Northwest offers its customers an opportunity to review its major tariff filings prior to filing them with
FERC. Northwest asks that you provide any comments or concerns on or before February 18, 2020, so
Northwest can respond prior to the filing being submitted to FERC. Please direct comments and concerns
to Dave Madsen (801-584-6864).
The purpose of this filing is to expand Northwest’s tariff (“Tariff”) language regarding renewable natural
gas (“RNG”) in order to support the Pacific Northwest regions’ efforts to reduce its carbon footprint.
Recently published reports by Oregon and Washington show that they each have the potential to
produce approximately 10-15 Bcf/year of RNG via anerobic digestion. While not all of this potential RNG
supply will be connected to an interstate pipeline, due to either the lack of proximity of the RNG source
and/or the inability to produce enough RNG to justify the connection costs, Northwest welcomes and
anticipates a portion of this RNG supply will be positioned to flow on to its system for distribution within
the western U.S.
Northwest’s proposed Tariff language will permit RNG sources to have up to a four percent inerts
substance level and a minimum 970 BTU level when Northwest, in its reasonable judgement, determines
it can blend the RNG supply with other gas supplies and still meet its Tariff’s gas quality delivery
requirements. Northwest’s Tariff, however, will specifically prohibit receipt of RNG from hazardous waste
landfills.
A draft copy of the proposed filing is available on Northwest's website under Regulatory/Proposed Tariff
Filings at the following link: http://www.northwest.williams.com/NWP_Portal/
dm/bd