Principal Solar, Inc. announced that eTruck Transportation (“eTruck”) is on schedule with the development and planned availability of its class 6 hybrid heavy electric vehicle demonstration vehicles, both of which are planned for the fourth quarter of 2021. eTruck's heavy vehicle EV conversion technology is engineered to enable transportation and logistics companies of all sizes to cost-effectively transition their existing fleets from diesel to high performance hybrid electric fleets without waiting for major truck manufacturers to engineer completely new platforms. eTruck’s proprietary system lowers operational costs, reduces fuel consumption and emissions, thus enabling diesel fleets to transition towards electric power, without sacrificing performance, range, or utility.