More Than Smart
Transmission-Distribution Interface Pilot Proposal
Pathion
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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)
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CAISO / IOU Pilot Interface Phase I
• 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
Beyond Initial Pilot
• Phase II
• IOU Substation Balancing
• Phase III
• IOU-wide balancing
Example diagram is modified version of existing PG&E DER diagram
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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
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BEFORE
Pilot Specific Details
• 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
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