Operating cold storage spaces for perishable food is challenging and costly in areas with unreliable grid power. Promethean Power Systems designs and manufactures refrigeration systems for cold-storage and milk-chilling applications in off-grid and partially electrified areas of developing countries. To date, the company has sold over 500 units and served over 25,000 farmers in India. The team from the Massachusetts Institute of Technology (MIT) participated in VentureWell’s E-Team program in 2007. VentureWell invested in the company in 2012.