This week, these four stocks have the worst ratings in Cash Flow, one of the eight Fundamental Categories on Portfolio Grader.

LDK Solar (NYSE:LDK) manufactures multicrystalline solar wafers. LDK gets F’s in Earnings Growth, Earnings Momentum, Analyst Earnings Revisions, Equity, Operating Margin Growth, and Sales Growth as well. The price of LDK is down 79.8% since the first of the year. This is worse than the S&P 500, which has seen a 12.3% increase over the same period. For more information, get Portfolio Grader’s complete analysis of LDK stock.

Suntech Power Holdings (NYSE:STP) is a solar energy company that designs, develops, manufactures and markets PV cells and molecules. STP gets F’s in Earnings Growth, Analyst Earnings Revisions, Equity, Operating Margin Growth, and Sales Growth as well. Shares of the company have declined 63.8% since the first of the year. For more information, get Portfolio Grader’s complete analysis of STP stock.

Empresa Distribuidora y Comercializadora Norte

(NYSE:EDN) distributes and sells electricity in the north-eastern region of greater Buenos Aires. EDN gets F’s in Earnings Momentum and Equity as well. Since January 1, the price of EDN has declined 63.9%. For more information, get Portfolio Grader’s complete analysis of EDN stock.

Hanwha SolarOne (NASDAQ:HSOL) manufactures photovoltaic (PV) cells and modules, provides PV cell processing services to convert silicon wafers into PV cells, and supplies solar system integration services in China. HSOL also gets F’s in Earnings Growth, Earnings Momentum, Analyst Earnings Revisions, Equity, Operating Margin Growth, and Sales Growth. For more information, get Portfolio Grader’s complete analysis of HSOL stock.

Louis Navellier’s proprietary Portfolio Grader stock ranking system assesses roughly 5,000 companies every week based on a number of fundamental and quantitative measures. Stocks are given a letter grade based on their results — with A being “strong buy,” and F being “strong sell.” Explore the tool here.