Electricity is 15p per KwHour round here
i'm not sure why you can't have a dedicated fileserver.
i put mine original fs together for $12.95. this fs is still
running, i just wanted to put together a diskless fs.
300w
echo 'scale=3; 0.15 * 0.3 * 25 * 365' | bc
410.625 pounds per year
60w
82.125 pounds per year