Despite a wealth of positive news hitting Wall Street today on the solar sector, the Claymore/MAC Global Solar Energy Index (TAN: sentiment, chart, options) exchange-traded fund (ETF) is off about 1.5% heading into the final hour of trading. In case you missed it, LDK Solar (LDK) was the target of some heavy call activity in recent days, while China Sunergy (CSUN) was upgraded to "buy" from "hold" at Jefferies & Co.

In other news around the solar sector, Trina Solar (TSL: sentiment, chart, options) announced that it has signed an agreement to buy more polysilicon for solar modules. The deal is a supplemental agreement to a long-term polysilicon supply agreement with GCL Silicon Technology Holdings. TSL shares are up about 3% on the report, breaking through an area of resistance I had previously noted in the 32-33 region. The equity is now staring up at its 20-week moving average in the 36 area, giving TSL some room to run higher over the short-term.

Elsewhere, shares of Suntech Power Holdings (STP: sentiment, chart, options) are off more than 2% after HSBC boosted its price target for the stock to $55 per share from $46 per share. The brokerage firm kept its "overweight" rating on the equity. Today's news follows on the heels of a wealth of positive analyst comments stemming from the company's recent second-quarter earnings report. The shares have bested their 20-month moving average, a trendline I was watching for technical troubles, but a short-term hurdle has emerged at the 47 level. With sentiment at extreme bullish levels, today's sell-off on the price-target increase could indicate that buying pressure is beginning to wane on STP.