Northwest Natural Holdings' (NWN) units, SiEnergy Gas and its gas distribution affiliates, reached a settlement with key parties in their Texas general rate case, the company said Wednesday.

The proposed settlement would resolve all items in the general rate case and provides for an $8.6 million increase in the annual revenue requirement, compared with SiEnergy's request for $12 million, the company said.

The deal remains subject to approval from the Railroad Commission of Texas, the company said.