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Home Business News SA solar overload sparks huge power discounts - The Australian Financial Review

SA solar overload sparks huge power discounts – The Australian Financial Review

He said substantial savings would be available for customers who were able to shift their usage into the middle of the day, or who could add a battery to soak up and save cheap power during the solar peak.
SAPN introduced its “solar sponge” tariff on July 1 to combat the high levels of generation from rooftop solar panels in its low-voltage network. It allows households with smart meters to access a “super” off-peak tariff of about a quarter of the standard rate between 10am and 3pm when the power being pumped out by rooftop panels is so high that it can exceed demand in parts of the local grid.
IO estimates that a new customer on its “solar sponge” rates will get prices about 75 per cent lower than typical flat rates and 50 per cent lower than “time of use” rates offered by other retailers that reflect the fall in the SAPN network tariffs but not the lower wholesale costs.
However, customers on the full-blown “time of use” plan will also pay an extra charge during the evening peak-demand period, meaning it is suitable only for those who can shift the bulk of their usage whether pool pumps, batteries, electric vehicles or dishwashers and other appliances to the part of the day when it’s cheaper.
Mr Morris also expects the home battery market to be supercharged by IO’s retail offers as households are incentivised to add storage to access the midday tariffs.
Access to dynamic retail pricing that changes during the day is, however, limited to customers with a smart meter, which is about 20 per cent of South Australian households at present, although the number is growing as meters are replaced.
The issues arising with the sharp rise in rooftop solar generation in South Australia have been a concern for the Australian Energy Market Operator, which is moving to take more control of the system by securing the power to cut off rooftop panels if necessary during rare situations when the grid needs to be kept secure.
AEMO said in a report last month that to its knowledge, South Australia was the first gigawatt-scale power system in the world to approach zero operational demand during the day, because of high generation from distributed resources such as rooftop solar.
Australian Energy Regulator chair Clare Savage said in a recent interview that tariff reforms were a critical part of the plan to manage the growing issue of minimum demand on parts of the grid, which is why the regulator had approved of the SAPN “solar sponge” tariff.
The still-growing popularity of rooftop solar one in every three households in the state has panels meant the hollowing out of daytime wholesale prices often into negative territory was happening faster than predicted, Mr Morris noted.
IO Energy, which will team up with a licensed electricity retailer to launch its offers on August 1, expects to lure customers away from the main providers. The top six hold a dominant 95 per cent of South Australia’s household market.

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