Comprehensive renewable resource assessment of Gili Iyang Island for hybrid power system design (4 citations).
Drag the turbine marker on the map to reposition. Yield estimates assume 28% capacity factor for wind and 78% system efficiency for solar at Gili Iyang conditions.
Indonesia's 17,000+ islands face significant electrification challenges, with many coastal communities relying on expensive diesel generators. Gili Iyang, known as the “oxygen island” tourism destination, requires reliable electricity for tourism infrastructure while preserving its environmental reputation.
Designing cost-effective hybrid renewable systems for islands requires accurate wind speed and solar irradiance data at sufficient spatial resolution. Without measured on-site data, system sizing relies on coarse satellite estimates or distant weather stations that may not capture local coastal wind patterns.
Prior to this study, no comprehensive renewable resource assessment had been conducted for Gili Iyang. The lack of ground-truth data left planners unable to determine whether wind-solar hybrid systems could economically displace diesel generation for the island's estimated 800 kWh/day load.
Hybrid wind-solar-battery systems can reduce energy costs by 62% compared to diesel-only generation for Gili Iyang's estimated 800 kWh/day load.
A hybrid wind-solar-battery system on Gili Iyang can displace 70-85% of diesel generation, with exact percentage depending on seasonal wind patterns and load profile.
Click any measurement point on the map to view its wind and solar resource data. Toggle between Wind and Solar views to compare spatial resource distribution.
The study conducted comprehensive wind and solar resource measurements across Gili Iyang at 77 sites over multiple seasons. Sigit contributed to measurement system design, data analysis, and hybrid system sizing calculations.
Wind measurements used anemometers at 2 m and 10 m heights for wind shear analysis, while solar data combined pyranometer measurements with satellite-derived estimates. The analysis determined capacity factors and optimal turbine/panel configurations for various load scenarios.
Wind rose analyses revealed dominant wind directions from the west (25% frequency at 6.0 m/s mean) and east (22% at 5.8 m/s), while solar irradiance showed minimal seasonal variation at 4.8-5.2 kWh/m²/day, making Gili Iyang suitable for complementary wind-solar generation.
Wind peaks Jun-Aug (5.5-6.2 m/s), solar peaks Mar-May and Aug-Oct (5.1-5.2 kWh/m²/d). Complementary seasonal patterns support hybrid system design.
Wind provides 42% and solar 36% of total load on average. The remaining 22% requires diesel backup, primarily during November-April when wind declines.
The west to south coast showed highest wind potential with average speeds of 5.6 m/s. Solar irradiance averaged 5.0 kWh/m²/day with minimal seasonal variation (4.7-5.2 range). A hybrid wind-solar-battery system could displace 70-85% of diesel generation for typical island loads.
Wind provides approximately 42% of total energy on average, solar 36%, with the remaining 22% requiring diesel backup during November-April when wind speeds decline. The complementary nature of the two resources supports a more reliable hybrid system than either resource alone.
The measurement campaign deployed portable anemometer rigs at 2 m and 10 m heights across 77 sites, capturing wind speed and direction data at 10-minute intervals. Solar data was collected using a combination of on-site pyranometer readings and satellite-derived GHI estimates from the NASA POWER database, cross-validated where co-located measurements were available.
Wind shear coefficients were calculated from dual-height measurements to extrapolate wind speeds to turbine hub heights (12-30 m). Seasonal wind rose diagrams were constructed for each measurement zone to identify optimal turbine orientation and placement.
Hybrid system sizing used the HOMER Pro microgrid optimization tool with site-specific resource data, load profiles estimated from island community surveys, and cost data for small wind turbines, solar PV panels, battery storage, and diesel generators. The optimization minimized levelized cost of energy while maintaining reliability constraints.
AIP Conference Proceedings, 2024
DOI: 10.1063/5.0194117
Same research program — spatial air quality analysis across the island.
Applied solar system sizing in East Java using similar renewable assessment methodology.
Provides the solar measurement instrumentation used in the resource assessment.
Part of a broader research program on Gili Iyang's environmental and energy characteristics. The resource data from this study underpins subsequent hybrid system designs for Indonesian coastal islands.