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Yes it is. It is reducing the need for electricity, reusing the sun's energy and recycling in as well.
Reducing energy use is called energy conservation and efficiency is the percentage of energy that is actually used to perform work the rest of energy that is '' lost '' to the surrondings.
I am not sure what exactly you expect. No: You can't violate the Law of Conservation of Energy. Yes: An electrical signal can be amplified - if you provide the power to do that from some source. Also, without input of additional energy, with a transformer you can increase the voltage (while reducing the current), or increase the current (while reducing the voltage).
Insulation allows buildings to retain heat or to reduce the heat coming into the building. This helps to preserve energy resources by reducing the amount of energy needed to heat or cool the building.
Since power = voltage2/resistance, reducing the resistance will increase the power of the circuit. Incidentally, power is not 'consumed'; it's energy that's consumed.