Last week, more than 800,000 Puerto Rico utility customers lost power when a single tree fell on a transmission line.
A month earlier, another line failure affected hundreds of thousands, while a substation fire crippled power plants in February. Then, there was the November blackout, which hit San Juan just as it celebrated the milestone of 50 percent power generation after Hurricane Maria last year.
Now it’s happened yet again.
An island-wide power outage shut down businesses April 18 and prompted the international airport to operate on generators. The island’s power utility said it could take 24 to 36 hours...