 PORTLAND, Ore.--BUSINESS WIRE--Northwest Natural Holding Company NYSE: NWN NW Natural Holdings announced today it will issue its second quarter and year-to-date 2021 earnings release and conduct an analyst conference call and webcast to review results at 8 a.m. Pacific Time 11 a.m. Eastern Time on Thursday, August 5, 2021. To hear the conference by webcast, log on to NW Natural Holdings corporate website at ir.nwnaturalholdings.com. To hear the conference call by phone, please dial 1-8 