U.S. average generation profiles by fuel type

[bl-young]

We see a number of applications for providing fuel specific generation profiles at the national level, e.g., Electricity - COAL - US. At one point, I believe it was possible to create a version with aggregation to the entire U.S. (or at least I was able to do it with a few minor tweaks to the code). Do you anticipate still providing this option in the next release? The immediate applications we see for these mixes are as proxies to assess international grid mixes and to provide options for assessing changing U.S. grid mixes.