Pros
I can only speak on behalf of the energy efficiency department as I am not familiar with the company as a whole - there are no pros.
Cons
No work life balance. You are expected to work 12+ hour days with no lunch break, or be looked down upon because you stepped away from your desk, then management will find you and interrupt you on your lunch. Beware of job descriptions, they will promise you a very detailed and challenging job however you will end up getting information fed to you that you simply regurgitate. Challenge is not welcome, according to upper management you are always wrong, even when you have a stronger educational background then your superiors. Very high turnover, no retention; probably due to the fact that HR has no idea what is going on in the departments. They do not give exit interviews and they are not available when you actually go to quit! Anyone applying for energy efficiency run for the hills, everyday is a disrespectful nightmare.