Your first electricity bill after solar in Perth: what to expect

Most Perth households get solar installed, start generating power the same week, and then wait nervously for their first electricity bill — expecting to see their savings. Often the first bill is confusing or disappointing: partial credits, missing DEBS payments, or little visible change.

This is almost always normal. Here's what to expect and what to check.

The timeline after solar installation

Day 0: System commissioned
Your installer energises the system and it starts generating. Your inverter app shows generation immediately. But you're not receiving DEBS credits yet — the billing system hasn't caught up.

Day 1–7: Certificate of Electrical Compliance (CEC) paperwork
Your installer lodges the electrical work paperwork with EnergySafety WA and submits the Western Power connection notification (for systems within the pre-approved capacity). This is a regulatory step, not a delay on their part.

Week 2–12: Smart meter upgrade (if needed)
If your home doesn't already have a smart meter, Western Power schedules a meter exchange. This is where most of the waiting happens. Smart meter installations are typically scheduled 4–12 weeks after the connection notification is received — exact timing depends on the queue in your area.

DEBS activation:
Synergy activates DEBS (Distributed Energy Buyback Scheme) once they receive confirmation that your smart meter is installed and correctly recording export data. This typically happens within 1–4 weeks of the meter upgrade.

What your first bill typically shows

If your billing period straddles the installation date:
The bill covers days before and after solar. The first portion of the bill shows normal grid import (no solar). The second portion shows reduced import — but DEBS credits may only appear for the days after the DEBS activation date (which may be later than the install date).

This is why your first bill often shows modest savings even if the system has been running for weeks — you're only seeing partial-period credits.

If DEBS hasn't been activated yet:
Export during this period is not credited. Western Power and Synergy cannot backdate DEBS credits for export that occurred before the smart meter was installed and billing was configured. Export during the "smart meter waiting" period is effectively donated to the grid.

Important: check your Synergy bill for a "DEBS" or "solar credits" line item. If it's missing and your smart meter has been installed, contact Synergy directly to investigate.

Reading the solar credits on your Synergy bill

Under Midday Saver:

• A DEBS peak credit line: kWh exported 3pm–9pm × 10c
• A DEBS off-peak credit line: kWh exported other times × 2c

Under A1:

• A single DEBS credit line: total exported kWh × 2c

You'll also see your grid import reduced. The saving comes from both components: less import purchased AND export credits earned.

Common first-bill problems and what they mean

No DEBS credits at all:
Smart meter not yet installed, or Synergy hasn't received the DEBS activation notification. Contact Synergy to check status. Ask for a case number so you can follow up.

DEBS credits are there but very small:
DEBS rate on A1 is 2c/kWh — low. Even a 6.6kW system exporting 3,000 kWh/year only earns $60/year from DEBS. The main saving is from avoided grid import, not export credits.

Grid import is barely reduced despite solar:
If the billing period includes many days before DEBS activation, or if the system was installed in winter when generation is lower, this can happen. Check your inverter app's generation total for the period — if the inverter shows good generation but your bill doesn't reflect it, there may be a metering issue worth investigating.

Bill is higher than before solar:
Rare but possible if: (a) consumption increased for other reasons around the same time, (b) you switched tariffs and the new tariff has higher peak rates that aren't fully offset by solar, or (c) an appliance was added. Compare against the same period the previous year if possible.

What to do if something looks wrong

1. Check your inverter app — what is the total generation figure for the billing period?
2. Cross-reference with Synergy's smart meter data — log in to MyAccount and check the export data for the same period. Does it match your inverter's generation minus self-consumption?
3. Check DEBS activation date — call Synergy and ask for the exact date DEBS was activated on your account. Any export before this date is not credited.
4. If metering looks wrong — Synergy can request a meter accuracy test from Western Power. There is typically no cost if the meter is found to be faulty.

When to expect the system to reach its modelled performance

Your installer's generation estimate is typically an annual average figure. It assumes:

• A full 12 months of operation (not a partial first year)
• Average Perth weather (some years are sunnier or cloudier than average)
• Clean panels
• No shading that wasn't modelled

Give the system a full 12 months before comparing against the projected annual figure. In the first partial year, prorate the estimate for the months you've had solar.

Smart meter installation timelines are managed by Western Power and can vary significantly by area and demand. Contact Western Power for status on meter upgrades.