Late last month, the Topaz Solar project achieved full commercial operation with the completion of its final 40-megawatt (AC) phase. This is the first 500-megawatt plus solar farm to come on-line in the U.S. and the largest solar plant on-line in the world.

Two years ago, the millionth First Solar (FSLR) solar module was installed at the power plant owned by MidAmerican Solar. As of today, the project has installed 9 million solar panels across 9.5 square miles in San Luis Obispo County on California's Carrizo Plain. Construction began in 2012 and was expected to be complete in early 2015 -- so call this an on-time delivery.