On August 22, 2019, California interconnection Rule 21 Phase 2, and parts of Phase 3, become effective. At that time, most new residential and commercial Distributed Energy Resource (DER) systems comprised of PV only or PV + storage, must be ready to communicate to the host utility using a protocol called Institute of Electrical and Electronics Engineers Standard (IEEE Std.) 2030.5-2018. This protocol includes the requirement for Transport-Level Security (TLS) and strong encryption.
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