Pros
Good pay, generous bonus structure, and 401k benefits. It's not too hard to stand out from the crowd if you are highly proficient, motivated, and have some people skills. Certainly room to move up the corporate ladder if you make a name for yourself. Nice fitness facilities. Offices are in a beautiful historic building. Lots of good people genuinely trying to make a difference despite the heavy bureaucracy/red tape.
Cons
Company prioritizes draconian operational expense cutting over becoming more innovative. Lots of 'old timers' that don't want to change and are all about self-preservation. More time spent on making PowerPoint slides and reporting on projects in several different ways instead of focusing on execution. Director level personnel with no direct reports that don't seem to have any other purpose than acting as another bureaucratic layer and hounding you for metrics. Some parts of the business are stuck in 1983. It's actually 10 companies doing business as National Grid. Lack of flexibility in work schedule.. old school mentality where you need to be seen even though you are much less productive.