[HANWHA SOLARONE TO USE PHOTOWATT ONTARIO-ASSEMBLED PV MODULES FOR THE ONTARIO MARKET SHANGHAI, China, June 1, 2011 – Hanwha SolarOne Co., Ltd. ("Hanwha SolarOne" or the "Company") (NASDAQ: HSOL), a vertically integrated manufacturer of silicon ingots, wafers and photovoltaic (“PV”) cells and modules in China, today announced it has entered into a supply agreement with Photowatt Ontario, Inc. (“PWO”), a] [99.1 Press Release Dated June 1, 2011. HANWHA SOLARONE CO., LTD]

[Hanwha SolarOne Reports First Quarter 2011 Results SHANGHAI, May 24, 2011 — Hanwha SolarOne Co., Ltd. ( "SolarOne" or the "Company") (Nasdaq: HSOL), a vertically integrated manufacturer of silicon ingots, wafers and photovoltaic (“PV”) cells and modules in China, today reported its unaudited financial results for the quarter ended March 31, 2011. The Company will host a conference call to] [99.1 Press Release Dated May 24, 2011. HANWHA SOLARONE CO., LTD]

[HANWHA SOLARONE ANNOUNCES NORTH AMERICAN TEAM EXPANSION Further supports the company’s commitment to growth in the U.S. market SHANGHAI, China, May 10, 2011 – Hanwha SolarOne Co., Ltd. ("Hanwha SolarOne" or the "Company") (NASDAQ: HSOL), a vertically integrated manufacturer of silicon ingots, wafers and photovoltaic (“PV”) cells and modules in China, today announces the continued expansion of its North American] [99.1 Press Release Dated May 10, 2011. HANWHA SOLARONE CO., LTD]

[Hanwha SolarOne to Announce First Quarter 2011 Financial Results on May 24, 2011 SHANGHAI, China (May 10, 2011) Hanwha SolarOne Co., Ltd. (“Hanwha SolarOne” or the “Company”) (NASDAQ: HSOL), a vertically integrated manufacturer of silicon ingots, wafers and photovoltaic (“PV”) cells and modules in China, Conference Call Dr. Peter Xie, President and CEO, Mr. Gareth Kung, Chief Financial Officer, and] [99.1 Press Release Dated May 10, 2011. HANWHA SOLARONE CO., LTD]

[Hanwha SolarOne Reports Fourth Quarter 2010 and Full Year 2010 Results SHANGHAI, March 17, 2011 — Hanwha SolarOne Co., Ltd. ( "SolarOne" or the "Company") (Nasdaq: HSOL), a vertically integrated manufacturer of silicon ingots, wafers and photovoltaic (“PV”) cells and modules in China, today reported its unaudited financial results for the quarter ended December 31, 2010. The Company will host] [99.1 Press Release Dated March 17, 2011. HANWHA SOLARONE CO., LTD]