Clean Energy 101: Renewably Powered Minigrids - RMI

This fact sheet from RMI explains the function and application of renewably powered minigrids (and microgrids), detailing three primary configurations—isolated, undergrid, and interconnected—and providing global examples of their use in enhancing energy resilience and access in the Caribbean, Africa, and the United States.

• Renewably powered minigrids, also referred to as microgrids, typically combine renewable energy sources like wind turbines or solar panels with battery storage and occasionally backup generators. While the terms are used interchangeably in the text, microgrids generally power specific applications such as hospitals or schools, whereas minigrids are larger and can support entire regions or communities.
• There are three main configurations of minigrids based on their relationship with the main electricity grid: isolated minigrids are stand-alone systems for rural areas without national infrastructure; undergrid minigrids use existing distribution networks in areas with unreliable service but do not exchange power with the main grid; and interconnected minigrids are connected to the main system, allowing them to purchase energy when needed to lower battery costs.
• In the Caribbean, minigrids are used to maintain critical facilities during extreme weather. Examples include a 390 kilowatt solar microgrid on Ragged Island in the Bahamas that meets 93 percent of the island's energy needs and 10 kilowatt solar microgrids with 76 kilowatt-hours of battery storage at the Morne Prosper and Paix Bouche schools in Dominica.
• In Africa, minigrids improve reliability for homes and businesses. In Nigeria, the Zawaciki interconnected minigrid features 1 megawatt of solar power and 1 megawatt-hour of battery storage, increasing power availability for some users from four hours a day to 16-20 hours. Additionally, an undergrid minigrid in Mokoloki, Nigeria, utilizes 100 kW of solar PV and 194 kWh of battery storage to power a health clinic, bakery, and other local services.
• In the United States, minigrids are deployed for remote energy independence and military resilience. Kotzebue, Alaska, uses a system with 2 MW of wind turbines, 1 MW solar array, and 1.2 MW of battery storage to displace 350,000 to 400,000 gallons of diesel annually. In 2024, the US Army installed a minigrid at Fort Hunter Liggett in California with 2.5 MW of solar and a 5 MWh battery, providing 14 days of coverage during grid outages.

APA

RMI (2025). Clean Energy 101: Renewably Powered Minigrids - RMI. https://rmi.org/resources/clean-energy-101-renewably-powered-minigrids/

Chicago

RMI. Clean Energy 101: Renewably Powered Minigrids - RMI. 2025. https://rmi.org/resources/clean-energy-101-renewably-powered-minigrids/.

Wikipedia

{{cite report |author=RMI |title=Clean Energy 101: Renewably Powered Minigrids - RMI |date=11 December 2025 |url=https://rmi.org/resources/clean-energy-101-renewably-powered-minigrids/ |access-date=17 August 2026 |via=Climate Insights Directory}}

BibTeX

@techreport{rmi2025clean, author = {{RMI}}, title = {{Clean Energy 101: Renewably Powered Minigrids - RMI}}, institution = {RMI}, year = {2025}, month = dec, url = {https://rmi.org/resources/clean-energy-101-renewably-powered-minigrids/}, urldate = {2026-08-17}, note = {Indexed by Climate Insights Directory} }