365 Main Customer,

At 1:49 p.m. on Tuesday, July 24, 365 Main's San Francisco data center was effected by a power surge caused when a PG&E transformer failed in a manhole under 560 Mission St.

An initial investigation has revealed that certain 365 Main back-up generators did not start when the initial power surge hit the building. On-site facility engineers responded and manually started effected generators allowing stable power to be restored at approximately 2:34 p.m. across the entire facility.

As a result of the incident, continuous power was interrupted for up to 45 mins for certain customers. We're certain colo rooms 1, 3 and 4 were directly affected, though other colocation rooms are still being investigated. We are currently working with Hitec, Valley Power Systems, Cupertino Electric and PG&E to further investigate the incident and determine the root cause.

All generators will continue to operate on diesel until the root cause of the event has been identified and corrected. Generators are currently fueled with over 4 days of fuel and additional fuel has already been ordered.

We understand the seriousness of this issue and will provide full details once they come available. We sincerely apologize for the impact this has had on your operations.

Regards,
Vice President, Security
365 Main
"The World's Finest Data Centers"