I am using Ubuntu Linux, so far with just a test setup using an old nVidia GPU (yes I know ...)

My problem is that we have a "Time of Use" electric power plan - US$0.20/Kwh from 1pm to 8pm weekdays and US$0.066 /Kwh at all other times.

This seriously impacts the potential profits from mining, so I want to throttle back/turn off the GPU during the "peak hours". Especially if I invest in a high power GPU for actual mining!

Best guess so far is to have a cron job which starts/stops the miner during peak hours.

Does anyone have a better solution?