Energy used by 90W power supply with no load

I use a ThinkPad T60p in a corporate environment. I have it connected to mains power via an energy meter. The meter tells me that the power supply (90W 20V) is consumes 7 watts when it is not even connected to the ThinkPad. I have also tested colleague's power supplies (the same model). When they are not connected to a ThinkPad they consume 0 watts. Can anyone explain what could be causing this? Is my power supply working as designed?
p.s. You might think that 7 watts is no big deal, but I am keen to minimise the energy that I waste.
Solved!
Go to Solution.

The power supply will always consume some energy when plugged in as there is internal circuitry which is always running, however 7 Watts is definitley an excessive "no load" reading and indicates that the power supply is faulty.
If your energy meter has a reading granularity of whole Watts only, then the supply should indicate 0 Watt energy consumption when it is not plugged into a ThinkPad, though in fact it will be drawing some faction of a Watt for the internal circuitry. 
Cheers,
Bill
I don't work for Lenovo

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