Building 5 operational. The [transmission line construction notice](https://www.aeptransmission.com/ohio/docs/Hartman%20Farms%20Extension%20No.%202%20138%20kV%20Transmission%20Line%20Project%20Construction%20Notice.pdf) that expands site by 100 MW is assumed to be entirely for Building 5, and has an in-service date of July 1, 2027 (page 3). Estimate taken on the safe side based on completion times for Building 3-4 from when roof was complete.
Power (MW)
464.0
IT Power (MW)
386.0
H100-equiv
320,869
Cap-Ex ($B)
$14.80
Buildings Operational
5.0
Water (MGD)
—
Notes
Google Columbus is currently a 5-building campus in Ohio. Power capacity was estimated by factoring in both cooling as well as a permitting in the form of a [transmission line construction notice](https://www.aeptransmission.com/ohio/docs/Hartman%20Farms%20Extension%20No.%202%20138%20kV%20Transmission%20Line%20Project%20Construction%20Notice.pdf), which gives detailed breakdowns of current capacity and planned capacity. The compute capacity is based on this power capacity and the energy efficiency of Google TPU chips that are available when each building becomes operational.
- [DCD article detailing early work beginning on the site ](https://www.datacenterdynamics.com/en/news/google-breaks-ground-on-columbus-ohio-data-center/)
- [Transmission line construction notice; details current site capacity, expansion, and maximum future site capacity ](https://www.aeptransmission.com/ohio/docs/Hartman%20Farms%20Extension%20No.%202%20138%20kV%20Transmission%20Line%20Project%20Construction%20Notice.pdf)