Hawaii’s electric system is changing with rooftop solar growth and new utility ownership

January 27, 2015

Source: U.S. Energy Information Administration, is an independent electric cooperative.

In December, (FPL). While FPL does not rely heavily on solar photovoltaics (PV) and other forms of renewable energy to serve its Florida customers, solar PV already plays a large role in Hawaii, and that role is expected to grow significantly over time. The Hawaiian Electric utilities’ solar PV programs continue to evolve as the utilities handle ever-larger amounts of customer-sited solar capacity on their small and isolated island grids.

The Hawaiian Electric utilities—.

The high electricity prices in Hawaii have made wind and solar technologies economically attractive alternatives, especially as their technology costs have come down in recent years. These factors have led to growing wind and solar generation on both the utility scale and in smaller distributed applications—particularly customer-sited rooftop solar PV.

Source: Hawaiian Electric, .

According to EIA’s , compared to an estimated U.S. average of 0.5%, according to the Solar Electric Power Association. The average capacity of residential net-metered PV systems in Hawaii has also been increasing as larger and more efficient PV systems are installed.

Residential solar PV additions have been slowed by the delays customers experienced in getting approval to interconnect new PV systems to the grid. The delays stem from circuits on the Hawaiian Electric distribution grids reaching levels of rooftop PV capacity that are 120% or more of the circuit’s daytime minimum load (see maps below)—a key threshold for Hawaiian Electric’s interconnection approval process. Once that threshold is passed, an interconnection study may be required before the new PV system can be approved, which has resulted in a .

Note: Data as of January 26, 2015. .

Note: Data as of December 23, 2014. .

Note: Data as of December 16, 2014. .

However, Hawaiian Electric recently entered a cooperative research partnership with the to clear its backlog of PV applications by April 2015.

Additionally, as a result of the research, Hawaiian Electric has proposed in a (PUC) to raise the allowable PV penetration threshold from 120% to 250% of a circuit’s daytime minimum load. But this change would also be accompanied by a decrease in the amount received by new net-metered PV customers for the excess electricity they send back to the grid. Instead of receiving the full retail rate (about $ .30/kilowatthour (kWh) for Oahu residential customers in January 2015), customers would receive something closer to Hawaiian Electric’s cost of avoided generation, which largely reflects the cost of purchased fuel. Hawaiian Electric states that the new rate would distribute grid operation costs equitably across solar and nonsolar customers and allow the distributed solar program to be sustainable. Many utilities around the country are similarly engaged in efforts to establish appropriate compensation rates for distributed solar customers while ensuring equitable costs to all customers.

In compliance with orders from the PUC, Hawaiian Electric’s for the state’s long-term energy future also include tripling the amount of distributed solar on its system, procuring energy storage projects (such as batteries) to help balance wind and solar supplies, and converting existing oil-fired power plants to use liquefied natural gas (LNG) that is regasified.

Principal contributor: April Lee

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