Select your localized edition:

Close ×

More Ways to Connect

Discover one of our 28 local entrepreneurial communities »

Be the first to know as we launch in new countries and markets around the globe.

Interested in bringing MIT Technology Review to your local market?

MIT Technology ReviewMIT Technology Review - logo

 

Unsupported browser: Your browser does not meet modern web standards. See how it scores »

{ action.text }

Targeted toward people in poor countries, this power supply, sold with a photovoltaic panel, provides electricity only after the user sends a code from a prepaid card over a mobile phone. The code unlocks the system until a set number of kilowatt-hours is consumed. Users buy cards until the cost of the entire system has been paid off, after which it unlocks permanently.

Product: Simpa solar energy system
Cost: Starting at $150
Availability: January 2012
Source: www.simpanetworks.com
Company: Simpa Networks

Credit: Simpa Networks

Tagged: Energy

Reprints and Permissions | Send feedback to the editor

From the Archives

Close

Introducing MIT Technology Review Insider.

Already a Magazine subscriber?

You're automatically an Insider. It's easy to activate or upgrade your account.

Activate Your Account

Become an Insider

It's the new way to subscribe. Get even more of the tech news, research, and discoveries you crave.

Sign Up

Learn More

Find out why MIT Technology Review Insider is for you and explore your options.

Show Me