Solar-panel producer Yingli Green Energy Holding (YGE.NYSE) attempted to reassure investors on Wednesday that it would be able to repay its debt on schedule after the firm issued a going-concern warning after its shares had fallen 44.7% to date in the week, The Wall Street Journal reported. Yingli said it had repaid some midterm notes that matured on May 3 and that it should be able to meet its other repayment obligations on time. Like many Chinese solar-panel producers, Yingli expanded quickly and is now weighed down by debt after suffering for years, harangued by a supply-demand imbalance as demand slackened in markets like Europe due to a weakened economy.