Equipments for buying and selling electricity

[wibo]

I would like to know more about the equipments for buying and selling electricity. If somebody could help me to know where can I get this information, please let me know.
Thank you.

 

[peebee]

Power meters?

They meter power. What else do you want to know about them?

 

[busbar]

At the other extreme, see places like caiso.com