AntminerS9 is available on Hashnest with lower electricity fee

[hashnest]

HashNest released the most efficient hashrate AntminerS9 officially on 7/12/2016 Beijing time.
Specifications as below:

Hashrates: 12.5T
Power: 130W/T
Price: $1699
Electricity fee: $0.234/THS/Day
Meanwhile HashNest dropped down the electricity fee for both AntS7 and AntS9 respectively.

Details: https://www.hashnest.com/hash_currencies/27/shop

[tbonetony]

Interesting. BUT,

Power consumption is bumped up by 30% while electricity cost is reduced to 25%.

My math is BAD: (before reduction) $0.10 x 0.75 x 1.3 = $0.975 / kwh

So technically your electricity is only reduced by a mere 2.5%.

YES i am aware you or someone else may argue 130W is rated at wall. Nevertheless, how is this 30% bump justified as per your advertised powerfulness of S9?