What to do about small ratios in graphs

I have a circular graph that plots energy usage as a ratio of the maximum. At 100% the graph forms a full circle.

The problem with this is that most of the time, a user's energy is approximately 10% of the graph- and the graph looks terrible.

I have considered the following solutions:

• having bimodal a graph, switching colour set and labelling when under a threshold( average energy)
• applying a non-linear function (square root) to the input, so the ratio is over represented at small numbers and under represented at maximum numbers (range is between 0-1 of users maximum)

Each of these approaches has some undesirable qualities.

The usage is for home energy, so promoting the user to reduce their energy usage is a beneficial outcome.

Example: