How difficult can
this technology be? That was my first question when I read that Japan has
launched its first osmotic power plant in Fukuoka. If this is now operational
in a highly industrialized country, what is stopping us from trying it
here—especially when we already have the two basic ingredients: freshwater and
saltwater. In a country made up of more than 7,600 islands, these two resources
meet almost everywhere.
This brings us to the classic dilemma: to make or to buy? But if
Japan, through JICA, is willing to transfer the technology, then we neither
make nor buy—we simply cooperate. And why compete with Japan anyway if they are
willing to share their expertise? The real question is: Who in our government
is actually in charge of technology transfer? Is it the DOST? Is it the DFA? Or
is it, as often happens, nobody in particular—which means nothing happens at
all?
Japan’s new osmotic power plant is an example of innovation
grounded in simple natural processes. The technology, called salinity-gradient
energy or blue energy, generates electricity by mixing freshwater with seawater
through a semi-permeable membrane. The freshwater naturally moves toward the
saltier side, creating pressure strong enough to spin turbines. And unlike
solar or wind, this type of power operates continuously—day and night, rain or
shine. No clouds to block sunlight. No calm days to stop turbines. Just endless
mixing of waters that already meet in nature.
The Fukuoka plant is small by power-industry standards—around
880,000 kWh per year, enough to supply about 220 households or support water
treatment facilities but it proves that the technology works. It produces zero
CO₂ during operation and integrates neatly with existing systems, especially
desalination. In fact, Japan is turning brine—a by-product often viewed as
waste—into a clean and steady energy source.
Of course, the technology is not yet perfect. Membrane
maintenance remains a challenge. Salt buildup reduces efficiency. Biofouling
can clog the system. And costs are still higher compared to mature technologies
like solar PV. But we need to ask ourselves: Isn’t this exactly the stage when
we should enter—early enough to learn, but not too early that we bear the cost
of research and development?
We can let Japan do the expensive part—perfecting the membranes,
improving efficiencies, scaling the engineering. What we can do is study,
adapt, and adopt.
Imagine osmotic power plants in the Philippines: At the mouth of
the Pasig River feeding into Manila Bay; In Aparri, where the Cagayan River
meets the sea; In Surigao, where rivers descend into coastal waters; Even in
smaller barangays with creeks flowing into coves.
These could power water systems, evacuation centers, aquaculture
farms, or entire communities—all without adding to our carbon footprint. With
roughly 421 river basins nationwide, the potential is enormous.
But here’s the bigger issue: Do we even have a national strategy
for adopting frontier technologies? Or are we always waiting for someone else
to decide for us? If the DOST is responsible, where are the feasibility
studies? If the DFA is in charge, where are the agreements with Japan? And if
nobody is really tasked with this, then our system needs repair.
The future will not wait for countries that hesitate.
Japan has shown that osmotic power is no longer theoretical. It
is here, working, and improving. For the Philippines—a nation literally shaped
by water—this might be the renewable energy opportunity that fits us better
than any other.
So, I ask again: How difficult can this technology be? The truth
is, the bigger challenge may not be science—but our willingness to act.
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