How easy is it for a financial institution, who probably doesn't even control their own datacenter or buildings, to opt into using renewable energy sources? See

How easy is it for a financial institution, who probably doesn't even control their own datacenter or buildings, to opt into using renewable energy sources? Seems like a big decision for an institution to make and a lot of beurocracy and political obstacles. For an individual who wishes to mine, they have a simple choice to make based on electricity prices. Is it profitable or not based on their current rate. Most miners will naturally exist where energy is cheap, renewable, and abundant. I'm making a hell of a lot of assumptions, though.