Do solar power and energy efficiency go together like lox and cream cheese?

TreeHugger has been looking at the issues of solar power vs energy efficiency for years, how people pile solar panels on the roof to offset energy consumption instead of insulating, increasing supply instead of reducing demand. But since I first complained about this back in 2012 the price of rooftop solar has dropped in half. Under those circumstances, does it still make sense to tout efficiency over solar?

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