Repairing Puerto Rico's shattered electrical infrastructure with solar energy technology would be cost-effective and environmentally friendly, says Musk.
The famously secretive company will not discuss its problems beyond Musk's tweets and other public statements.
The Caribbean island, which has been devastated by Hurricane Maria, has seen electricity almost entirely wiped out, with hospitals, vital utilities and nearly 90% of the 3.5 million population still without power.
Last week, Rossello said his team is looking at alternative ways to bring power back on the island, including by using microgrids, small power networks that can work independently of the main grid. So, Musk is offering to help rebuild the US territory's entire power grid.
"@elonMusk Let's talk. Do you want to show the world the power and scalability of your #TeslaTechnologies?"
Australian website caradvice.com.au quotes Scott Miller, GM's director of autonomous vehicle integration, as saying Tesla boss Elon Musk is "full of crap" when it comes to claims of the level five capability of current and forthcoming vehicles.
Why? Given the emergency situation, Puerto Rico is in the middle of a race between repairing the current power grid and transitioning to renewable energy.
The installation is apparently the current bottleneck for getting the Tesla Powerwall in Puerto Rico so that initiative is likely to accelerate the deployment.
Musk also said Tesla would reschedule the unveiling of its semi-truck to November 16 as it focuses on fixing production issues tied to Model 3 and increases battery production for Puerto Rico.
There's also a big question mark over longevity, because lithium-ion batteries aren't usually used to provide baseload power, which would require frequent charging and discharging.
Musk responded: "Tesla will get the system installed and working 100 days from contract signature or it is free".