This study uses Hawaii as an illustrative case study in state level tax credits for PV. We examine the role of Hawaii’s tax credit policy in PV deployment, including distributional and tax payer impacts. Hawaii is interesting because its electricity rates are nearly four times the national average as well as has a 35% tax credit for PV, capped at $5,000 per system. We find that PV is an excellent investment for Hawaii’s homeowners, even without the state tax credit. For the typical household, the internal rate of return with the state tax credit is about 14% and, without it, 10%. Moreover, the vast majority of installations are demanded by households with the median income and higher. We estimate that single-family homeowner’s in Hawaii may demand as much as 1,100 MW of PV. There are, however, significant grid constraints. Policy currently limits PV generation to no more than 15% of peak load for any given circuit, or approximately 3% of aggregate electricity demand. Tax credits are therefore not likely to increase the overall deployment of PV, but rather spread the cost of installation from homeowners to taxpayers and accelerate the rate at which Hawaii reaches grid restrictions.

Published version:  Coffman, Makena, Sherilyn Wee, Carl Bonham, and Germaine Salim. “A Policy Analysis of Hawaii’s Solar Tax Credit.” Renewable Energy 85 (2016): 1036-043.

Leave a Comment

Your email address will not be published. Required fields are marked *

The University of Hawaii Economic Research Organization (UHERO) welcomes online comments to stories that are posted on our website or social media pages. Comments are intended to be a forum for open, respectful, and family-friendly discussion. UHERO reserves the right to remove anything posted on our website or social media pages that is deemed inappropriate. All comments are moderated and will therefore have a delayed post time.
Some guidelines (not an exhaustive list) we use when moderating/approving comments include:

  • Do not bully, intimidate, or harass any user.
  • Do not post content that is hateful, threatening or wildly off-topic; or do anything unlawful, malicious, discriminatory or defamatory.
  • Observe confidentiality laws at all times.
  • Do not post spam or advertisements.
  • Observe fair use, copyright and disclosure laws.
  • Do not use vulgar language or profanity.

UHERO may amend this policy from time to time.