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They already go negative in Australia quite regularly, almost always because of solar.

This argument really grins my gears.

When does the retail customer ever pay a negative price?

Well I think there is a difference in Energy Production Cost, and Consumer Retail Price. There are distribution, storage, etc in between. So it may likely never be negative.

But I am wondering if Solar is clearly trending towards zero. Why aren't more Solar farm being installed? I dont read any where that Solar Panel or installation are reaching max capacity. Is it simply because of storage problems?

If solar is tending towards zero there is some point where it will never payback. And really any subsidies should always be included in these calculations.

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