[noreiley]

On the CAISO page, how can they get to negative CO2 emissions? I doubt this includes CO2 capture, so their math with exports must be shady, no?

https://www.caiso.com/TodaysOutlook/Pages/emissions.html

[cbhl]

It means they're exporting zero CO2 solar power and offsetting fossil-fuel-based-generation in the other state. You'll see that the imports value is also negative (implying exports).

[ZeroGravitas]

And also they know the CO2 values of the other grids which they display as a positive CO2 when importing electricity from them.