President Obama’s Alma Mater Occidental College is finishing up work on a $6.8 million, 1-megawatt ground-mounted solar array. When finished this spring it will be one of the largest ground-mounted arrays in Los Angeles, generating about 11 percent of the College’s annual electrical usage. Led by physics professor Daniel Snowden-Ifft, the array’s 4,886 panels will be mounted on top of shade structures in a campus parking lot and on a nearby hillside.