
Rural Electrification: Are Mesh Grids a Game Changer?
Of the nearly 10 million people without access to electricity in Latin America and Caribbean, over 60% are in Haiti. This lack of access to affordable and reliable power has hindered the island’s development, affecting communities and businesses, and limiting the nation’s ability to weather worsening climate events.
Until recently there were two options for rural electrification in areas not reached by the grid: mini-grids and solar home systems. But both come with their challenges.
While solar home systems are flexible, fast, and simple to install, with the ability to provide adequate power for basic household needs such as lighting and phone charging, they do not provide enough energy or power for productive use – which is key for long term sustainability.
Mini-grids on the other hand can supply large amounts of power, but for rural areas where average household consumption is less than 5kWh/month, they are expensive and require subsidies of around $1,000 per connection to make them financially viable. Additionally, the World Bank estimates that annual mini-grid installations need to increase by 40 times in order to meet 2030 electrification goals, but high capital grant requirements often inhibit them from scaling up.
A number of trends have transformed the landscape for off-grid technology in the last decade including:
- An unprecedented improvement in the efficiency of lighting, and appliances in the last ten years, with the power needed for a household to have lighting, phone changing, fans and a TV having been reduced from 50 kWh per month to 5 kWh per month
- A more than 80% reduction in solar panel and battery prices over the last ten years
- Sophisticated software that allows multiple power sources to be linked
- Internet of things (IoT) software that monitors and detects faults remotely
These advances have allowed mesh grids to emerge as a technological alternative with the potential to overcome the barriers solar home systems and mini-grids face.
Engineers have designed solar PV-based mesh grids which co-locate generation of electricity with the user. With mesh grids, households predominantly produce the electricity that they use from panels on their roof. To get the backup that a grid provides, households are linked with a 50V DC grid allowing generation and use to be shared among nearby households. The household systems are designed to be modular and ‘plug and play,’ which allows for economies of scale in manufacture and for the grid to be easily reconfigured if demand changes. With both DC and AC provided, higher efficiency DC equipment can be used wherever possible. Mesh grids combine the simplicity and ease of use of solar home systems, with the resilience of a grid, and the long-term customer service of a utility.