[mikiem]

I am seeing a lot of comments about the need for stable power. It seems logical, but it’s not an absolute need. I managed a data center win San Diego at the time of the California electrical power crisis [1] near the end of the Dot Com days. I have operated more than one at a time since. During those times, which produced rolling blackouts, we just ended up running our generators more often. Power outages in Data Center happen during maintenance and upgrades, not so much during power grid outages. I have still never never had a data center go down during a power grid outage… but have seen many during upgrades, and maintenance.

In the years since the rolling blackouts, I have been colocated in data centers that have made the decision to use special pricing available from the power utility, available when you can have a preemptable load… during peak hours of peak season the power company can tell you to get off the grid with short notice. The data center operators did OK when they did this for most years. They got a lower price on power all year, in exchange for running their generators more. I’d say that the typical year, they ran the generators for several hours per day for 7 to 10 days in the Summer months. The last year they dd this, they ran a much higher number of days than expected… maybe 15 - 18 days from noon to 7pm. I understand they had to stop doing this because of the pollution of the generators or the permits required for such heavy usage... but that info is not first hand. It could have been many other reasons such as neighbors complaining about the noise in the business parks (2MW diesel generators are deafeningly loud), costs related to running the generators for so many hours, etc.

To operate like this, you have to be on your game for maintenance of the generators and checklists and training. You also have to have multiple contracts with fuel delivery trucks, just incase your outage lasts for a while. These data centers were all under 5MW in size each. We never lost critical load during a power supplier outage. I hope I have illustrated that a reliable power supply is not strictly required to run a reliable data center or service that is dependent upon a reliable data center.

[1] https://en.wikipedia.org/wiki/California_electricity_crisis