However, if it's got sufficient resolution to give "15 second" updates, it seems you could train it to recognize certain draws: holding everything else constant, turn individual items on at exact cues given by the software.
(The software might even be able to form hypotheses about individual draws before they're exactly named. Then the user just goes in and recognizes certain steps on the constructed timeline: "oh, yeah, that's the hallway light I turn on when I get home from work, and that's obviously the electric dryer, and this random thing must be the refrigerator compressor coming on and off through the night.")