Allocate state-level (99999) data from EIA-923

[grgmiller]

As the eGRID technical guide notes:

some generator-level net generation data are missing or not reported for various generators in the 2020 EIA-923. EIA aggregates these missing data to the state level by fuel type, but it is not possible to distribute them back to the generator level accurately.

This imputed state-level data is reported in EIA-923 as a "State-Level Fuel Increment" using plant ID 99999. We currently exclude this imputed state-level data from our calculations, and it is unclear if/how eGRID incorporates these data.

Thus we should

• [ ] investigate if/how eGRID currently uses these data
• [ ] Better understand EIA's methodology for imputing these data
• [ ] Consider integrating these data into our pipeline.

[grgmiller]

One thought - it is possible that this missing data is captured in the reported CEMS data