Metering power in data center

[Jay Nakamura <zeusdadog () gmail com>]

I am looking for suggestions on devices that can
monitor(A)/meter(kw/h) power usage in a data center.  Getting a
metered PDU everywhere seems a little expensive and cumbersome.

Are there devices you can wire into breaker box to meter each AC circuit?

Thanks in advance for any suggestions.

-Jay