lon Musk has gotten a lot of attention for his proposed efforts to rebuild Puerto Rico's electric grid, which could prove how cheap and valuable solar and energy storage could be in the decades ahead. Musk's plan isn't public yet, but it would likely mean bringing Powerpacks to the island to help deal with outages that still affect 90% of consumers. And this may be an instance where Tesla (NASDAQ:TSLA) could build a solution faster than most utilities. But Tesla isn't the only company eyeing solutions in Puerto Rico. Sonnen has said it will build microgrids on the island as well. This is potentially the first big test for solar plus storage as a fast solution to island infrastructure challenges.