a concentrating solar energy device for use in buildings is configured to share structural elements with a building for cost savings . the device incorporates a shallow cylindrical trough mirror comprising mirrored sheets that are conformed to curved rafters , a receiver that is moveable within the cumulative area of focus of the cylindrical trough mirror , a secondary mirror integrated with the receiver that augments solar energy collection , and parallel linear tracking assemblies that move the receiver and that mount to a building &# 39 ; s side walls .