Denver Post: The nation’s severe credit crisis is dimming the appeal of a long-awaited extension for renewable-energy tax credits. After months of delays, Congress finally passed the extension Oct. 3 – just in time for the alternative-energy industry to face the full brunt of the upheaval in financial markets that has sharply reduced commercial lending. Some wind- and solar-energy projects are moving forward under the impetus of the renewed tax credits. But many others are on hold as …