As per a recent comment this thread is meant to voice contrarian opinions, that is anything this community tends not to agree with. Thus I ask you to post your contrarian views and upvote anything you do not agree with based on personal beliefs. Spam and trolling still needs to be downvoted.
With efficiency I meant the amount you pay per kilowatt hour. It's a variable that has seen consistent doubling every 7 years over the last two decades.
Space on top of most buildings is unused and there are huge deserts that aren't used.
Does the include the subsidies many governments have been providing to solar?