From what I have read we are looking at power outages between weeks and a couple years, and that current grids are not significantly protected. https://assets.lloyds.com/assets/pdf-solar-storm-risk-to-the-north-american-electric-grid/1/pdf-Solar-Storm-Risk-to-the-North-American-Electric-Grid.pdf What's up with this? However, magnetic field strength and orientation of incoming plasma – key ingredients in forecasting Earth impacts, can only be measured with a lead time of 15-30 minutes. Additionally, these satellites are all past their mission lives, and replacements are essential for monitoring solar activity in the near future. Improvement in forecasting Earth impacts will only be made by funding research targeted at predicting and continued investment in the infrastructure necessary to measure impulsive solar wind events. It seems to me that the biggest disruption would be due to a total lack of communication afterwards. No phones, no TV, etc. I think radio would probably be the most quickly reliable.Given the potential for large-scale, long-term economic and societal chaos, it is necessary to evaluate preparatory and mitigative measures. There are currently several space satellites in operation that can provide warnings of incoming CMEs on the timescale of hours to days, timescales that could allow grid operators to take preventative measures before the storm hits.