And, if these tariffs stand, the US will be at a 30% cost disadvantage in all of these areas, until at least two or three years after the tariffs end, perhaps as long as ten years. This will be a crippling disadvantage for US economic development; entrepreneurs in these industries will wisely avoid investment in the US.
Edit: the actual ruling is https://ustr.gov/sites/default/files/files/Press/fs/201%20Ca... and the tariff is 30% in year 1, 25% in year 2, 20% in year 3, and 15% in year 4. So it doesn't quite reach the mid-2020s when photovoltaic installation really skyrockets, but it seems likely that this tariff will be renewed and extended.
Edit: I added a comment at https://news.ycombinator.com/item?id=16209749 with calculations about the physical size of the panels needed for the energy-source transition.
† I say this advisedly. I am well aware the Trump Administration has withdrawn from the Paris Accords; nearly started a second nuclear war, this one with North Korea; implemented a Muslim travel ban; and officially withdrawn from the TPP, although that was almost dead already. I am seriously arguing that handicapping the US economy in this way is at least as significant as these.