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Electric appliances get more efficient over time. Critical, electrical energy consuming appliances for buildings are lightbulbs, air conditioners, fridges, water heaters and space heaters. At any given time, any building has a legacy of obsolescent equipment. As the price of electricity goes up, the savings that come from replacing a single LED bulb in electricity can pay for the bulb within a short space of time, often within months. If you address insulation, windows, leaks, lighting, ventilation, in other words upgrade the building's envelope AND you install LEDs, geothermal heating, heat exchanged ventilation, solar water heating, as well as solar and wind for power, your building is now approaching net zero condition. The potential for improvement in a country's energy consumption is one of the largest opportunities to reduce energy consumption and one that is growing fast.