• Enter the code, or start from the link, at order time. A referral can't be applied retroactively to an order you've already placed.
• Tesla sets the terms and they change. What a referral is worth — and whether it's offered at all in your market — is decided by Tesla and varies over time, so check the current offer on Tesla's own site when you buy.
• Fresh orders only. Referrals generally apply to new vehicle purchases, not used inventory or after delivery.

I write about running a Tesla at home — off-peak charging, solar offset and real costs — over on the blog.