So "grid parity" is an illusory target, in a sense, because it is a moving target.

A lot depends on pricing structure for consumers.

If business/industrial electricity prices are fixed and predictable, then grid parity is the threshold where self-consumption becomes attractive. This is surely going to be a big deal in solar.

On the other hand, I wonder if there are industries which are able to make money consuming cheap power on an irregular basis? As a power sink when renewables drive spot prices negative, for example?

_{It is rightly acknowledged that people of faith have no monopoly of virtue - Queen Elizabeth II}