The US solar market is set to grow a by record-breaking 119 % this year according to GTM Research in its latest U.S. Solar Market Insight Report 2015 Year in Review, published in conjunction with the Solar Energy Industries Association (SEIA).
GTM Research forecasts that, led by the utility-scale segment, 16 GW of solar will be installed in the US in 2016, more than doubling the record 7.3 GW installed in 2015.
While utility-scale installations will represent 74 % of the installations for the year, the residential and commercial markets will also experience strong growth in 2016. In fact, the US is on the verge of the 1 millionth solar installation milestone.
According to the report, the rollout of new community solar programmes, new utility-led efforts to enable corporate procurement of offsite solar, and ongoing debate over the value of rooftop solar are three key trends that will drive solar demand throughout the year.
"In 2016, the rooftop solar economic outlook will depend not only on favourable outcomes to net energy metering debates, but customer-wide and solar-specific rate structure reforms that can impact savings due to solar as well," commented GTM Research senior analyst Cory Honeyman.
On the non-residential side, PV demand will be supported by a triple-digit megawatt pipeline of community solar projects. Colorado, Massachusetts and Minnesota will collectively install more than 100 MW of community solar this year. 
Looking ahead to 2017, the residential and non-residential PV markets are both expected to grow year-over-year, but the report cautions that US solar is still expected to drop on annual basis due to the pull-in of utility PV demand in 2016.
"As the double-digit gigawatt utility PV pipeline is built out in 2016, utility solar is expected to experience a reset in 2017," said Honeyman, noting that the market will shrink to a still-impressive 10 GW. "But between 2018 and 2020, the extension of the ITC will reboot market growth for utility PV and support continued growth in distributed solar as a growing number of states reach grid parity."
-The federal ITC provides a 30 % tax incentive on all solar projects. In December 2015, Congress extended the credit out to 2019 with a stepdown through 2022 and project completion deadline of 2023 for some projects.
GTM Research expects that by 2012 the US solar market will pass 100 cumulative GW, with an annual install rate of 20 GW or more.
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