Arizona Republic: Solar- and wind-energy projects in Arizona and around the country continue to hang in limbo after Congress adjourned for its summer recess without reaching agreement on legislation that would extend renewable-energy tax credits. The subsidies are considered critical for projects like the Solana Generating Station, a $1 billion, 280-megawatt plant slated for construction near Gila Bend. But extending the tax credits beyond their Dec. 31 expiration date is proving to be a difficult, if …