Niagara Falls, New York. Original image from Carol M. Highsmith’s America, Library of Congress collection. Digitally… https://www.rawpixel.com/image/421751/free-photo-image-nature-background-niagara-falls-carol-highsmith-waterfallFree Image from public domain licensePacific Northwest National Laboratory (PNNL) is supporting the design of new hydropower systems that minimize or avoid… https://www.rawpixel.com/image/3322375/free-photo-image-autonomous-sensor-devise-bio-acoustics-cc0Free Image from public domain license The hydropower plant above the Oahe Dam, which creates Lake Oahe, the fourth-largest man-made… https://www.rawpixel.com/image/8041749/photo-image-plant-man-public-domainFree Image from public domain license