Maris hydro is composed of two Kaplan generator units with a nameplate capacity of 4.25 MW each. Unit 1 was commissioned on October 24, 2017 while Unit 2 was commissioned on November 6, 2017.

The Maris hydro project was proposed by SNAP-Magat's operations and maintenance team under the company's business creativity and innovation program. It was then developed and implemented by the business development group and later turned over to SNAP-Magat for operation.

Construction of the run-of-river hydro plant, located in Barangay. Ambatali in Ramon, Isabela, took about two years. The plant utilizes the water coming from Magat hydro that goes into the Maris re-regulating dam located downstream of Magat, before flowing into the Maris Main (South) Irrigation Canal.

The project was made possible with the cooperation of key stakeholders, primarily the National Irrigation Administration (NIA), Department of Energy (DOE), host communities, and local government units.

In 2017, the project was awarded the Corporate Safety Milestone Award by the Safety and Health Association of the Philippine Energy Sector, Inc. for accumulating at least one million man-hours without lost time accident.