to switch over to clean electricity, we get a pie chart that looks a lot like that, which is dominated by solar and wind. i guess the question is like, okay, the implementation mechanism here is that you pass a clean electricity standard, the local utilities have to do this. what happens next? how do they do that? what does it mean? >> well, it means two things. one is just a lot of building. building, building, building. so that's why -- that's where the extra costs come from is incrementally you are basically rebuilding a new electricity grid built around weather dependent sources. that involves a lot of new transmission lines, a lot of new technologies to balance power. a lot of new plant grid planning, all that kind of thing. so there is a ton of building. the second sort of vexing thing is if you want to meet these targets, you have to retire a lot of fossil fuel assets before what is technically the end of