エネルギーと環境を考える

Challenge of decarbonizing island regions throughCity-to-City collaboration projects
National Climate Change Coordinator and Focal Point to the UNFCCC
Office of Climate Change, Office of the President, The Republic of Palau
Japan NUS CO LTD
The Okinawa Electric Power Company, Inc.

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Overview of Palau
Key Impacts
1. Increased air Temperature
2. Stronger storms and typhoons
3. Ocean changes
4. Increased rainfall
5. Sea level rise

Mitigation plans and targets
1) Transportation
2) Solid waste management
3) *Energy Sector

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2

Palau government's climate change measures

Palau Climate Change Policy
Nationally Determined Contribution
Moana Pledge

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3Efforts and expectations for achieving goals

1) Installation of battery storage2) Upgrading the grid system
3) Further deployment of renewable technologies through partnerships

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4

City-to-City collaboration projectC2C project aims to implement： Initiatives tailored to the region
 Multi-stakeholder collaboration
 Spread of good practices

・・・As effective efforts towards decarbonization

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5Decarbonization in island regions• Challenges– Small scale– High cost
– Resources shortage• Potentials– It is close to achieving 100% RE, because it is small in scale.
– RE costs can be lower than fossil fuels because fuel is expensive.
– Resolving the human resource shortage with new industries.
– Covering effective renewable energy resources with technology.
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6

Urasoe, Okinawa JAPANConcluded a comprehensive partnership agreement with The Okinawa Electric Power Co., Inc. to solve regional
issues and develop sustainable communities
Overview of Urasoe City•North•
Urasoe Okinawa
NahaSouthCentre•

Population growth isremarkable, andcommerce andindustry are active.
The fourth largest city
in Okinawa, with apopulation of about
116,000.
More than 14% of the
19.48㎢ area is
occupied by US
military bases.

Installation results:
Urasoe Junior High School
PV capacity

Service outline diagram
Okinawa New energy
development Co.inc

Battelycapacity

Solar power supply

Owned by Okiden

17% of annual power consumption

PV systemBattery

CO2 emission reduction: 73t

Free of charge

Same as 8332 trees

Third party ownership model
Electricity supply
Purchasing electricity
from solar and storage
batteries

Okiden(Okinawaelectricity powercompany)

Electricity supply
Purchase grid power for theshortfall from Okiden

PV panel

Examples of electrical equipment

Battery
Lighting equipment

PC Smart phone Copy machine phone

Good practice of multi-stakeholder collaboration 7
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Collaboration Structure
Cooperation
Palau Public Utilities
Corporation（PPUC）

C2C Collaboration

Urasoe City

Airai State

Dissemination of good practices of Urasoe city
Solutions to the Renewable Energy Deployment
Challenges in Airai StateCooperation

Retractable wind generation system

Okinawa Electric Power Co., Inc.

Technology and service introduction study
Effectiveness verification

PV-PTO

Integrated Control
Potential Study
Feasibility Study

Potential Study
Feasibility Study

Technology and service introduction study
Effectiveness verification

Project management/commercialization support
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8Renewable Energy Deployment andDecarbonization Initiatives in the Republic of Palau
December 6, 2023

About Okinawa Electric Power Company (OEPC)

Palau■ Supplies electricity to 38 inhabited islands of Okinawa Prefecture situated at the southern tipof Japan, over a distance of 1,000 km from east to west and 400 km from north to south■ Engaged in research, development and operation of hybrid power generation using
renewable energy and diesel power for over 30 years given a topography that makes
hydropower development difficult■ First electric power company to declare "Zero Emission by 2050" in line with the Governmentof Japan policy (2020)

Renewable Energy Development and Operation■ Deployment of Tiltable Wind Turbines: First in Japan
Tilting prevents damage during typhoons
OEPC Group installed 5 units in Tonga in 2019 through ODA*First Japanese ODA for wind power deployment■ Establishment of Grid Stabilization Technology (MG Set)
Supplies electricity derived from renewable energy to the grid via
storage batteries
Achieved 100% renewable energy operation on Hateruma Island
for approx. 10 days
Supplyingelectricity by100%renewableenergyMG Set Installed on Hateruma Island
Demand (Customers)

RenewableenergyMG setMotor

Absorption offluctuations
in renewableenergyGenerator

Part of theincrease inrenewableenergy output(Absorption of MG set output)

BatteryFuel

Appearance of the MG Set■ Small Scale Microgrid System (ex. Kurima Island)
Leading example of regional energy-sharing using renewableenergy and storage batteries
Capable of supplying electricity to the area independently inthe event of a grid failure
Microgrid
MG-EMSPower grid

Supply-demand
adjustment

Demand-sideEMS

PV

Auxiliary charge
DG auxiliarycharge■ Free Solar Panel and Storage Battery Installation Service
Installation of solar panels and storage batteries with zero initialcost to the customer
Electricity from solar panels and storage batteries can be usedeven in times of disaster

Residences: 384 (2.1 MW)
Businesses: 22 (1.8 MW)
Total installed: 406
Total output: 3.9MW

Stand-alone
operationMG storagebattery

Image of MG set grid connection

G : Generator
M : Motor
D : Diesel engine

BESSEQ
water heater, BESS: Storage battery

As of June 30, 2023
（deployed in the main islandand major remote islands.）

Phased Renewable Energy Deployment in the Republic of Palau
STEP 1Renewable Energy Source
Deployment Phase

Selection of renewable energy sources suited for the site considering landuse, natural environment, and other factors(Solar (Palau: 13 MW mega solar), Wind turbine, etc.)

STEP 2
Renewable Energy Utilization
Improvement Phase (1)Initiatives to increase the utilization rate of renewableenergy sources deployed by power producers(MG sets, grid storage batteries, and technical studies using
analytical tools)

STEP 3
Renewable Energy Utilization
Improvement Phase (2)Expanded use of distributed renewable energy on the demand side as an
initiative to deploy and increase the use of renewable energy while
reducing impacts on the grid(DR using controllable load, consumer-side storage batteries, etc.)

STEP 4Full-Utilization Phase

Efficient grid operation integrating diesel power generation, renewableenergy power sources, and demand-side facilities(Area Aggregation)

Palau is currently atthis phase

Seek to achieve renewable energy deployment targets through phased implementation of measures
tailored to the local conditions in the Republic of Palau, along with steady capacity building of engineers
in each country for enhanced sustainability.

Palau-style Decarbonization Model (Palau Pacific Resort)
Establish a model case of carbon neutrality (STEPS 1-4) and spread it throughout the Republic of Palau.

Deploy throughout the Republic of
Palau to promote decarbonization

Overview of Palau Pacific Resort
Initiatives at Palau Pacific Resort (PPR)

Establishment : December 1984
Rooms : 172

The following initiatives are being studied and implementedfor PPR, which is an independent grid that supports its loadby small-scale diesel generation.
■ Deployment of renewable energy (solar) andgrid stabilization using storage batteries■ Establishment of a hybrid power generation system
consisting of diesel and renewable energy■ Exhaust heat recovery to use for air conditioning,and control by controllable load

DG

DGPV

water heaterEV

Storagebattery
EMS