Keep adding the files the utility already gives you
Each new export becomes part of one continuous history. Older readings stay in place, so the record grows instead of starting over.
From utility export to review record.
The tool stays close to the source file so the result is easier to explain later.
Check the overnight baseline and the nights that break from it
You can see total kWh, the overnight baseline, flagged nights, and any sharp changes that show up after midnight.
Compare any two periods inside the history
Choose last year and this year, before and after a replacement, or any other dates. The comparison highlights large changes, baseline shifts, and the periods that match.
Keep the result for the next conversation
The saved review gives you a simple record of what changed and when, so you can come back to it without rebuilding the comparison.