Tesla has been shipping hundreds of its residential batteries, the Powerwall, to Puerto Rico. This way, residents who already have solar panels installed on their houses can use the batteries to restore power while the electrical grid is still down.
But with so many people in need of power, it's no surprise that demand has far exceeded supply. It certainly doesn't help that some third-party installers are charging excessive premiums, Electrek first reported.
Some locals told Electrek that installers have charged as much as $12,000 for a Powerwall with installation. The $6,200 Powerwall typically costs between $800 and $2,000 to install, according to Tesla's website.
Musk said on Friday that Tesla always charges the same price for a Powerwall and will stop shipping units to installers charging excessive premiums.
He added that the internal Tesla team on Puerto Rico is very small and the company is working to send more experienced installers to train and hire locals.
Tesla always charges the same price for a Powerwall (only taxes & shipping costs vary), so something is messed up here. I've asked my team to stop shipment to any installers charging excessive premiums.-; Elon Musk (@elonmusk) October 6, 2017
The internal Tesla Powerwall install team in PR is very small right now. Sending experienced installers from continental US to hire & train local team as fast as possible.-; Elon Musk (@elonmusk) October 6, 2017
A Tesla representative declined to comment beyond Musk's statements.
Musk said increasing battery supplies was a top concern after speaking with Puerto Rico Governor Ricardo Rossello, who said he was interested in using Tesla's commercial batteries, the Powerpack, and solar panels to rebuild the island's electrical system.
Hurricane Maria, a Category 4 storm, knocked out power for the Puerto Rico's 3.5 million residents, and they may not get power again for another six months.
This post originally appeared on Business Insider.