St. Vincent and the Grenadines presents a uniquely interesting case for solar economics: a main island grid operated by VINLEC, supplemented by smaller isolated grids serving Union Island, Bequia, Mustique, Canouan, Mayreau, and the Tobago Cays. Each island has its own electricity cost structure, and the outer islands — with their isolated diesel-dependent grids — typically face the highest rates in the entire OECS region. Solar makes compelling economic sense across the system, but especially on the outer islands where diesel costs are highest.
The Main Island: VINLEC on St. Vincent
VINLEC serves St. Vincent proper at rates of approximately EC$0.36–0.44/kWh. The utility has been progressive about renewable energy integration, with small wind and hydro contributing to the generation mix. VINLEC's net metering framework allows residential systems to receive credit for exported power, and the utility has been more cooperative than some regional peers in approving interconnections. At EC$0.40/kWh, a 5kW residential system saves approximately EC$6,820/year. Installed cost of approximately XCD 41,000–47,000 gives a payback of 6.0–6.9 years.
The Grenadines: Where Solar Economics Are Strongest
The outer Grenadine islands operate on isolated mini-grids powered almost entirely by diesel. Electricity rates on islands like Union Island, Bequia, and Canouan are often EC$0.55–0.70/kWh or higher — significantly above main island rates — reflecting the cost of shipping diesel to small, remote islands and the inefficiency of very small generation units. At EC$0.60/kWh, a 5kW solar system saving 17,000 kWh/year generates approximately EC$10,200 in annual savings. Against a system cost of XCD 45,000–52,000, payback is 4.4–5.1 years — exceptional economics by any measure.
Resilience in the Grenadines
For the outer islands, energy resilience is not an abstract policy goal — it is a daily operational reality. Diesel supply chains to small islands can be disrupted by weather, mechanical failures, or supply shortages. Properties on Bequia, Mustique, and Canouan that have invested in solar-plus-battery systems have effectively energy independence during disruptions. The premium properties and resorts on Mustique and Canouan have been among the earliest and most aggressive solar adopters in the Eastern Caribbean, driven by both economics and the luxury market's increasing ESG requirements.
XCD Investment Summary by Island
St. Vincent main island: XCD 44,000 system, EC$6,820/year savings, 6.5-year payback. Bequia: XCD 48,000 system, EC$9,360/year savings (at EC$0.55/kWh), 5.1-year payback. Union Island: XCD 50,000 system, EC$10,200/year savings (at EC$0.60/kWh), 4.9-year payback. Canouan resort system (50kW): XCD 185,000 system, EC$98,000/year savings, 1.9-year payback at EC$0.70/kWh rates. The outer Grenadines represent some of the most compelling solar economics in the entire Caribbean.