"Discrete emission reduction (DER)" means "discrete emission reduction (DER)" as defined in the US EPA's proposed Model Open Market Trading Rule (60 FR 39668, August 3, 1995), namely, "an emission reduction generated over a discrete period of time, and measured in weight (e.g., tons)."
N.H. Admin. Code § Env-A 3102.13
#6441, EXEMPT, eff 1-21-97