it makes sense
I really don't see why everyone is so supprised. The more energy they generate from other means the more of the black sticky stuff they can sell (or sit on and wait for the price to rise). They have a large amount of capital now why not invest it in the means to be self sufficient when the wells do run dry?
Add in the side benifits of a little bit of greenwash after all they are getting the kind of publicity that money can't buy with this anouncement!