MIT Engineers Connect Solar Panels Directly to An Electrodialysis System, Eliminate Batteries, Adjust Current and Flow 3 to 5 Times Per Second, Capture Over 94% of Generated Energy, and Achieve Up to 5,000 Liters of Water Per Day in Real Tests for 6 Months in New Mexico

Written by Noel Budeguer

Published on 16/02/2026 at 12:10

Updated on 16/02/2026 at 12:11

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While Traditional Plants Require Heavy Infrastructure, An MIT Prototype Focuses on Simplicity: Direct Connection to the Solar Panel, Dynamic Control 3–5 Hz, Average Efficiency Above 94%, and Validation in Alamogordo, Indicating a More Feasible Path for Off-Grid Potable Water

A team from the Massachusetts Institute of Technology (MIT) has developed a desalination system powered directly by solar panels that completely eliminates the need for batteries — even when sunlight varies throughout the day.

The advancement, announced on October 8, 2024, by MIT News, could represent an important step in bringing potable water to arid regions and isolated communities without reliable access to the electrical grid.

How The Technology Works

The system uses electrodialysis, a method that removes salt from water through an electric field applied to selective ion membranes.

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The core innovation lies in a control mechanism called “flow-commanded current control”, which automatically adjusts:

The electric current applied to the membranes
The water flow in the system

This adjustment happens 3 to 5 times per second, allowing the equipment to respond almost instantaneously to passing clouds or fluctuations in solar intensity.

Instead of storing energy in batteries, the system adapts its operation in real time, utilizing nearly all available electricity.

In a direct-drive electrodialysis desalination system, using flow-commanded current control, solar panels capture energy from the sun and optimize it (shown in yellow) for the pump and the electrodialysis unit, without the need for energy storage, like batteries. The saline feedwater flows through the pump to the electrodialysis module, where it is desalinated and separated into a flow of potable water (light blue) and a flow of concentrated brine (dark blue).

Efficiency Above 94% in Real Tests

During field tests conducted for six months at the Brackish Groundwater National Desalination Research Facility (BGNDRF) in New Mexico (USA), the system demonstrated:

Utilization of over 94% of the generated solar energy
Production of up to 5,000 liters of water per day
Estimated capacity to serve around 3,000 people

The results were published in the scientific journal Nature Water, in the article titled:

“Renewable Desalination Without Energy Storage: Direct-Drive Photovoltaic Electrodialysis via Flow-Commanded Current Control”.

Who Is Behind The Project

The work was led by Amos Winter, professor of Mechanical Engineering at MIT and director of the K. Lisa Yang Global Engineering and Research (GEAR) Center, with contributions from Jonathan Bessette and Shane Pratt.

The project received support from the National Science Foundation, the Julia Burke Foundation, the MIT Morningside Academy of Design, as well as technical support from companies such as Veolia Water Technologies and Solutions and Xylem Goulds.

(From left to right): Jon Bessette, Shane Pratt, and Muriel McWhinnie (UROP) stand in front of the electrodialysis desalination system during an installation carried out in July.

Why This Matters Globally

Traditional desalination consumes large amounts of energy and often relies on complex infrastructure. By eliminating batteries and increasing the utilization of solar energy, the system reduces operational costs and simplifies installation.

In a world where over two billion people live under water stress, decentralized and renewable energy-driven solutions may become increasingly strategic.

According to MIT, the team plans to turn the technology into a company in the coming months, seeking to expand its practical application.

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MIT Engineers Connect Solar Panels Directly to An Electrodialysis System, Eliminate Batteries, Adjust Current and Flow 3 to 5 Times Per Second, Capture Over 94% of Generated Energy, and Achieve Up to 5,000 Liters of Water Per Day in Real Tests for 6 Months in New Mexico

While Traditional Plants Require Heavy Infrastructure, An MIT Prototype Focuses on Simplicity: Direct Connection to the Solar Panel, Dynamic Control 3–5 Hz, Average Efficiency Above 94%, and Validation in Alamogordo, Indicating a More Feasible Path for Off-Grid Potable Water

How The Technology Works

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MIT Engineers Connect Solar Panels Directly to An Electrodialysis System, Eliminate Batteries, Adjust Current and Flow 3 to 5 Times Per Second, Capture Over 94% of Generated Energy, and Achieve Up to 5,000 Liters of Water Per Day in Real Tests for 6 Months in New Mexico

While Traditional Plants Require Heavy Infrastructure, An MIT Prototype Focuses on Simplicity: Direct Connection to the Solar Panel, Dynamic Control 3–5 Hz, Average Efficiency Above 94%, and Validation in Alamogordo, Indicating a More Feasible Path for Off-Grid Potable Water

How The Technology Works

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