This block would basically have input and output (with options to specify which sides would be which using Create's Wrench).
At the front side it would display 2 values:

1. Currently transmitted power (like FE/t)
2. Total transmitted power (like FE) - it would work like electricity meters like this, which everyone has in their homes. This value would be preserved after breaking the meter block and would be cleared after placing it in the crafting slot.

Also would be nice to see some mechanism to lock this meter blocks, so only player which locked it could of course unlock it, break it, change input/outputs or clear total transmitted power from it

I'm creating server based on Create and I'd like to provider players easy option to sell their power for other players

I would love to see this in the mod!

Combine this with a ComputerCraft (CCTweaked) API then you can automatically send meter readings to the energy company. Then using the Redstone Relay you can remotely turn off customers' power if they do not pay.

Similar to #90

Or just add the ability for display links to read stats from alternators like FE/tick and maybe from accumulators (total charge, FE change per tick).