NJ's total power capacity is about 19,000 MW so 380 MW would represent about 2% of the total. However, that is peak generation rather than usage.
NJ consumption is about 64 TWh per year. How many Wh are generated by the 380 MW of installed solar in NJ depends alot on siting, whether the panels track the Sun, et cetera. It could be anywhere from about 0.4 TWh to 0.9 TWh. Thus, we are most likely talking about ~1% of annual usage.
However, given an installation rate of 40 MW per month (which assumes the exponential growth in installation rate suddenly stops) that'd be an increase of about 1% of total usage per year. If the installation rate continues to increase then the goal of 22.5% (or 30% before Christie changed it) from ALL renewables (not just solar) by 2020 seems plausible.
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