Development agency Scottish Enterprise is inviting bids for the cash under the Waters 2 programme to help testing of wave and tidal-energy systems.
The first round of Waters funding included support for marine energy innovators such as Aquamarine Power, Open Hydro and AWS Ocean Energy.
The initiative aims to speed the deployment of commercially-viable marine renewables technologies in Scottish waters.
"Priority will be given to applications that support viable projects enabling full-scale proving of devices that have already been tested at part-scale, but smaller demonstration projects will also be considered," says a statement.
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