Can you use the same rune to pay both the energy cost (by exhausting it) and the calm rune cost (by recycling it) for a card like Defy?

Ruling: Yes, you can exhaust a rune for energy and also recycle that same rune to pay for a calm rune cost.

Nuances:

• Recycling a rune does not require it to be active (unexhausted)
• A single rune can fulfill both the energy payment and the rune type requirement through exhausting and recycling