Real outages ran 1 to 3 hours. Estimates reach 4 weeks.^[1][2][3]

1. 1E-ISAC and SANS
2. 2ESET Research
3. 3Lloyd's and Cambridge

Real outages ran up to 4 days. One attack caused no outage. Estimates reach 18 months.^[1][2][3]

1. 1Congressional Research Service
2. 2Duke Energy
3. 3National Academies

Real outages ran 4 days to 11 months.^[1][2][3][4]

1. 1GAO
2. 2FERC and NERC
3. 3Energy Department
4. 4EIA

Real outages ran 20 minutes to 9 hours. One storm caused no outage. Estimates reach 2 years.^[1][2][3][4]

1. 1NERC
2. 2National Weather Service
3. 3NERC
4. 4Lloyd's and AER

Estimates reach 1 year or more.^[1][2][3][4]

1. 1EMP Commission
2. 2EMP Commission
3. 3NERC and Energy Department
4. 4EPRI

Army bases, 2017 order: at least 14 days. FORTRESS bases, official: 30 days. FORTRESS bases, reported: 90 days, not confirmed.^[1][2][3]

1. 1U.S. Army
2. 2War Department
3. 3Fox News