# Solomon Islands Power & Grid Engineering Profile

> Preliminary country engineering reference. Connection voltage, short-circuit duty, earthing and regulatory approval require current project-specific confirmation from the local TSO/DSO.

**Canonical:** https://voltformer.com/country-profile/solomon-islands - markdown: https://voltformer.com/country-profile/solomon-islands.md - ISO: SB

## Electrical system

- Frequency: 50 Hz
- Transmission voltage candidates: 33, 11 kV
- Distribution voltage candidates: 11 kV
- Low-voltage candidates: 415, 240 V
- Typical vector groups: Dyn11, Yzn11
- Typical tap range: ±2x2.5%

## Power quality and grid operating limits

- Normal frequency operational tolerance: ±0.3 Hz
- Steady-state voltage tolerance: ±6 %
- Maximum continuous THD-V at MV PCC: ≤ 5 %
- Maximum negative sequence voltage unbalance: ≤ 2 %
- Grid code power factor range at PCC: 0.90 cap - 0.95 ind

## Substation short-circuit and earthing

- Typical MV bus symmetrical fault rating: 16 kA RMS (1s / 3s)
- Typical HV substation breaking capacity: 25 kA RMS
- MV neutral earthing regime: low-resistance
- LV customer earthing system: multiple-earthed-neutral-MEN

## Dielectric insulation coordination

- MV Lightning Impulse Withstand (BIL): 75 kV peak (1.2/50 µs)
- MV Power Frequency Withstand (1 min): 28 kV RMS (50/60 Hz)
- Minimum specific creepage distance (SPS): 35 mm/kV phase-to-phase
- IEC 60815 pollution severity classification: Class IV (Very Heavy)

## Electromechanical and environmental design

- Design peak ground acceleration (PGA): 0.4 g (IEEE 693 / Eurocode 8)
- Basic design wind speed: 50 m/s (~180 km/h)
- Substation acoustic noise limit at 1m: ≤ 55 dBA
- Extreme minimum design ambient temperature: 20 °C
- Maximum 24-hour daily average ambient temperature: 32 °C
- Maximum solar radiation heat flux: 1100 W/m²
- Atmospheric corrosivity category (ISO 12944-2): CX (Extreme)
- MV bushing connector interface standard: EN 50180 / EN 50181 (Interface A/B/C)

## Standards and efficiency

- Standards/codes: IEC 60076, AS/NZS 60076, Solomon Power Code
- Regulatory standard code: AS/NZS 60076.1 / Solomon Power Standards
- Benchmark minimum efficiency (PEI / 1000 kVA): 99.38 %
- Regulatory enforcement: mandatory
- Efficiency regulation notes: Solomon Power Technical Grid Specifications

## Grid energy economics and carbon intensity

- Benchmark industrial electricity tariff: $0.38 / kWh (TCO capitalized loss A & B factor evaluation)
- Grid carbon emission intensity: 690 g CO2eq/kWh (Scope 2 lifecycle emissions assessment)
- National renewable energy share: 8.5 % (grid inertia & inverter-based resource impact)
- Primary official statistical source: Solomon Power / MMERE

## Advanced engineering calculation parameters

- Substation network X/R ratio: 7 (IEC 60909 fault impedance modeling)
- Dynamic peak short-circuit factor (κ per IEC 60909): 1.66 (ip = κ · √2 · Ik'' electrodynamic force)
- Regional reference apparent soil resistivity (ρ): 240 Ω·m (IEEE 80 / IEC 61936-1 substation earthing)
- Recommended transformer harmonic K-factor rating: K-4 (ANSI/IEEE C57.110 eddy derating)

## Official public regulatory and grid authorities

- [Solomon Power - Solomon Islands Electricity Authority Technical Operating Standards](https://www.solomonpower.com.sb) (transmission-operator)
- [MMERE SI - Ministry of Mines Energy and Rural Electrification Solomon Islands](https://www.mmere.gov.sb) (energy-regulator)

## Grid operators

- Solomon Power (Solomon Islands Electricity Authority)

## Climate design reference

- Reference ambient: 40 °C
- Maximum design ambient: 45 °C
- Standard altitude basis: 500 m
- Notes: Pacific Ring of Fire extreme seismic/tsunami risk (PGA 0.40g), cyclone path (50 m/s), Tina River 15 MW hydro project.

## Typical applications

- Honiara Urban Capital Distribution & Substation Network
- Tina River 15 MW Hydroelectric Power Project Step-Up Substations

## Safe project candidates

- Nominal voltage candidates: 11, 33 kV
- LV utilization-voltage candidates (line-to-line and/or line-to-neutral; confirm the transformer's rated terminal voltage and phase configuration): 415, 240 V
- Vector group candidates: Dyn11, Yzn11
- Automatic nominal voltage: withheld - point of connection required

## Mandatory project verification

- pointOfConnectionVoltage
- prospectiveShortCircuitCurrent
- systemEarthingAndNeutral
- insulationCoordination
- protectionCoordination
- powerQualityAndHarmonics
- siteAmbientAndAltitude
- seismicWindPollution
- utilityApproval

Machine data: https://voltformer.com/api/v1/countries/SB - all profiles: https://voltformer.com/country-grid-standards.json - grid checker: https://voltformer.com/grid-standards