Department : Civil Engineering

Course : International Program of Maritime and Urban Engineering

Student ID : 28J16118

Name : PUTIKA ASHFAR KHOIRI

Email : putika@civil.eng.osaka-u.ac.jp

Title of the lecture : Special Topics on Global Architecture

Sub-Theme A : Creation and Protection of Symbiotic Society

Title of the lecture : Technologies for Symbiosis with Ocean

Teacher in charge : Kazuhiro Ijima

LCOE (Levelized Costs of Electricity) of OTEC (Ocean Thermal Energy

Conversion) in Halmahera, Indonesia

Halmahera district is located in the Eastern Province of North Maluku. East Halmahera located at 1°

4 '- 0° 40' LS and 126° 45 '130° 30' east longitude. Halmahera is the one of remote island in Indonesia

that still lack of electricity, because the electric will be turn off at 6.00- 18.00 WITA

The distribution of fuel to North Maluku province in Indonesia are served by PERTAMINA UPMS VIII

Jayapura are shown in Table 1. PERTAMINA UPMS VIII supply the distribution of fuel in Papua

province, Maluku Province and North Maluku Province. The data shown that total power system

requirement in Maluku and North Maluku Province is 663 Gigawatt-hours in 2014 including the requirements for household, commercial, public and industry in those area.

Table. 1 The Balance of power system in Maluku and North Maluku 2010- 2014

The estimation of the net power from 100 kilowatt input is 93.103 kilowatt. The Source of OTEC

potential is 93,1 %from 55 km Halmahera beach. The distance between 100 Megawatt OTEC is 10

km, means that potential power for each kilometre is {100/10} MW. Capacity factor of OTEC is 0.8.

Table 2. Electrical potential Calculation assumption

LCOE is calculated by dividing total life-time cost by total energy generated. Total lifetime cost is

estimated as well as other variable including inflation, income and expenses per-year. Payback period (N) are estimated by

𝑁 = log(𝑌

log 𝑂[𝑦𝑒𝑎𝑟])

𝑌 = (𝐼 − 𝑐𝑐)𝑋

𝑂 = (𝑖 + 1)/(1 + 𝑑)

𝑋 = 𝑑 − 𝑖/𝐴

CC = estimated cost

I = inflation

D= discount rate

A = income and expenses per-year.

Table 3. Estimation variable to calculate payback period

In this project the OTEC system will propose with land-based system. The Land-based system does

not require a sophisticated mooring system, lengthy power cables and more extensive maintenance

as required with open ocean environment. By using the land-base system is cheaper, safer and easier than using the off-shore system.