A three-hundred-dollar solar panel that plugs into a wall outlet can begin cutting your electricity bill the same afternoon you unbox it. No permit. No installer. No roof work. More than a million of these systems are already running in Germany, sold in supermarkets alongside kitchen appliances. In the United States, the same technology is running into a wall of utility regulations that were designed for a different era — and the collision tells you everything about who really controls your electricity. 
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