This... doesn't have to be the case. Some markets already have way higher renewable penetration. Solar and wind represented about 20% of all generation in Calif

This... doesn't have to be the case. Some markets already have way higher renewable penetration. Solar and wind represented about 20% of all generation in California in 2018 (https://ww2.energy.ca.gov/almanac/electricity_data/total_system_power.html https://ww2.energy.ca.gov/almanac/electricity_data/total_sys...). In the UK this year, solar and wind are almost 25% of generated electricity (https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/811974/Renewables_June_2019.pdf https://assets.publishing.service.gov.uk/government/uploads/...) Incremental improvement and economic forces do matter. Solar is now cheaper than coal in many climates, and we are seeing the effects. Of course, there are still many problems to be solved. But we're also working on incrementally on solutions to those. For example, battery cost is falling precipitously. "grid scale battery" was not a thing a decade ago, now you see installations popping up regularly. I'd like to see cold fusion as much as the next guy, but dismissing incremental progress is foolish.