Energy Elephant is simple to use, just upload your energy bills and it will show you how much energy you can save. There are pie charts showing Kwhs consumed per day, cost including tax, bar chart of consumption in terms of carbon footprint. the android app of energy elephant is good.
some times there are technical glitches in android app, take a photo doesnt work properly, there can be more features that can be offered like a desktop app and direct integration between the app and desktop, predicted consumption for future months can be added
you could definitely use energy elephant and benefit from it.
for energy consumption expenditure tracking, using energy elephant given us some potential energy saving options .