info on comercial 277 power

Hey everybody, I am currently running in a 2500 sq ft steel building, with a 28x28 built inside of it . I power 20 1000w hydro farm hoods using AG POWER..(AGRICUTURAL RATING FROM PG&E STANDARD 240 ) I also run 2 small AC units and the power bill is right about $2200 per month($100 per light and $100 per AC)
I am moving to a wharehouse in town that is relatively new. My electrician has not come to check it out yet , but is confident that it will have "277 power" which he says ist type of power used in big buildings to make running all the lights more economical.

I sold the last setup to the owner of the building I am in now (why tear down a good thing?). so i am in the market for another 24 big ones right now, and if my new place does have this "277 POWER" I would like to know the following;
IS THIS GOING TO SAVE ME MONEY ON MY PG&E
WHAT BALLAST COMPANYS MAKE 277 BALLAST'S
HAS ANYONE EVER USED 277 POWER BEFORE /
IS THERE ANY DOWNSIDE TO USING 277 POWER?

Any insight on this topic would be greatly appreciated
thanks..