Google is a pretty large and technically savvy advertising company that does search and a bunch of other things.

If energy costs are eating into their bottom line and they have the cash, why shouldn't they invest into new energy tech. Seems like a good business decision to me

"why shouldn't they invest into new energy tech"

Because amount of attention that top management have is limited.

Google would be better off if they focus on their core products.

For example, Search.