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Question
Ordinance No. 2012-06 of the City of San Miguel requires all new buildings within city limits to install rooftop solar photovoltaic systems capable of generating at least 15% of the building’s daytime energy demand and to enroll in the city’s energy registry; it also imposes a modest annual permit surcharge to fund enforcement. The national Building Code and an accompanying Energy Efficiency Policy encourage renewable energy adoption, and there is no express preemption clause in national law. (a) Identify the central doctrine governing local autonomy that applies. (b) Distinguish the controlling rule on preemption versus local regulation. (c) Apply to the facts: Is Ordinance No. 2012-06 valid? Why or why not?