California State University at Hayward

Cal State Hayward Goes Solar with SunPower

BACKGROUND
Established in 1957, Cal State Hayward is a comprehensive university with a wide range of disciplines being taught to more than 13,000 students each semester. With two beautiful, easy-to-reach campuses in the heart of the San Francisco East Bay Area,California State University, Hayward is one of the 23 campuses in the California State University system.

CHALLENGE
Earlier this decade, Cal State Hayward embarked on a major effort to modernize its campus and bring down utility costs. Cal State Hayward made a strong commitment to renewable power and sustainable building practices. In March 2003, the Board ofTrustees and University Administrators decided that Cal State Hayward should generate its own power, so that the school would be able to address its energy needs more reliably,especially during the summer months when electricity prices are the highest and the grid is constrained.

SOLUTION
Faced with the challenges of rising utility costs, Cal State University decided to installan ambitious solar electric system at its Hayward campus. The 1.01 megawatt solar electric system leverages the area’s abundant sunlight and generates enough powerduring the daytime to power 1,000 homes. At the time of its completion in March 2004, Cal State Hayward’s solar electric system was the largest solar electrical system at any university in the nation—sited in California, a state that is making renewable energy deployment a top priority.

Covering over 75,000 square feet, Cal State’s solar electric system is installed on four of the university’s largest buildings and delivers 30 percent of the campus’ peak electricity demands. The photovoltaic system reduces the university’s annual electricity billby $200,000, and contribute to the region’s overall environmental health. By generating solar power, Cal State Hayward is effectively reducing its purchases of expensive peak electricity and doing its part to address California’s ongoing energy challenge.

PHOTOVOLTAIC (PV) SYSTEM DESCRIPTION
The solar electric system installed at Cal State Hayward uses SunPower’s PowerGuard® Roof Tile technology, a lightweight building-integrated photovoltaic (BIPV) roofing assembly that is installed over an existing roof membrane.

PowerGuard tiles fit together with interlocking tongue-and-groove side surfaces that enable the assembly to resist wind uplift without roof penetrations. In addition to generating power, SunPower’s solar roof tile provides thermal insulation to decrease building energy consumption and reduce heating and air conditioning costs.SunPower’s roofing system also extend the roof’s life by protecting the roof membrane from harsh UV rays and thermal exposure.

Project Overview

Date Completed: December 2003
System Peak Capacity: 523 kW
PV Surface Area: 40,000 sq. ft.
Solar Electric Tiles: 2,752
Products: SunPower® PowerGuard®
 
Date Completed: December 2003
System Peak Capacity: 261 kW
PV Surface Area: 20,000 sq. ft.
Solar Electric Tiles: 1,376
Products: SunPower® PowerGuard®
 
Date Completed: January 2004
System Peak Capacity: 102 kW
PV Surface Area: 8,200 sq. ft.
Solar Electric Tiles: 536
Products: SunPower® PowerGuard®
 
Date Completed: March 2004
System Peak Capacity: 114 kW
PV Surface Area: 8,200 sq. ft.
Solar Electric Tiles: 600
Products: SunPower® PowerGuard®

Benefits

  • Solar rooftop system provides thermal insulation and protects the roof from weather and UV radition
  • Reduces energy and operating costs while sparing the environment from thousands of tons of harmful emissions
  • Will reduce CO2 emissions by 8,900 tons over 30 years, which his equivalent to planting almost 2,500 acres of trees or removing 1,800 cars from California’s roadways

California State University at Hayward
Physical Education Building
December 2003

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“ We’re thrilled that solar power is being deployed at Cal State Hayward.With this solar electric installation, Cal State Hayward will have a costeffective, reliable, non-polluting system that will significantly reduce our electricity bill and contribute to the region’s overall enviromental health.We hope to set an example for the entire Cal State University system, as well as other universities across the country. ”
– Norma S. Rees,
President,
California State University, Hayward

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