You also need to consider that solar/wind+battery needs to be massively overbuilt to get reliable power because of the variability, both day to day and seasonal

You also need to consider that solar/wind+battery needs to be massively overbuilt to get reliable power because of the variability, both day to day and seasonal. More sophisticated analysis needs to recognize that as your percentage of power from solar/wind approaches 100%, the amount of overbuilding required rises very rapidly. See e.g. https://www.technologyreview.com/s/611683/the-25-trillion-reason-we-cant-rely-on-batteries-to-clean-up-the-grid/ https://www.technologyreview.com/s/611683/the-25-trillion-re...