POWER EFFICIENCY CASE STUDY
7-Eleven
7-Eleven becomes the first retailer to implement
Green Charge Network’s GreenStationTM, with resounding success
Project Description
Green Charge Networks (GCN) has developed an energy storage
appliance called the GreenStationTM intended for the customer’s side
of the meter. The 100kW / 96kWh GreenStationTM installed at the
Queens, NY 7-­Eleven location is the first retailer that has successfully
implemented the GreenStationTM with the following value streams:
» Demand reduction by leveling peak loads. Peak summer demand
charge in NYC is around $25/kW.
» Increase of load capacity at the facility and avoiding infrastructure
upgrades altogether.
» Pilot of an integrated demand response program with the premier
utility in the country to take advantage of the rapid response.
We find that given specific value streams, including the ones described
above, the GreenStationTM has an ROI of 3-­7 years and is on par with
commercial PV for system payback. The goal of the implementation is
to build an economic, ROI-­driven distributed energy storage solution
and to enable grassroots-­driven, bottom-up, private sector adoption.
www.GreenCharge.Net
Case Study Specifications
Project name:
7-Eleven, Inc.
Location:
Flushing, New York
Project Dates:
July 2011 - Present
GreenStation Size:
100 kW / 96 kWh
Electric Utility:
Con Edison of New York
Results:
Reduced demand by 56%
during 2013 NYC summer
heat wave
24x7x365 operations
Outdoors, rugged design
Survived Hurricane Sandy
800.426.5010
Sales@GreenCharge.Net
POWER EFFICIENCY CASE STUDY
7-Eleven
Project Desription (continued)
Green Charge Networks’ GreenStationTM consists of a Lithium Ion storage
module, inverter, and a patent-­pending system controller technology.
Primary benefits include peak shaving and demand charge avoidance.
The system is tied to a network operations center where loads are
monitored and controlled in real-­time.
Innovative Integration
During the evaluation phase of the project, a distribution grid load
analysis was performed and it was determined that a service upgrade
would be required to install any additional load at the site. The historical
site load for the past 1W2 months had surpassed the site’s capacity of
48.6kW by 3.6kW. The installation of the GreenStationTM coupled with
an Intertie Protection Relay (IPR) avoided the service upgrade given the
GreenStationTM’s ability to monitor total site load and mitigate demand
spikes with energy storage. Without the GreenStationTM energy storage,
the high-­powered load, such as an EV charger, would have necessitated
an expensive service upgrade. Furthermore, the GreenStationTM provides demand reduction for 7-­Eleven. During the week of July 15th,
2013, when New York City experienced a summer heat wave and its distribution grid hit an all-­time peak, the GreenStationTM reduced
7-­Eleven’s peak demand by 56%. 7-­Eleven has 7,000 locations across the U.S. We have gathered enough data over a 2-­year period to prove
the economics of the product. 7-­Eleven will deploy additional GreenStationTM energy storage systems in California in 2013/2014.
Highlights of the GreenStationTM
Customer Reference
» First of its kind outdoor use with NEMA 3R enclosure
“Meeting our customers changing needs
while keeping demand charges and thus our
electricity costs in check is a very attractive
value proposition for us.”
- Tom Brennan,
Vice President of Infrastructure Services
» UL-­listed main components
» Patent-­pending controller technology for charge and discharge every
second to offset peaks & reduce demand
» Proven performance; installed and operational in New York City;
survived Hurricane Sandy
» Complimentary to PV Solar and EV charging
Technology
The GreenStationTM actively minimizes monthly peak demand usage as
measured by the utility meter. Historical and real-­time data are stored
into a cloud based network operation center. As the GreenStationTM learns the site-­specific load profile characteristics, the patent-­pending
predictive algorithm adjusts the second-­by-­second charge / discharge profile to minimize demand charges. This technology was funded by
a Smart Grid development program with the Department of Energy and Con Edison of New York. Since the first installation, GCN’s software
technology has increased three-­fold in system efficacy and reduced hardware footprint by 2/3.
www.GreenCharge.Net
800.426.5010
Sales@GreenCharge.Net