From 1 July 2019, new regulation replaced the old Standing Offers with Default Offers across most of the National Energy Network. There are two kinds of Default Offer:

DMO rates are expressed as a single dollar value for a set annual consumption level, rather than as a price per day plus a price per unit of usage.
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In Victoria, VDO rates are expressed as a price per day plus a price per unit of usage.

Retailers are free to market and sell Market Offers, but they must make the VDO price available for those who want it.
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Both DMO and VDO set a cap on the price a customer will pay when they have not entered into a Market Offer with their retailer. They also set the benchmark against which any discounts offered in Market Offers must be expressed.

Bill Hero results include calculating how each plan compares to the relevant DMO for your state.

In Victoria, the DMO is specified as a price per kWH and a daily supply rate, which is analogous to how single-rate plans are priced.

For single rate and single rate + controlled load tariffs, Bill Hero includes a calculation of how each plan compares, in terms of % higher or % lower, to the DMO price calculated for the same usage a time period for your bill.

Outside Victoria, the DMO is specified as a single price for a set annual kWh consumption level. Bill Hero calculates the % above or % below DMO by separately calculating what each plan would have cost at the reference kWh consumption level for 1-year duration.