midday Saver total < A1 total, switch. Your interval data gives you the exact saving figure, not an estimate.

What BillWise can do with your data

BillWise's bill analysis uses your uploaded energy bill to reconstruct usage patterns. But if you can supply your interval data CSV from MyAccount, the analysis becomes significantly more precise:

• Exact tariff comparison (A1 vs Midday Saver vs HomeStart) with your actual consumption shape
• Solar self-consumption modelling (if you're considering solar, uses your real consumption times to size system appropriately)
• Battery sizing (how much evening consumption could be covered by stored solar)
• Appliance shifting recommendations (identifies which time periods have the most to gain from load shifting)

The interval data turns "you might save around $X" into "based on your specific half-hourly usage, you would save exactly $X by switching to Midday Saver."

Common questions about smart meter data

My home doesn't have a smart meter — can I still get this data?
No. Older accumulation meters only record total consumption since the last reading, with no time-of-use detail. Western Power is still rolling out smart meters — contact them to check if your area is scheduled.

Can I download more than 12 months at once?
Synergy's MyAccount typically limits exports to 12 months per request. Download the last 12 months, then request the prior 12 months separately if you want a full 24-month history.

My solar monitoring app shows different numbers to Synergy — which is right?
The Western Power smart meter is the billing standard. Your inverter's generation reading and your smart meter's import/export reading may differ by 1–3% due to measurement timing and system losses. The smart meter is authoritative for billing purposes.

Synergy MyAccount data access current as of June 2026. Interface may change with portal updates.