groSolar: Mustang Solar (South and North Sites)

Mustang Solar is a 3 MWdc solar project developed, designed and constructed by groSolar for the Oklahoma Gas & Electric (OG&E) utility. groSolar is a large commercial- and utility-scale solar development, engineering, procurement and construction firm with more than 15 years of experience. Since inception, the company has built more than 2,000 solar projects for a wide variety of customers, including government, commercial, industrial and utility entities.

Mustang Solar comprises two sites (Mustang South and Mustang North) and deploys both tracked and fixed arrays. groSolar engineers utilized NEXTracker distributed tracking technology on the North site to achieve the project’s desired electrical production on a small parcel of undeveloped land adjacent to OG&E’s Mustang Station, an existing natural gas–fueled power plant. The designers created the Mustang Solar project as a test bed of solar technology for OG&E, while it also provides significant power to the utility’s customers—the project generates enough electricity to power approximately 500 homes.

The Mustang North array has 144 rows of self-powered single-axis trackers with 54 PV modules per tracker. Each tracker has a rotational range of ±60 degrees. Two central controllers communicate with all rows and four weather stations via mesh network, which allows the utility SCADA system to monitor and control the trackers. groSolar included training for OG&E personnel on this first OG&E-owned and -operated single-axis tracker PV project.

The groSolar engineering and construction teams carefully managed the project schedule and partner collaboration to deliver this successful project to OG&E. The energization of the Mustang Solar PV plant represents one of the most significant solar developments in Oklahoma to date and is part of OG&E’s continued commitment to being an affordable, reliable, safe and environmentally responsible energy provider.

“groSolar is proud to be a part of bringing solar to Oklahoma with our partners at Oklahoma Gas & Electric. We’ve built projects all over the nation, and Oklahoma stands out as a state with some of the best solar resources we’ve seen. It has enormous solar generation potential.”

—Jamie Resor, CEO, groSolar 

Overview

DESIGN AND INSTALLATION FIRM: groSolar, grosolar.com

ENERGIZATION DATE: May 2015 (Mustang South), August 2015 (Mustang North)

INSTALLATION TIME FRAME: 68 days (Mustang South), 116 days (Mustang North)

LOCATION: West Oklahoma City, OK, 35.5°N, 97.7°W

SOLAR RESOURCE: 5.4 kWh/m2/day

ASHRAE DESIGN TEMPS: 96.8°F 2% average high, 6.8°F extreme minimum

ARRAY CAPACITY: 3 MWdc

ANNUAL AC PRODUCTION: 5,500 MWh

Equipment Specifications

MODULES, MUSTANG SOUTH: 2,091 Trina Solar TSM-PD14, 310 W STC, +3/-0%, 37 Vmp, 8.38 Imp, 45.5 Voc, 8.85 Isc

INVERTERS, MUSTANG SOUTH: 18 Yaskawa–Solectria Solar PVI 28TL, 28 kW, 1,000 Vdc maximum input, 500–800 Vdc MPPT range, 3-phase 480 Vac output; inverter outputs collected in 480 Vac panelboards and switchboards; collected output stepped up to 12.47/7.2 kV and connected to an OG&E distribution feeder

ARRAY, MUSTANG SOUTH: 17 modules per source circuit (5,270 W, 629 Vmp, 8.38 Imp, 773.5 Voc, 8.85 Isc), six or seven source circuits per inverter, 648 kW array total

ARRAY INSTALLATION, MUSTANG SOUTH: Fixed ground-mount, Solar FlexRack racking, 195° azimuth, 25° tilt, tables spaced for 10am–2pm winter solstice solar window

MODULES, MUSTANG NORTH: 7,776 Trina Solar TSM-PD14, 305 W STC, +3/-0%, 36.6 Vmp, 8.33 Imp, 45.45 Voc, 8.81 Isc

INVERTERS, MUSTANG NORTH: 72 Yaskawa–Solectria Solar PVI 28TL, 28 kW, 1,000 Vdc maximum input, 500–800 Vdc MPPT range, 3-phase 480 Vac output; inverter outputs collected in 480 Vac panelboards and switchboards; collected output stepped up to 12.47/7.2 kV and connected to an OG&E distribution feeder

ARRAY, MUSTANG NORTH: 18 modules per source circuit (5,490 W, 658.8 Vmp, 8.33 Imp, 818.1 Voc, 8.81 Isc), three source circuits per tracker (16.47 kW, 658.8 Vmp, 24.99 Imp, 818.1 Voc, 26.43 Isc), six source circuits per inverter (32.94 kW, 658.8 Vmp, 49.98 Imp, 818.1 Voc, 52.86 Isc), 2,372 kW array total

ARRAY INSTALLATION, MUSTANG NORTH: Tracked array, 144 NEXTracker SPT horizontal axis trackers, ±60° tracking rotation range

SYSTEM MONITORING: AlsoEnergy DAS systems provide performance monitoring and manage remote monitoring and control via an OG&E SCADA system

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