Installing solar is one of the best ways to reduce electricity costs, but before choosing a system, it’s important to understand your electricity bill. Your bill contains valuable information that helps determine the right solar system size, potential savings, and whether adding a battery is worthwhile.
This guide explains how Australian homeowners can read their electricity bill and use it to make smarter solar decisions.
Why Your Electricity Bill Matters
Your electricity bill isn’t just a payment notice—it’s a snapshot of how your household uses energy. By understanding your usage patterns, a solar installer can recommend a system that maximises your return on investment instead of oversizing or undersizing your installation.
Check Your Total Electricity Usage (kWh)
The most important number on your bill is your electricity consumption, measured in kilowatt-hours (kWh).
Look for:
- Total kWh used
- Daily average usage
- Billing period
Example
| Household Size | Average Daily Usage |
|---|---|
| 2 People | 10–15 kWh/day |
| 3–4 People | 15–25 kWh/day |
| Large Family | 25–40+ kWh/day |
Knowing your daily usage helps determine the ideal solar system size.
Understand Peak and Off-Peak Charges
Many Australian homes are on Time of Use (TOU) tariffs.
Your bill may show:
- Peak Usage
- Shoulder Usage
- Off-Peak Usage
Peak Hours
Usually afternoons and evenings when electricity costs the most.
Off-Peak
Typically overnight when electricity is cheaper.
If most of your electricity is used during the day, solar panels can significantly reduce your bills.
Find Your Daily Supply Charge
Every electricity bill includes a fixed Supply Charge.
This covers:
- Connection to the electricity network
- Meter maintenance
- Grid access
Even with solar, you’ll usually continue paying this daily fixed fee.
Check Your Electricity Rate
Look for:
- Cost per kWh
- Daily supply charge
- GST
Example:
| Charge | Cost |
|---|---|
| Usage Rate | 34c/kWh |
| Supply Charge | $1.15/day |
The higher your electricity rate, the more valuable every unit of solar energy becomes.
5. See If You Already Receive a Feed-in Tariff
If you already have solar, your bill will include a Feed-in Tariff (FiT).
This is the amount your retailer pays for excess electricity exported to the grid.
Current feed-in tariffs vary across Australia and are generally much lower than the cost of buying electricity, making self-consumption increasingly important.
Identify Seasonal Changes
Compare bills from:
- Summer
- Winter
- Spring
- Autumn
Air conditioning and heating often cause major seasonal increases.
A properly sized solar system should account for these changes.
Review Your Billing History
Many retailers include a graph showing electricity usage over the past 12 months.
This helps identify:
- Increasing energy use
- Lifestyle changes
- Growing household demand
- Future energy needs
Think About Future Electricity Usage
Your future electricity consumption may increase if you plan to add:
- Electric Vehicle (EV)
- Pool
- Air conditioning
- Heat pump
- Home office
- Electric cooking
- Battery storage
Planning ahead helps ensure your solar system remains suitable for years to come.
Check if You’re on the Best Electricity Plan
Many Australians pay more than necessary because they’re on outdated electricity plans.
Before installing solar, compare:
- Electricity rates
- Feed-in tariffs
- Supply charges
- Solar-friendly plans
The right energy plan can increase your overall savings.
Use Your Bill for an Accurate Solar Quote
A reputable solar installer will often request your latest electricity bill because it helps them:
- Calculate your annual electricity usage
- Recommend the right solar system size
- Estimate annual savings
- Determine battery suitability
- Calculate your expected return on investment
Providing your bill results in a more accurate and personalised recommendation.
Common Electricity Bill Terms Explained
| Term | Meaning |
|---|---|
| kWh | Amount of electricity used |
| Supply Charge | Fixed daily network connection fee |
| Usage Charge | Cost of electricity consumed |
| Feed-in Tariff | Credit for exporting solar power |
| Peak | Highest electricity price period |
| Off-Peak | Cheapest electricity period |
| Shoulder | Mid-priced electricity period |
How Solar Can Reduce Your Electricity Bill
A well-designed solar system can help you:
- Reduce reliance on expensive grid electricity
- Lower daytime energy costs
- Protect against rising electricity prices
- Increase your home’s value
- Reduce carbon emissions
- Save thousands over the lifetime of the system
The greatest savings typically come from using the solar energy you generate rather than exporting it to the grid.