Table 1. Summary of goal & scope definition

Item	Information
Goal and scope	To evaluate the marginal abatement cost (MAC) of alternative electricity procurement strategies (F1 & F2) for public wastewater reuse systems under increasing PPA penetration.
Studied system	WWTP coupled with MBR + UF/RO Reuse-water system (22,000m3/day)
Studied scenarios	PPA penetration (0–80%); Operation mode (F1: WWTP-coupled, F2: VRE-following); Total scenarios (n = 9)
Functional unit	1 m3 of reuse water
Location	Jeju
System boundary	Cradle-to-Gate (operational phase)
Temporal resolution	Hourly (8,760 hr)
PPA contact price	186.7(KRW/kWh)
Assessment methods	GHG emission intensity (CO2/m3), Water unit cost (KRW/m3)