Scientists have invented a new glass coating for omnidirectional solar panels - ScienceAlert Glass coating lets solar panels absorb light from multiple angles, clean themselves : TreeHugger This is pretty nifty, a way to boost cell efficiency by 5.2% to 27.7%. It sounds like this could boost SolarCity's 22% efficiency panels to 27%. And this could be particularly useful for rooftop installation were the roof angles are less than ideal. Hopefully, a glass coating would not be too expensive to produce or apply. To put this into perspective, SunPower and other panels makers are striving to add 0.5% each year. So this coating could be a 10-year leap forward in technology. This is about a 23% gain in panel output.