If you want to value the company Look at the multiples they are selling their assets at. That is the true value of the assets in the market at real time. Then think about the barriers to entry for a new utility. A competing company would have to lay 1000's of kilometers of pipe all over the country than convience a state to let them try to do that and get paid never going to happen. So what's that worth? A lot.
The multiples range from 5x ebidta for the c rap power assets in California to 27x for hydro assets. I think they'll get around 10x for the the mid stream.
If they sold the company for 10-12x their ebitda the company is worth between 13 billion - 15.6 billion. The barriers to entry kick back would be to assume the debt on top of that like ALA did with WGL.
The company currently trades a 4 Billion a total joke i'm surprised no one has made an attempt at a hostile takeover