Rooftop solar
Estimate generation, energy used at home, grid exports and long-term savings.
Solar vs battery guideINDEPENDENT HOME ENERGY DECISION TOOL
The smartest energy investment is the whole picture.
Solar panels, home batteries, an EV, heat pumps or switching off gas? Find out which changes make financial sense together — and what happens if you do nothing.
New builds or retrofits
5–30 year outlook
Transparent assumptions
Whole-home energy planEXAMPLE
One decision changes anotherModel solar, storage, EVs and gas together
☀ Solar + daytime demand
⌁ What if gas prices rise?
01
Compare the alternativesIncluding the cost of doing nothing
02
See the interactionsAvoid counting the same saving twice
03
Decide what comes firstUnderstand trade-offs before spending
YOUR HOME, YOUR STARTING POINT
A better answer starts with your property.
There's no single best combination for every household. Tell us what you're working with and we'll preselect the right calculator inputs.
No obligation, no installer sales pitch.You can use estimates first and add real bills and quotes later.
ALL THE IMPORTANT DECISIONS
Six investments. One financial picture.
Upgrades can either amplify or reduce the value of one another. Compare them in the same household model, not six separate sales calculators.
Home batteries
Understand what evening storage saves after charging losses and replacement costs.
Explore battery economicsElectric vehicles
Compare petrol spending, EV charging, the car price difference and solar use.
Solar & EV guideHeat pump hot water
Compare replacement or construction costs with future gas or electric bills.
New build vs retrofitHome heating and cooking
Model electric space heating and induction cooking instead of gas.
Gas conversion guideGas disconnection
Include future gas price rises and fixed charges that disappear only after full conversion.
Check disconnection costsTHE QUESTION THAT MATTERS
What if you change nothing?
Doing nothing also has a future cost. Forecast your electricity, gas and petrol bills, then compare each upgrade with the same baseline.
- Separate energy-price growth assumptions
- Upfront costs and ongoing savings
- Net present value and breakeven year
- Individual upgrades and combined packages
- Printable, shareable private comparison reports
EXAMPLE REPORT20-year outlook
Your energy decisions, side by side
Illustration only. Your results are calculated from the figures you enter, not these example bars.
SIMPLE PROCESS, THOUGHTFUL ANALYSIS
Three steps to a clearer decision.
01
Describe your home
Start with a new build or existing property, then choose your electricity and gas supply situation.
02
Enter actual costs
Use your bills, tariffs, driving distances and contractor quotes. Estimates are fine to start with.
03
See the long-term impact
Compare each investment and combination over time, including fuel inflation and replacement costs.
START WITH FACTS, NOT A SALES PITCH
Know the numbers before you spend.
See how different energy investments affect one another — and your household budget.
YOUR QUESTIONS, ANSWERED
Common questions about home electrification.
Should I install solar or a home battery first?
Solar and storage do different jobs. Solar generates electricity; a battery shifts some surplus electricity to later hours. A battery only creates additional value when the avoided purchase cost justifies storage losses, capital costs and eventual replacement.
Does disconnecting natural gas save connection charges?
It can, but only once all gas appliances have been converted and the gas connection is properly disconnected. The calculator treats ongoing gas use charges separately from annual standing charges.
Can I compare a new build with an existing-home retrofit?
Yes. New builds compare incremental system costs against the planned baseline; retrofits consider the costs of changing systems already present in the property. An existing appliance near end-of-life may require a separate replacement-timing assessment.
Will the tool know whether my house can connect to gas?
No. An address lookup may locate a property or identify solar resources, but it cannot reliably confirm a gas or electricity network connection. Confirm service and connection charges with the appropriate utility.
Is this a detailed solar or battery system design?
No. The calculator is a financial screening tool using estimated consumption and solar patterns. Roof engineering, shading, local tariffs, electrical design and network connection requirements need independent verification.