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WattMateWattMate

Western Australia's solar and battery platform. Free and independent.

Fighting dodgy deals and bill shock, one rooftop at a time.

0459 742 134
admin@wattmate.com.au

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Supporting members of the Clean Energy Council
WattBot, WattMate's bill and tariff explainer — a WattForce brand character
Explained by WattBot, WattMate's bill and tariff explainer
About WattForce expertsAn illustrated WattMate expert persona — a brand character voicing our team's real WA solar experience, not a real person.
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Want more detailed analysis?

Home energy assessment

Scan appliances with your camera, upload your bills, and get personalised savings recommendations

Product index

Browse every CEC-approved home battery, inverter and solar panel available in WA

Quote checker

A second opinion on any quote you've been given — checked against CEC listings and what you've told us.

Warming up the energy hub...

Energy hub

What do you want to work out?

Pick what's on your mind — bills, solar sizing, an appliance, or going electric — and we'll point you at the right calculator. Every tool runs on real WA tariffs and current rebates.

Start here

Get your energy plan

Not sure which numbers matter for your home? Answer a few questions — or upload a bill — and get one ranked plan: solar, battery, electrification and tariff savings, biggest wins first.

Build my plan

Or browse by what you're weighing up

Every calculation, grouped by the decision it helps with.

Bills, tariffs & rebates

What you pay Synergy today, and what government rebates hand back.

Solar & battery sizing

What size system suits your home, and how it performs on your roof.

ROI & payback

Compare options over their full lifetime cost, not just day one.

Appliances & efficiency

What each appliance costs to run, and where the easy savings are.

EV & electrification

Switching gas appliances and driving costs over to electric.

My scenarios

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25-year solar ROI projection

A WA estimate that includes 0.5% annual panel degradation and 2% yearly electricity price rises.

$8,500
$2,200/yr
Payback

4 yrs

25-year savings

$66,053

Total ROI

677%

1
$2,200
2
$4,433
3
$6,699
4
$8,999
5
$11,333
6
$13,702
7
$16,106
8
$18,546
9
$21,022
10
$23,535
11
$26,086
12
$28,675
13
$31,302
14
$33,968
15
$36,674
16
$39,420
17
$42,207
18
$45,036
19
$47,907
20
$50,821
21
$53,778
22
$56,779
23
$59,825
24
$62,916
25
$66,053
Before payback After payback System cost
Net profit: $57,553
Energy calculators for WA homes | WattMate