Transmission-Distribution Interface Pilot Proposal More Than Smart Transmission-Distribution Interface Pilot Proposal Pathion

CAISO / IOU Interface Pilot Scenario PV Scenario Locate PV with pre-existing (or new PV deployment) In-front-of-the-meter PV connection – where PV is used as pure capacity resource and not for behind-the-meter peak load shaving Location where solar generation capacity is not fully consumed at time of generation on line segment (e.g. excess generation moves up line) Location where PV line host capacity is stressed Location where evening load is equal to or greater than daytime load Storage Role Increasing host capacity for new PV on line segment where PV was/is deployed Time shift excess PV generation (store locally and release to address evening ramp) Provide FR and DR services Explore IOU Backup service to local customer(s) Pathion

CAISO / IOU Pilot Interface Phase I IOU Line Balancing IOU leverages battery for Load shifting to best utilize PV generation to address demand FR/DR IOU dispatches FR/DR signaling Phase II IOU Substation Balancing Phase III IOU-wide balancing Beyond Initial Pilot Example diagram is modified version of existing PG&E DER diagram Pathion

Proposed Pilot Location Valencia Gardens, Mission District, San Francisco, CA Existing solar Add storage to increase PV host capacity, provide load shifting and grid services Already Funded! Recipient of CEC EPIC Grant for Solar+ Clean Coalition (lead), Pathion (sub) Grant support letters from PG&E and CAISO Pathion

Pilot Specific Details BEFORE Existing in-front-of-meter VNEM PV generation Store excess PV generation locally and use to address evening ramp Portion of battery dedicated to gird services Determine optimal use of storage to address multiple value add services AFTER Pathion