I use a Windows tablet always on for my emulator to run on. It uses ~4 watts/hr. I use chrome remote desktop to access it so I can leave it on its shelf.
Also, if I remember correctly someone said the ISY skill will work both ways one is ask izzy to (command), but will also be able to use "Alexa turn on/off" also. Could be wrong since I haven't really seen much official information on it.