By 11:30 a.m. Sunday, Chugach Electric’s outage map showed power was out to about 17,500 members, largely concentrated in the Campbell Airstrip, Huffman Road, O’Malley Road and Oceanview areas.

By midday Tuesday, more than 48 hours after many outages started, Chugach Electric Association was reporting about 1,100 customers without power and more than 100 individual outages. Residents on the ...