Renewable Natural Gas

Hello,

I am working on an RNG pathway and found this post thread very helpful. Thanks for the information already provided.

One remaining question I have is about finished fuel transport distance. I noticed you did not list it as an input in the above response, and the default input is 1 km by pipeline.

For an application where the RNG is produced and injected into the grid in one region and low carbon fuel credits claimed in another, I have been erring on the conservative side and entering the distance between the two locations (I know that physically this is conservative as no gas actually travels that far.) However, when I do things that way, I get a very large adjustment for fuel distribution emissions - almost as large as if I assume shipment by rail. The other issue I see with modeling this way is that my entire transport energy calculation is stuck using the originating region electrical generation defaults, despite the fact that the pipeline would span multiple regions.

Is the intention in the RNG pathway to only account for the pipeline distance to the grid injection point, hence the low default value? Or is there a different set of assumptions you would recommend?

Thanks!

Hello Don,

Thank you for all the information already provided in this post. On this topic, I was wondering what differences are considered between the LFG -> RNG fuel pathway vs other RNG pathways in the model (e.g., from AD or Organic Waste) that have a negative 'emissions displaced' value.

Does the LFG -> RNG pathway consider CO2e emissions avoided by gas capture of LFG? Or is that component not included in the pathway scope/covered in other RNG pathways.

Thank you in advance.

Hi Don,

Does the AD pathway apply to any livestock manure, or is it limited to dairy and swine like California?

Thanks!

This is very helpful - thank you! When do you expect the next version to come out?