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| The “9s” of reliable power | |||
| Reliability | Ok for | Expected disruption per year | |
| three 9s | 99·9% | homes | 8 h |
| four 9s | 99·99% | factories | 69 minutes |
| five 9s | 99·999% | hospitals airports | 5 minutes |
| six 9s | 99·9999% | banks | 32 s |
| nine 9s | 99·9999999% | online markets | 30 milliseconds |