The Hawaiian island of Oahu saw its third straight decrease in residential electricity rates in September, while other cities and islands reported mixed results when it came to energy pricing, the Honolulu Star-Advertiser reports.

According to the media outlet, Hawaiian Electric Co. announced on September 11, 2012, that the typical electricity bill for a household that used about 600 kilowatt-hours of electricity per month in Oahu dropped by $5.83 to $209.82 in September. This is compared with electricity bills of $215.65 the previous month.

The current effective rate of electricity on the island of Oahu is now 33.50 cents per kilowatt-hour, down 34.5 cents from last month's rates. This came on the heels of similar decreases in August and July.

In other parts of the state, Maui Electric Co. announced rates had fallen 34.9 cents per kilowatt-hour in September, compared with 35.40 cents in August. Across the island, the average electricity bill dropped by $3.18 to $218.12.

There is currently a push for energy deregulation laws in Hawaii, which advocates say would help the island bring down the tremendous cost of electricity.