# How we calculate your savings

There are three main savings calculations used in the Bill Hero service:

## Bill Savings

We use the detailed data from your bill to calculate what you would have paid for that same usage with the same tariff type over the equivalent time period under all the relevant publicly available plans on the market.

We include tariff type, solar feed-in, guaranteed & conditional discounts, and incentives.

The difference between what you were actually charged in your bill vs the best available price you would have been charged under an alternative plan is the Bill Savings.

Bill Savings calculation uses the  historical consumption and bill period data as documented in your bill to calculate what you would have been charged under each of the currently available plans. It's possible that the current pricing may not have been available during the billing period under consideration. That's why we refer to this as 'equivalent' time period.

## Annualised Savings

In your results for each bill analysed, Bill Hero expresses savings as an annualised amount by applying the Bill Savings pro-rata over a full year. Annualising the savings result aligns the savings with the annual subscription period, which makes it possible for us to provide the Savings Guarantee.

For example, if Bill Hero finds \$10 savings in a single monthly bill, this would be expressed as \$120 annualised savings. We actually calculate Annualised Savings on the number of days in the bill cycle rather than months, but you get the idea.

#### Electricity Annualised Savings formula

Electricity Annualised Savings = Bill Savings x 365.25 / Bill Days

For gas savings, the annualisation calculation takes into account seasonal variation in gas consumption, based on an index of average seasonal gas consumption by climate zone. The indexed values are based on seasonal gas usage data published by the AER.

#### Average Gas consumption index values

 State Autumn Summer Winter Spring Queensland 0.94 0.69 1.36 1.01 New South Wales 0.88 0.55 1.57 1.00 ACT 0.85 0.27 1.86 1.02 Victoria 0.79 0.36 1.83 1.02 Tasmania 0.79 0.29 1.88 1.04 South Australia 0.79 0.50 1.62 1.08 Official Aust Season periods March, April and May December, January and February June, July and August September, October and November

#### Gas Annualised Savings formula

Gas Annualised Savings = Gas Bill Season Savings x 365.25 / Gas Bill Season Days / Gas Seasonal Index value

Where the gas bill period spans across two or more seasons, Bill Hero will split the total bill duration days into season days to find the proportion of the billing period in each season, then use the same proportion to split the total Gas Bill Savings into Gas Bill Season Savings, and apply the relevant Seasonal Index value for each Gas Bill Season Savings value.