We added tiers to LEED v4.1 and draft v5. Initially we made 5 tiers to v4.1 for levels of RECs, green power purchases, on-site vs off-site. We heard those were too cumbersome so we went back to 3 Tiers but the hope was to push more construction of new renewables so we give more credit towards these RECs than legacy RECs.
Tier 2: New off-site renewable energy
o Off-site renewable electricity that is produced by a generation asset(s) built within the last five years or contracted to be operational within two years of building occupancy.
o Green-e Energy certification or equivalent is required for one-time purchase and delivery of EACs of more than 100% of the project’s annual electricity use.