PC Slower Than It Used to Be?
A free scan shows the junk files, broken settings and background clutter dragging Windows down - then fixes them in one click.Free scan · Windows 10 & 11Outdated Drivers Are Slowing You Down
One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware matchiTechGuides is reader-supported. When you buy through links on our site, we may earn an affiliate commission. As an Amazon Associate I earn from qualifying purchases. Learn more
Japan’s Mamizupia osmotic power facility in Fukuoka began operating in August 2025. It uses pressure-retarded osmosis to generate electricity from the salinity difference between concentrated seawater left over from desalination and treated wastewater. Its operator lists about 110 kW of planned net output and up to 880,000 kWh a year—but those are design figures, not verified production totals.
How does osmotic power work?
Osmotic power does not burn salt or extract electricity from salt by itself. It takes advantage of the difference in chemical potential between water with different salt concentrations. At Mamizupia, an osmotic membrane separates concentrated seawater from lower-salinity treated wastewater while allowing water to pass through.
Water moves through the membrane toward the more concentrated seawater. In pressure-retarded osmosis (PRO), that side is kept under pressure. The additional water flow increases the pressurized stream, which drives a turbine connected to a generator. Pumps and other equipment also use power, so the useful net output is lower than the generator’s gross output.
What water does the Fukuoka plant use?
The installation sits at the Uminonakamichi Nata Seawater Desalination Center, known as Mamizupia. The desalination process produces freshwater and a concentrated seawater discharge; the osmotic system uses that discharge alongside treated wastewater from the nearby Wajiro Water Treatment Center. The Fukuoka District Waterworks Agency lists planned daily feed volumes of about 10,000 tonnes of concentrated seawater and 9,000 tonnes of treated wastewater. Fukuoka District Waterworks Agency facility overview
#1 Best Overall
- ⚡ 8 Set 3-in-1 Science Discovery: Explore the wonders of green energy by creating power from three different sources: Saltwater Power, Cola Power, and Fruit Batteries!
- 🧪 Complete STEM Learning Kit: Includes everything needed for a successful experiment: Zinc (Zn) and Copper (Cu) plates, connector wires with clips, LED lights, measuring cups, and a detailed instruction guide.
- 🎓 Hands-On Education: Perfect for kids aged 8+, this kit teaches real-world physics and chemistry concepts through engaging, tactile play that builds confidence and critical thinking.
- 📦 Bulk Value for Groups: Our set comes with 8 individual experiment packs and extra cups, making it an ideal choice for science classrooms, homeschooling groups, or birthday party activities.
- ✅ Safe & Easy to Use: No complex tools or dangerous chemicals required! The step-by-step visual guide ensures a frustration-free experience for parents and children alike.
The Government of Japan describes Mamizupia as producing about 50,000 cubic metres of freshwater per day. Its feature says the concentrated seawater is about 8% salt, compared with roughly 3.5% for ordinary seawater. Those figures help explain why the facility uses desalination brine: the larger salinity difference provides the conditions for this PRO system. JapanGov’s feature on desalination and osmotic power
How much electricity is it designed to make?
The operator lists about 110 kW of planned net output and up to about 880,000 kWh of planned generation per year. The developer, Kyowakiden Industry, lists 230 kW gross and 110 kW net. The gross rating describes generation before the system’s own electricity use; net output is the more relevant figure for power left over after that use. Fukuoka District Waterworks Agency facility overview and Kyowakiden PRO osmotic power system
Rank #2
- This power generation experiment device serves as excellent tool for teaching and engaging student minds in scientific exploration.
- Discover the wonders of science with the Saltwater Power Generation Experiment Case, designed to stimulate curiosity and deepen understanding of electricity principles through hands on learning.
- Crafted from pp, clear color, easy to follow instructions that allow children to understand scientific concepts while having fun.
- Suitable for children aged 6 ＋, as well as students and enthusiasts interested in physics and electrical experiments.
- Enhancing your classroom or home learning environment with this interactive saltwater battery experiment set, unique way to introduce alternative energy sources and foster critical thinking skills.
These are planned or expected figures, not a published operating record. The facility started operation in August 2025, and the operator says its first five years are a verification period. The sources provide no measured annual total or generation time series, so it is not yet possible to say how much electricity the plant has actually produced over a year.
The operator also estimates utilization of about 90%, including maintenance downtime, on the basis that both water streams are continuously available. That is an estimate, not a verified post-start operating result. JapanGov’s comparison to the annual electricity use of about 300 average households is likewise based on expected yearly generation, not a count of homes currently supplied by the plant.
Rank #3
- This robot kit is a hands-on learning experience that illustrates the value of alternate energy sources
- The robot is powered by the chemical reaction of salt water and charcoal, and is safe and non-toxic
- This kit contains all the parts and materials needed to create a salt-water powered robot
- Detailed assembly instructions included
- Recommended for ages 8 years and up
Why pair power generation with desalination and wastewater treatment?
The project makes use of two water streams already produced or handled by nearby infrastructure: concentrated seawater from desalination and treated wastewater. That integration is the point of the installation; osmotic generation is not a stand-alone way to produce power from any seawater source without suitable infrastructure.
Because the energy source is the ongoing flow of water with different salinities, the process does not depend on sunshine or wind. That does not establish its cost, environmental performance, or ability to replace conventional grid generation. The available project sources do not provide a project-specific cost per kilowatt-hour, lifecycle emissions analysis, or measured ecological-impact study. Kyowakiden says the mixed discharge is returned to the sea at approximately seawater salinity, but that company description is not an independent marine-impact assessment.
Rank #4
- Discover the wonders of science with the Saltwater Power Generation Experiment Case,designed to stimulate curiosity and deepen understanding of electricity principles through hands on learning.
- Crafted from pp,clear color,easy to follow instructions that allow children to understand scientific concepts while having fun.
- Suitable for children aged 6 ＋,as well as students and enthusiasts interested in physics and electrical experiments.
- This power generation experiment device serves as excellent tool for teaching and engaging student minds in scientific exploration.
- Enhancing your classroom or home learning environment with this interactive saltwater battery experiment set,unique way to introduce alternative energy sources and foster critical thinking skills.
Can osmotic power use ordinary seawater?
Mamizupia’s operating system uses concentrated seawater, not ordinary seawater. The developer says it is developing a wastewater-treatment application using ordinary seawater and gives about 2030 as a target for implementation. That is a development goal, not an established commercial result or guaranteed date. Kyowakiden PRO osmotic power system
Free tools Windows power users keep installed
One-click scans. No signup required.
Quick Recap
Best Value
- BUILT TO MOVE! Kids ages 8 & up assemble a walking robot that’s powered by salt water and magnesium alone—no batteries required!
- CLEAN TECHNOLOGY: When salt water is added to the magnesium fuel cell, it creates a chemical reaction that produces a flow of electricity to power the robot.
- A LITTLE GOES A LONG WAY: An innovative pump mechanism provides a steady drip of salt water onto the magnesium plates; the robot walks up to 1 hour on just one drop of salt water!
- LONG PLAY VALUE: The “fuel” (i.e. salt water) tank is easy to clean, refill, and reuse for hours of exploration, and the kit includes three magnesium plates, each with an operating time of about four hours.
- EDUCATIONAL LESSONS, ENGAGING CONTENT: The 28-page, full-color manual guides assembly and experimentation and explores the science behind and benefits of non-toxic, long-lasting, alternative energy sources.
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
