The JWPA said that 109 turbines were installed at 22 sites in 2015.
It did not provide an onshore/offshore breakdown for the total.
The organisation expects 129MW to come online in the January-March 2016 period, but just 246MW for the full year.
A number of issues have been delaying Japanese wind development over the past several years.
“Importantly for this sector in the interim… is that the environmental impact assessment is streamlined even further and significant improvements are made to the overly-complex regulatory environment for offshore wind projects,” Tony Nicholson, an associate at law firm White & Case in Tokyo, tells Recharge.
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