I don't think it's a new idea, but can't find any prototype else. I feel it's pretty difficult task.
1. Visualize real-time resource consumption by particular buildings in a local area. For example if all lights in your home are turned off it will immediately be mapped online and measured in terms of energy save.
2. Gamify the system to change people habits, e.g. points for less electricity consumption comparing with other buildings. In other words, try to make energy saving more fun.
3. Engage as many users as possible and start to analyze results 8)