Energy & Green Tech

Building a better, cheaper battery for power grids

Batteries do the heavy lifting to store excess solar energy on power grids for use after sundown, but to operate, they also rely on pricey elements like platinum.

Energy & Green Tech

Sudan's electric rickshaws cut costs, help environment

Sudanese entrepreneur Mohamed Samir watches proudly as workers assemble garishly coloured rickshaws, unique in the North African nation because they run on electricity in a bid to tackle soaring costs.