Genesis Energy says it's comfortable with the transparency of its pricing and says it will fully co-operate with the inquiry the Electricity Authority has launched.
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Last week, lines company Vector said some consumers in Auckland have had letters from their retailers blaming price increases on Vector's line charges increasing.
Vector says its weighted average charges will in fact fall 2.4 percent from 1 April and that follows an 8.43 percent decline last year.
Wellington consumers have also been getting letters blaming price increases on lines companies. Genesis, for example, is raising its daily fixed charge from 101 cents to nearly 183.91 cents, an 82 percent increase.
Genesis chief executive Albert Brantley told Parliament's commerce committee his company has reviewed its communications with customers in the wake of the recent controversy about who is to blame for rising energy prices.
"We're pretty comfortable that we've been very transparent in what has driven the changes in relation to transmission and distribution charges and our charges," he said.
Mr Brantley said Genesis was fully prepared to cooperate with the Electricity Authority review.