Over a thousand Unison customers were without power in "mainly rural" parts of Hastings and Napier.
Unison relationship and customer care manager Danny Gough said crews attended up to 500 customers in Hastings and 250 in Napier this morning, but the numbers increased throughout the day.
98 Eastland Network customers were also affected in Wairoa.
"It's nothing really major, just lots of smaller ones that requires are crews to move from one job to the next," Gough said.
"We've made good progress but then we have had other outages occurring, so the guys have certainly had a very busy day in very challenging conditions too."