You need to be comfortable providing information to google and having them mine it. Application is called google power meter. I don’t opt into any of the realtime “share” features. Share with your friend, etc You can opt out any time. I will read thru the T&Cs, I would be more concerned about the real-time distribution of power data, e.g. someone can see if power is very low…you’re on vacation..etc.
I suppose they plan to mine the data, perhaps targeted advertising by solar power, or appliance companies. If you’re power consumption is much higher than your neighbors you my get targeted ads by energy efficiency “consultants”. THey will probably generate energy consumption maps perhaps as overlays to google earth, etc…..
Personally, I’m OK with that level of data mining.
For me the utility of tracking my power usage out weighs potential privacy concerns.