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

2. 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

3. 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

4. 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

5. 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