Duke Energy Carolinas (DEC) and Duke Energy Progress (DEP) Request for Proposals for solar energy and solar plus storage projects. The RFP seeks proposals for renewable energy projects including: Solar-Only Power Purchase Agreements (PPAs), Solar-Only Use of Technology (UOT) proposals, Solar Plus Storage (SPS) PPAs, and SPS UOT proposals. Projects must meet interconnection requirements with DEC and DEP generation resources. The procurement includes technical specifications for battery energy storage systems (BESS), interconnection requirements, project development guidance for asset transfers and build-own-transfer models, survey requirements, pollinator habitat standards, and approved vendor lists. Proposals must include detailed financial terms, energy production modeling using PVSyst, interconnection cost estimates, and compliance with diverse business requirements.