Using the Meter view in Sense, I was able to determine that my heat pump compressor had seized up, but was still trying to run every 3 minutes. It was pulling about 8kW for several hours during the early morning, so luckily I was able to turn off the hvac system and stop wasting electricity.
Sense also helped me discover when a technician pinched a wire under an access panel, which started to chaff and caused a short to ground. The waveform on the meter showed a very weird, odd spike that corresponded to the (old) heat pump trying to run.
https://community.sense.com/t/motor-stall-heat-pump-fan/11550?u=edison517
Pretty awesome that Sense can “tell” me I’m having electrical issues!