When the Costco managers at the headquarters in Issaquah, Wash., decided it was time to embrace solar photovoltaic technology, they selected the Costco warehouse in Lancaster - from among their 480 warehouses worldwide - for the prototype project. At the completion of the project the last week of August, the Lancaster facility will be the site of one of the largest privately owned commercial photovoltaic systems in the United States, said the builders. According to Craig Peal, assistant vice president, when powered up, the system will reduce 44% of the building's peak electrical load on a peak day and "if...