The Punta Lima wind farm was significantly damaged, losing approximately half the turbine blades and sustaining vertical post damage, the report said. The Santa Isabel wind farm was "seemingly intact."
Wind farm repair costs are estimated at $25 million and solar farm repairs at $40 million, which could take approximately nine to 12 months. The cost to deploy microgrids is estimated at a little more than $1 billion and solar installations are recommended for new construction at a cost of $315 million.
The report did not include information on how the grid restoration and modernization efforts might be funded and Governor Cuomo's office did not respond to a request for comment.
Defaulting on $9 billion of debt, PREPA filed for bankruptcy July 2, 2017.
The Puerto Rico Energy Resiliency Working Group consists of PREPA and New York utilities, US government entities, trade groups, research organizations and Navigant Consulting.