Resilient Microgrids and Back-up

Power by Pairing Solar With Storage Behind the Meter.

Overview – MD Konterra Solar Project, BTM Microgrid

July 29, 2014

Confidential and Proprietary.Do not redistribute without permission of Solar

Grid Storage LLC

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Drivers for Solar + Storage Consumers are increasingly demanding

emergency backup for power outages Increased penetration of intermittent solar power

and other RE causes utility grid operators to search for additional power balancing technologies

Fierce competition in the solar and RE industries drives companies to find ways to lower costs and provide additional benefits

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Financed Storage = Cost Reduction, Emergency Power, Grid Stability

Making Solar Better

Solar Grid Storage - background Solar Grid Storage is at the forefront of delivering affordable energy storage for

commercial solar installations, government entities, and electric utilities

We build, finance, and operate energy storage systems (PowerFactor™)

A complete PowerFactor™ system including inverter and battery is installed alongside solar energy systems

Solar Grid Storage finances the PowerFactor™ systems separately from the PV system Solar Grid Storage maintains and operates the PowerFactor™ systems for 10 years Revenues from grid ancillary services provide the revenues for financing allowing Solar Grid

Storage to offer “inverter services” to the PV customer at lower cost than buying an inverter

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Confidential and Proprietary. Do not redistribute without permission of Solar Grid Storage LLC

Making solar better

Project Background - MD Game Changer State of MD – MEA was looking for “game changing”

technologies to help solar – State provided grant funds of $250k

Solar Grid Storage works with solar developers – Standard Solar

Customer was interested in the backup power aspect of offering

Confidential and Proprietary.

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Konterra – Real Estate Developer HQ Local commercial/mixed use real estate developer in Laurel MD

Multi-story office building Carport canopy PV from SolAire 400kW Two PowerFactor 250’s from Solar Grid Storage (500kW ac capacity) 300kWh battery from AllCell (L-ion air cooled) Communications

AGC via NOC SCADA capable

Real time metering

Confidential and Proprietary.

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Value Seen by Partners Konterra (Host)

Konterra sees value in including solar + storage for future developments they undertake Emergency backup services – lower full time capacity than 500kW on-site diesel genset but UPS quality transfer and can provide power during multi-week outage Peak Demand reduction On site Volt/VAR support

Standard Solar (developer)

New product offering Provides service grid does not Can move solar to prime power opt May break the solar “cost effective” paradigm

Confidential and Proprietary.

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Project Timeline Grant secured in March 2013 Interconnection completed May 2013 (BGE) Standard Solar PV Project construction started June 2013 PowerFactor Systems delivered to site August 2013 – ready for PV DC

connections and AC connections to grid and critical loads circuits (note: system needs AC or DC source for battery cooling)

System started producing PV power in late Sept 2013 PowerFactor system operating in PJM markets April 2014

Confidential and Proprietary.

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Project Commissioning Ribbon cutting Oct. 2013 Maryland Governor Martin O’Malley and FERC Chairman Jon Wellinghoff

provided remarks – noted innovation of this new PV based microgrid with its grid support capabilities.

Press: “If you want to see the future of renewable energy in the U.S., you should check out the large container sitting next to a nondescript office building off the I-95 corridor in Maryland.” www.businessinsider.com

Confidential and Proprietary.

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Ongoing Issues Customer not familiar with idea of UPS backup power but of

limited duration SGS suggests 20% of inverter rating

Evaluating battery operations on PV production 10% RT efficiency loss on solar AC Need to move to DC PV measurement for PPA and SRECs -- Prevents gaming

Integration of on-site existing diesel genset with PV + Storage Genset is old: has no sychronization capability and cannot take operational

signals from PowerFactor system. Intend to use Genset and ATS as simple backup power source for SGS system. SGS system not qualified as “life safety” backup system. SGS system has the ability to operate a smart generator as charger.

Confidential and Proprietary.

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PowerFactor (500kW)

IEEE 1547

GenSet (500kW) No synch

TO GRID

NC auto isolate

ATS

100kW critical loads

Life Safety ~100kW

KONTERRA EXISTING SET UP

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PowerFactor (500kW)

IEEE 1547

GenSet (500kW) No synch

TO GRID

NC auto isolate ATS

UPS critical loads

Life Safety

ALTERNATIVE NS SET UP

MAIN

GenSet can charge battery No shut off

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PowerFactor (500kW)

IEEE 1547

GenSet (≥500kW) No synch

TO GRID

NC auto isolate ATS

UPS critical loads up to 400kW

Microgrid panel Up to Gen rating minus charge power

SMART SET UP PF provides site regulation

MAIN (e.g. non critical loads)

Comm line – PF controls Gen

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Thank you

Christopher Cook, President 301-637-3644;

ccook@solargridstorage.com

Solar Grid Storage LLC www.solargridstorage.com

Confidential and Proprietary. Do not redistribute without permission of Solar Grid Storage LLC

Making solar better