Still, the utility-scale solar market continues to be substantially larger than home installs. Currently, there are 729 megawatts worth of solar panels installed in solar farms that feed into the grid, compared with 473 megawatts of solar panels installed on home roof tops. Solar farms are still growing rapidly, too. Many are racing against time to add new installations and take advantage of the federal investment tax credit, which offers a 30 percent tax credit. The credit should drop down to 10 percent in 2017, so solar farms want to make the most of the subsidy while it’s still at the higher amount.