We have not yet seen internal electric failures occurring in Clearvue prototypes or products under their expected normal operating conditions. The fault probability is reduced (compared to the conventional stand-alone silicon PV panels mounted on roofs), due to the careful design of internal electric circuitries and the fact that per unit module area, less power is generated. It can hardly be expected that any semitransparent windows would generate the amounts of power similar to silicon PV, regardless of BIPV technology selected. The wide range of stringent environmental conditions to which ClearVue windows were exposed during UL certification testing (prolonged exposure to dry heat, damp and heat, water immersion, etc) confirms their reliability. At the circuit level (building installations involving groups of windows wired together), again, we pay special attention to the electric circuit design features preventing the faults, and also mitigating their effects. In the unlikely future cases of failures, there will be either no stringent need to replace 1 window out of hundreds/thousands, or the options accessible to bypass the window electrically without replacing it as a structural unit. Most likely failure points are outside of the window and accessible.