Vermont Solar Development Pathways Fifth Stakeholder Meeting December 16th, 2015 Middlebury, VT

Today’s Agenda 1)Welcome, Introductions9:00 – 9:15 Christine Donovan, Moderator 2)Priority Analyses 9:15 – 10:30 David Hill, Principle Investigator 3)Break10:30 – 10:45 4)GMP’s Solar Map10:45 – 11:45 Kim Jones and Dan Belarmino 5)Next Steps and Adjourn11:45 – 12:00 Christine Donovan, Moderator

Vermont Solar Development Pathways Priority Analyses

Distribution Circuits and Capacity: Capacity transparency and NEM interconnection processes What metrics are used to establish capacity limits and reliability? How are they used and/or shared with users? How is available capacity reflected application process? How is an incremental cost of expanding capacity estimated? Do customers have the option to address capacity constraints or reliability issues? –Strategic locations –Advanced inverter capabilities –Storage –Load shaping services Green Mountain Power 2015 Solar Map

1.How do utilities differ in how they estimate and apply capacity limits? Are there cases where cap isn’t met but specific applications raise a problem? Are types of feeders differentiated by type, management priorities, etc.? Are circuits differentiated by location, proximate substations, voltage, system stiffness, etc.? 2.What tool do utilities use to support their capacity limits analysis? Would a case study be useful to test the validity of tools be useful? Photo by Patrick Finnegan. South Prairie Substation, LV side. Distribution Circuits and Capacity: Capacity transparency and NEM interconnection processes

Demand Response and Storage Customer end user 1.Demand Response (appliances, home energy systems, etc.) 2.Storage (electrochemical – e.g. Powerwall) Distribution circuit – smart inverters Substation level – grid scale storage Utility level 1.Weather forecasting (e.g. Deep Thunder) 2.Rate structuring 3.Advanced metering infrastructure (AMI) 4.Systems communication (e.g. OpenADR, SEP 1.1 & 2.0) ISO level 1.DERPs – CA – Distributed Energy Resource Providers Tesla Motors. A Computer Generated Image of the Tesla Powerwall. Digital image. Wikipedia. N.p., 1 May Web. 8 Dec Poffenberger, Aaron. Smart Meter. Digital image. Flickr. N.p., 5 Nov Web. 8 Dec Luzier, Margaret. The Seneca Pumped Storage Generating Station reservoir. Digital image. Wikipedia. N.p., 18 Oct Web. 8 Dec

Demand Response and Storage Classification Distributed Energy Resources (DERs) Generation Demand Response Dispatchable Non- Dispatchable Storage Dispatchable Non- Dispatchable

Demand Response and Storage Discussion

GMP Solar Map Project by:

Challenges in DG Siting

Objective and Goals Transparent DR Interconnection in GMP’s electrical distribution system by making the technical grid information available to developers  The Project will:  Enable optimal siting of DR while reducing interconnection cost and project lead time  Improve GMP’s efficiency and accuracy on DR interconnection analysis

Solar Map

Automated DR Screening

Automated DR Screening and Solar Map  Visual display of all GMP distribution circuits with table showing pertinent grid information, necessary for evaluation of interconnection.  Complete Capacity load flow analysis for each protective zone in a circuit; screening specific locations to assist developers in determining the maximum generation that can be added for potential interconnection.

Other Potential Benefits  GMP Planning and Operations  Identify circuits/areas with infrastructure constraints (i.e. interconnection capacity)  Infrastructure upgrade deferral  Microgrid implementation  Quantify the benefits of Distributed Energy Resources

Vermont Solar Development Pathways Next Steps

Finalize scope of priority analyses Research and analysis in small teams Presentation of results at next large meeting in late March

For More Information General questions on project Objectives, scope, timing and scenario modeling David Hill: Damon Lane: Focus area logistics, issues or topics Focus Area Leads Suzanne Elowson: Carl Linvill: David Roberts: Ingrid Malmgren: Peter Schneider: Jake Marin: Li Ling Young: Ethan Goldman: Nick Lange:

Thank You!

Shawn Enterline, GMP

Vermont Demand Net of Solar