The Department of Energy (DOE) seeks input from the public related to improving the manufacturing process for both marine and hydrokinetic (MHK) and hydropower technologies. An emphasis on design for manufacturing could transition a nascent MHK industry from its current focus on performance prototypes towards manufacturing cost competitive production units. Advanced materials and manufacturing processes for hydropower turbines could result in cost reduction across the entire power plant that will have significant impact on the levelized cost of energy (LCOE) of hydropower. Investment in materials and manufacturing will drive an increase of U.S. domestic manufacturing content in clean energy technologies. DOE is seeking to improve these areas and is requesting information to identify the most promising investment opportunities based on industry needs. The information collected by this RFI will be used for market baseline information and internal DOE planning. Interested parties to this RFI may include, but are not limited to MHK and hydropower: Developers (Technology and Project); Original Equipment Manufacturers (OEMs); State agencies; Research institutions; Manufacturers; and Suppliers. The full Request for Information (RFI) is posted on the EERE Exchange website at https://eere-exchange.energy.gov. Information on where to submit questions regarding the content of the RFI and where to submit questions regarding the EERE Exchange system can also be found on the EERE Exchange website.