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I transferred the solar token from the earlier iteration of this reward program (when it was for the 2nd referral) and now have another one from my 5th referral that I would imagine could also be transferred.
That was my thread talking about the Powerwall 2 awards. As MH mentioned above, for the solar tokens, the rules specifically say they are transferable. They really don't have any intrinsic value, they're just "go to the head of the line" cards.
Thanks for setting me straight. I wish this @#$ forum let users edit or delete posts. It's the only forum I've ever been on in 23 years of online life that denies this ability. I guess they like bad and wrong info to stick around and mislead people in perpetuity.