Just had a chat with Linda from HECO. This is what transpired:
Hi Kyle,
There is no question that home charging is the least cost paid alternative, and it is less expensive mile-for-mile than fueling a typical gasoline powered vehicle. Fast chargers are provided for speed and convenience to counter range anxiety, not for the lowest price. The PUC is very concerned that Hawaiian Electric makes the DC Fast Charging rates fairer to all customers. Under the previous flat fee charging pricing structure, some customer with EVs with large batteries were paying much less than others. Changing to a consumption based pricing, equalizes the cost for all EVs who use the chargers.
When we first created the DC fast charging program almost 5 years ago, the pricing was established as a flat rate, rather than consumption based, due to some technical limitations at the time. However, the pricing was determined based on an assumed amount of energy consumption per session. Due to the proliferation of larger battery EVs, per session usage is much higher than that original estimate. Hawaiian Electric takes no profit on the DC fast charger program, but it needs to be a self-sustaining enterprise, or there is a chance the entire program may be cancelled in the future. As a regulated utility all rates must be filed and approved by the PUC, and they are very sensitive about costs being subsidized by Hawaiian Electric ratepayers.
However, we will be monitoring usage of the stations with this new price structure, and may propose changes if there are significant variations to the use patterns. Thanks for your support of electric mobility.
Thanks,
Linda