PALO ALTO (AP) — An increasing number of electric-vehicle driving employees at Silicon Valley companies are finding it hard to access car-charging stations at work, creating incidents of "charge rage" among drivers. Installation of electric vehicle charging ports at some companies has not kept pace with soaring demand, creating thorny etiquette issues in the workplace, the San Jose Mercury News. Peter Graf, chief sustainability officer for German software company SAP, says the company's 16 charging stations are now not nearly enough for the 61 employees who drive electric vehicles.