Technology:
Mitsubishi Heavy is developing a new wave power generation system that sets a structure on
the sea side of a breakwater. The structure is like a box, and air inside the
structure is pushed out when a wave comes into the structure to run a turbine
of the generator. Because the structure can bring in waves coming from diagonally,
the system has two times higher generation efficiency than the existing system.
As a result, the company opened up the road to reduce the generation cost to 40
yen per kW. Although the total power output depends on how many units are built
on a breakwater, it is possible to get a generation capacity of 1 mega watt to
supply electricity to 200-300 households.
Bridgeand Steel Structure Engineering, a subsidiary of Mitsubishi Heavy, will install
a demonstration system in 2014 to start the substantiative experiment using a
breakwater in the Tohoku district. The construction cost is about 400 million
yen per unit. The system is basically designed for isolated islands where
energy cost is rather high. The Japanese government reckons that the
introduction of renewable energy in 2012 will increase 12% over the previous
year to about 2,500,000 kW on an output basis thanks to the system introduced in
July this year to purchase electricity generated by renewable energy at
favorable fixed prices for 10-20 years.
Generation cost, feature, and problem of major
renewable energy types
Type
|
Ocean
|
Photovoltaic
|
Wind
|
Geothermal
|
Generation cost per kW/h
|
Aiming for less than 40 yen
|
33.4-38.3 yen (Residence)
|
9.9-17.3 yen
(On land)
|
9.2-11.6 yen
|
Feature
|
Possible to generate throughout the year
|
Easy to install and operate
|
Possible to generate regardless of time
|
Possible to generate throughout the year
if hot water is available
|
Problem
|
Cost and waterproofing technology
|
Impossible to generate at night
|
Generates low-frequency sound
|
Available places are mostly inside a
national park
|
The
concept of Mitsubishi Heavy’s wave power generation system
The
image of Mitsubishi Heavy’s wave power generation system
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