Tesla’s Powerwall can ironically create problems if you’re all-in on the company’s ecosystem. What happens if there’s a power outage and the battery pack has to juggle the needs of both your home and your EV? You might rest a little easier from now on. Teslerati reports that Tesla has released a Powerwall update that will coordinate with the company’s cars to prioritize charging during power outages. Charging will slow down if there’s a high load in your household during the outage, and will even stop entirely if the Powerwall dips below an “energy threshold.”

The feature is currently available to North American owners who drive a Model 3 or Model Y. You’ll have to be patient if you live elsewhere or drive one of Tesla’s higher-end EVs. If you do qualify, though, this could ensure that you aren’t left in the dark simply because your car was a little too thirsty during a bad storm.

As Pacific Gas and Electric blacks out power across wide swaths of northern California, Tesla CEO Elon Musk mentioned plans in place that could help Tesla owners during power outages. During past emergencies like hurricanes Irma and Florence, Tesla has used its OTA capabilities to give owners a boost, and its Powerwall can store additional power when it detects storms coming. People needing to charge their EVs might not be the same ones in most dire need of assistance while power is out, but it’s a consideration under these circumstances, and an emergency he may be able to comment on without causing a lawsuit later.

According to Musk, “All Tesla Supercharger stations in regions affected by California power outages will have Tesla Powerpacks within next few weeks.” He also said the company is adding Tesla Solar to its stations “as fast as possible,” so that drivers can get “24/7 clean power with no blackouts.” While the power is out, drivers with combustion engines have trouble filling up too, but with Powerpacks, there’s a backup plan.

In 2017, the exec said the plan is to eventually disconnect Superchargers from the power grid entirely, and in July Tesla opened its first V3 location in Las Vegas with solar and battery power.