Fuel types of process energy

Just because something was awarded on one project does not mean that it will be awarded on another. In general 90.1 and LEED avoids comparing different fuels. For non-process energy uses the fossil fuel must always be the same in both models, so it makes sense that it should be the same for process loads too. Most of the time fuel switching does not save any energy use, just cost. Sounds to me as if the first reviewer made a mistake and should not have awarded the cost savings. Without knowing the details it is difficult to say for sure. Also the baseline for comparison can change when you are in a different location. I assume that you submitted this as some sort of exceptional calculation where you had to justify the baseline. The baseline is dependent on standard industry practice in that location. Based on what you have written, my opinion is that you should not have been awarded points based on comparing different fuels. Using a cheaper fuel is just plain common sense and should not be rewarded in LEED. Basing your claim on the fact that it was awarded before will not even come close to being enough justification for making the same mistake again. I know it is not consistent but it also does not make sense to continue to make the same mistake over and over for the sake of consistency.

Since this process load will affect other energy end uses you need to do the calculations in the modeling software to account for those impacts. I would suggest you do the additional model. So the baseline and proposed would have baseline process load and then revise the proposed and submit the results as an exceptional calculation. If you do the above you should not have the form issue you raise. Be sure to separate on different rows the other process loads which remain identical. If you lump it all together it will be potentially confusing for the reviewer.

Usually a document published by some sort of independent organization. It might be a trade association. A letter from the supplier could help but would likely be somewhat suspect by itself since they have a definite conflict of interest. So much depends on the specific strategies being pursued and the degree to which they are uncommon. The more uncommon the strategy the harder it is to justify a baseline most of the time. For example, using a high efficiency boiler for a process load would be common and easy to justify a baseline (90.1 minimum).