Sorry, I was able to figure this out, and it seems that adding "Output:meter, 'my_custom_meter_name', Timestep;" and calling a meter through a custom Output:Table:Monthly object would indeed get these results to report as part of the eplustbl.htm file. So the way to report any meter:custom output is to first create a meter:custom object, create an Output:meter object which references the meter:custom object, and then include this meter as part of a custom Output:Table:Monthly object. I am going to leave this question here, since other similar questions do not specifically address this whole process of moving from creating a custom:meter to reporting its output in a table in the .htm file. However, if someone has other thoughts, please feel free to comment, and I'll delete it! Thanks.