The idea of large scale battery systems to back up Solar and Wind power is all based on hype, for example the battery system recently installed in South Australia can supply enought energy to run South Australia for less than 2 minutes,

The advance battery systems have a limit number of times that they can be cycled (ie 500 times) before they require to be replaced, which will then leave us with a large toxic waste problem,

Currently according to power system engineers I have spoken to to get 100 MW supply from wind turbines you need to install at least 400 MW of capacity at a number of locations, and that hoping for every thing to work correctly and the wind is blowing at the right operating speed and direction. The life span estimate of wind turbines is between 15 to 20 years with many failing before that. according to some power industry sources nearly 1/3 of the wind turbines installed in the US are barely functioning, Where as a standard power station running on coal can run for 50 to 60 years if maintained correctly, neulear have similar life cycle .