There are two ways to measure progress. One, that of measuring outputs, is easy. What actions have been taken to either reduce energy use or produce clean energy locally? For example, how many KW of energy are now produced from photovoltaic systems in the town.
The other, measuring outcomes is more difficult. Absolute reduction and increased production to a position of being a net supplier of clean energy is of course the goal but changes in population or economic activity can present a misleading picture of whether actions are truly leading to change.
We have yet to identify the best ways to measure progress and the best way to source that information.
This is a project in waiting.