Update, November 30, 2011: Two more areas of Maui have been designated as having hit the peak for distributed generation.
According to a regulation set forth by the Hawaii’s Public Utilities Commission, home- and businessowners wanting to add distributed generation —solar or wind power, for example — will need to undergo an ‘interconnection study’ if their property is within an area with a high number of homes or businesses with existing solar or wind power systems. The interconnection study is designed to determine the area circuit’s ‘ability to accept additional distributed generation (such as photovoltaics) without adverse effects on others connected to the circuit’.
Homeowners and businessowners wishing to add photovoltaics are unlikely to have their system permits issued in areas that already have high concentration of photovoltaics and other distributed generation sources.
Though the majority of the state still remains well below this threshold, we recently received word from the Maui Electric Company that Kahului, Maui is one of the areas whose circuit is nearing the PUC-established peak of 15% kVA (kilovolt-ampere) supplied by distributed generation like solar and wind power. This means, effectively, that home- and businessowners in Kahului will likely be unable to add photovoltaic systems to their properties.
The following map shows the parts of Kahului that are within the ‘saturation area’. (Click the map to see a larger PDF.)

Obviously, these circuit caps present a serious hurdle to individuals and businesses looking to save money and become more sustainable by going solar and avoiding the ever-increasing electricity costs here on our islands. This is not a catastrophic event, but it will become increasingly problematic.
With a peak of only 15% permitted distributed generation on a circuit, our state will never reach the goal of 40% renewable energy by 2030.
For those effected by the PUC’s 15% peak regulation, we recommend organizing with your neighbors and contact your government representatives to urge them to make the PUC raise these limitations.
You may call Sunetric at 262–6600 with any questions or concerns – we’d love to talk to you.