
Tesla is now offering eligible owners the opportunity to upgrade from P90DL to P100D, albeit 14 months after originally announced.
Tesla owners are used to having to wait. The automaker generally fulfills all of its promises, it just takes time. Now, those who own, or have ordered, a P90D with Ludicrous can opt to upgrade to 100 kWh battery pack. If they've not yet taken delivery, it will cost a mere $10,000. However, it will cost a whopping $20,000 for owners that already have their vehicles. This is due to the fact that they will be returning a used battery pack, which will need to be recycled.

Way back in August of 2016, upon the announcement of the P100D, Tesla mentioned this as an option. Tesla explained:
"Tesla customers who have ordered a P90D Ludicrous, but not taken delivery, can upgrade to the 100 kWh pack for $10,000. Existing P90D Ludicrous owners can also upgrade to a 100 kWh pack, but for $20,000, as their used 90 kWh pack will have to be recycled."
However, though this has been theoretically available, the process has just started happening. Teslarati received information via Tech_Guy on the Tesla Motors Club forum, who's actually one of the first people to partake in the upgrade offer. As proof, he posted a picture of the work order for the upgrade showing his $2,500 deposit and details related to the service.
Keep in mind that this is only available on select vehicles. Tesla makes hardware changes on a regular basis, which may or may not allow for certain vehicles to be eligible. The upgrade is specific to Model S and X P90DL vehicles with the new front fascia, along with air suspension, and a current battery pack that has the compatible connectors.
If you are eligible for the upgrade and choose to follow through with the service, you also get Ludicrous Plus and new premium seats as sort of a bonus. Heck, for $20,000 we'll take all the bonuses we can get and a P100D hat would be nice, too!
Source: Teslarati