PowerLight’s Solar Electric System Delivers Clean, Reliable Energy to Sonoma
County Winemaker

source: press release 2004.8.10

SANTA ROSA, CA, AUG. 10, 2004 — Bay Area policymakers joined today with St.
Francis Winery & Vineyard and PowerLight Corporation in dedicating St. Francis
Winery’s new solar array. This 457 kilowatt solar electrical system is one
of the largest solar installations in the Wine Country — and in the nation.
Covering 80,000 square feet, this solar array produces the equivalent
electricity during the day to power over 450 homes, and generates over 40% of the
winery’s energy needs. The installation was completed in June 2004.

“For three decades, St. Francis Winery has achieved great success amidst the
natural wonder of Sonoma County. By harnessing the sun’s energy to generate
electricity, we’re doing our part to protect the beauty of this magnificent
region,” said Christopher W. Silva, President & CEO of St. Francis Winery. Mr.
Silva, a fifth generation native of Sonoma County, continued, “Solar
electricity is affordable and practical, not only for winemakers, but for all businesses
and organizations that want to reduce costs and help stabilize our region’s
power supply. We hope that other businesses will follow our lead and be
inspired to preserve the environmental quality of Sonoma now, and for generations to
come.”

“St. Francis Winery demonstrates with this project that businesses can
achieve solid economic returns and environmental preservation,” said PowerLight
President Dan Shugar. “By adopting clean, reliable, sustainable power, St.
Francis is furthering its reputation as one of the nation’s most progressive
winemakers. The solar electric system will enable St. Francis to generate power from
the sun, and feed any excess power back to the utility grid, especially on
sunny days during times of peak demand. Combining solar power and energy
efficiency has enabled St. Francis to offset peak power costs statewide, benefiting
all of California’s utility customers.”

“This should be one of our nation’s highest priorities,” said Congressman
Mike Thompson. “Affordable, reliable renewable energy is critical for our long
term economic and energy security as well for the health of our environment.”

“St. Francis’ new solar installation is a model for businesses throughout
the state – and the nation,” said CA Assembly member Patricia Wiggins

“This project exemplifies the measures all business owners can embrace to
bring down their utility bills and conduct business in a sustainable manner,”
added Santa Rosa Mayor Sharon Wright.

The St. Francis Winery solar electric project is on track to receive a rebate
from Pacific Gas and Electric Company's self-generation incentive program,
which provides incentives for clean, on-site generation.

The 457 kW PowerLight solar electric system consists of high efficiency solar
modules incorporating photovoltaic cells from both Sharp Electric Corporation
and SANYO. PowerLight employed two Xantrex DC-AC converters, which deliver
power directly to the facility’s electrical system. In addition to generating
power, the solar electric system spares the environment from thousands of tons
of harmful emissions such as CO2, NOx, SOx, which are major contributors to
smog, acid rain and global warming.

St. Francis also invested in lighting upgrades to maximize energy efficiency
and minimize environmental impact. PowerLight custom designed hi-bay lighting
for both the refrigerated barrel storage and winemaking operations area. The
new lighting reduces the lighting electric demand by 48%, and generates less
heat to help maintain a cool temperature for wine storage. In addition, the high
efficiency lighting more closely matches natural lighting, increasing visual
acuity while presenting a more comfortable work environment.

About St. Francis Winery
St. Francis Winery & Vineyards (www.stfranciswine.com) was founded in 1971,
when Joe Martin purchased 100 acres of land in the historic town of Kenwood in
Sonoma Valley. Completed in 1979, the Winery was christened St. Francis Winery
after Saint Francis of Assisi, patron saint of humanitarian efforts and to
acknowledge the Franciscan order, the first to bring European grape cultivation
to the new world. In 1983 Tom Mackey was brought on board as the first full
time winemaker. Mr. Mackey added Cabernet Sauvignon and Zinfandel to the
Merlot already in production. Today, St. Francis is known as one the country's
premier high end producers of robust, flavorful wines.

About PowerLight
PowerLight (www.powerlight.com) is the leading manufacturer of
commercial-scale solar electric products and energy efficiency services. Founded in 1991,
PowerLight's systems solutions deliver reliable, affordable clean power for
commercial and government customers worldwide. Inc. Magazine ranked the PowerLight
Corporation among the top 500 fastest growing privately held companies for
the past four years. Today, PowerLight has worldwide offices and a full line of
commercial solar electric products and services.