I did a quick quote on coinwarz:

SHA-256 Bitmain S9
13000 ghz (13Thz)
1350 watts
15c per kw

vs

SCRYPT Bitmain L3+
504000 kHz (504Mhz)
800 watts
15c per kw

The results are pretty interesting... based on the prices we're paying here in Australia for power (it's actually .20c per hour taking into account that the calculator is in US dollars)

Scrypt blows SHA256 out of the water... the top 29 coins are all scrypt! BTC comes in at rank 30. Yes I know that this will likely change as the global hashrate and difficulty increases, but on paper it looks like mining scrypt may be fare more profitable.

Have I made an incorrect calculation?