Can a tariff with free electricity hours actually leave me worse off?

Yes, it can. If the rates charged outside the free window are higher than on a standard plan, and your household draws significant power in the morning or evening, the total annual bill may be larger — not smaller — despite the free hours. The only way to know for certain is to model the full rate structure against your actual consumption data.

Does this affect households without solar as well?

It can, but the dynamics are somewhat different. Without solar generation, you have more daytime grid consumption to potentially displace during free hours, which may make the tariff more worthwhile. The key question remains whether you can reliably shift enough load into the free window to offset any rate increases at other times.

How does YSA help homeowners evaluate tariff offers?

We review tariff structures as part of our advisory service, comparing the full rate schedule — including off-peak, shoulder and feed-in rates — against a household's actual usage and generation profile. We do this work on your behalf so you are not relying on a retailer's marketing summary to make the decision.

Energy prices

When 'free' solar power actually costs you more

Some solar tariffs offer hours of free power but quietly raise costs elsewhere. Here's what Australian homeowners need to understand before switching plans.

Andrew TonkinLast reviewed 2 September 20264 min read

Short answer

A solar tariff offering several hours of free electricity per day sounds like an obvious win — but the fine print can leave households worse off overall. Analysis of at least one such offer in Australia suggests the structure may serve retailer revenue interests ahead of household bill reduction. For solar owners, the lesson is that headline features rarely tell the whole story.

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What these tariffs actually offer

Some Australian electricity retailers have started offering tariffs that include a window — typically a few hours in the middle of the day — during which grid electricity is supplied at no charge. The marketing logic is straightforward: solar generation is high at that time of day, wholesale prices are often low or even negative, and retailers can afford to give power away because it costs them little to source it.

On the surface, this looks like a reward for households with rooftop solar, or an incentive for households without it to shift usage into the middle of the day. The reality, though, depends entirely on what the retailer charges outside that free window — and on how your household actually uses electricity.

Where the numbers can go against you

The core problem identified in recent analysis is that the 'free' hours can be funded, at least partly, by higher rates at other times of day. If your household draws significant power in the morning, evening or overnight — when most Australians run dishwashers, cook dinner and charge devices — a higher off-peak or shoulder rate can easily wipe out whatever you saved during the free window.

For solar owners specifically, there is an added complication. If your system already covers most of your daytime consumption, you may have very little grid electricity to displace during the free hours anyway. The tariff's headline benefit may not apply to your actual usage profile at all, while any rate increases at other times hit you in full.

The structural tension this reveals

This is not simply a matter of one poorly designed product. It points to a deeper tension in how the retail electricity market works. Retailers are businesses with revenue to protect, and tariff design is one of the tools they use to manage margins. A tariff that appears generous in one dimension can be carefully calibrated to preserve — or even improve — the retailer's position overall.

This does not mean retailers are acting dishonestly; most tariff structures are disclosed in the plan's basic plan information document. The problem is that few households have the time or expertise to model how a given tariff will perform against their specific consumption data. That gap between what is disclosed and what is practically understandable is where households tend to lose money.

What solar owners should be thinking about

If you have rooftop solar, the right tariff question is not 'how many hours are free?' but rather 'what is my net annual bill under this plan, given my actual generation and consumption patterns?' That requires modelling your half-hourly consumption data against the proposed rate structure — something that is entirely possible but rarely done before a plan switch.

Feed-in tariff rates also matter here. A plan that offers free daytime grid electricity but pays a lower feed-in rate for your exported solar may cost you more in foregone export revenue than it saves in avoided grid consumption. Both sides of the ledger need to be assessed together, not in isolation.

How to protect yourself before switching plans

The practical answer is to treat any tariff with a prominent headline feature — free hours, flat rates, bill guarantees — with the same scepticism you would apply to any other marketing claim. Request the basic plan information document, check the rates that apply outside the featured window, and compare the total annual cost estimate against your current bill. If the retailer cannot provide a clear annual cost comparison using your actual usage data, that itself is informative.

At YSA, we review tariff structures as part of our broader advice process, so homeowners do not have to navigate this alone. Understanding whether a plan actually suits your solar system and usage profile is exactly the kind of analysis we do before making any recommendation — and it costs you nothing to ask.

When 'free' solar power actually costs you more

Short answer

What these tariffs actually offer

Where the numbers can go against you

The structural tension this reveals

What solar owners should be thinking about

How to protect yourself before switching plans

Primary references used for this guide.

Can a tariff with free electricity hours actually leave me worse off?

Does this affect households without solar as well?

How does YSA help homeowners evaluate tariff offers?

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