[aspanu]

I thought that too on the graph, but I think that's a bug in labeling. When I look at the actual scale, that colour appears to be nuclear (and the other straight line is geothermal). This also makes more sense as they are sources that actually cannot be turned down to respond to electricity demand the way in which natural gas can.

[gpm]

I see 1.14 GW nuclear, and 1.1 GW natural gas at 12:20 PM PST, the nuclear is a flat line at the bottom of the graph (and I agree it makes sense), the natural gas is a dark blue section in the middle-ish, which shrunk from ~3GW overnight and does vary with time.

I don't think that what I'm seeing suggests a bug with labeling.