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If you are planning to install a battery to store your solar or a complete solar panels/battery system, consider  becoming a VPP (virtual power plant). I did & got an additional subsidy on my 18.4 kWh battery of $676.00. I joined Amber as the VPP Manager at a cost of $25.00 a month. Instead of getting just a few cents/kWh when the sun is shining & the rates are low, the system charges the battery till its full & sells the energy when the price is high. My average is 18.2c/kWh. All my costs are at wholesale rates so I pay the same to buy power as the Energy retailers. 

 

In Summer when there is too much solar in the grid the sale price goes negative. When that happens & my battery is full, the system curtails the solar production so none is exported. When there is a grid failure somewhere like a power station partial shutdown the spot price can go to $10.00/kWh or even more. When that happens the system will export energy at its maximum rate. In an hour I can be credited more than a couple of months electricity cost while helping to stabilise the grid.

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