How to develop a good model for predicting electricity usage?
Adding as a answer instead of comment due to insufficient reps. 
Consider developing a model that can identify the pattern of electricity and water usage per house throughout the year. And predict the upcoming requirements. It will be a time series problem. This will help in maximising resource utilisation and better availability of resources among everyone.
Later, this can help in smart power and water distribution which is not yet applied.
If you want a bigger community working into this data set, you can share it online or provide it to Kaggle. Many people are out there ready to help in it.