Free HOT / Metro ExpressLane access for EVs is going away 1 March. They will get a 15% discount.
From Metro Express Lanes:
Starting March 1, 2019:
• Customers with a clean air vehicle (CAV) displaying a valid DMV-issued red or purple CAV decal with a copy of their vehicle’s official California DMV vehicle registration provided to Metro ExpressLanes, are eligible for a 15% discount off of the posted rate on the I-10 and I-110 Metro ExpressLanes.