SAN is better?
Really, SAN is better is it? Add another 40 Watts per fibre channel port, another few kilowatts per cabinet of jumped up Linux boxes that you spent £10k each for because it was called a 'data mover'.
And as for MAID, most of the power cost in a current corporate data centre is the fixed overheads of the building, controlled by the power provisioned to the kit, so even ignoring the issues of heavily virtualised storage keeping those 'idle' disks spun up, the massive power supply ratings of MAID systems mean they will chew through the power, spun up or not. If you want some greener storage consider internal SAS disks that actually shut down when a server is idle or maybe a nice big optical or tape storage array at a fraction of the power requirement.
Next time you are looking for storage and the vendor's green paint is still not dry, before buying the claims about reduced numbers of disks in their expensive box remember the cost / performance / energy argument is two sided for SANs and count up the energy and financial costs of all the 'junk that isn't disk' as well.