Solar cells have come a very long way since they were invented in 1941. And now they are going a very long way too. In fact, Solar Impulse 2, an airplane powered solely by solar cells, is going to circumnavigate the globe over five months, in 25 flying days, without a drop of liquid fuel on board.

And while solar cells continue to prove themselves in the air, on the ground, solar energy as a sustainable alternative source goes from strength to strength. Solar capacity continues to increase. And costs continue to drop.

USA Residential Solar Power – Installed Cost per Watt

Source: Solar Power Now

About the Author:
Thomas Butcher is an independent writer, researcher and consultant focusing on strategic materials, in particular metals. With 35 years of experience in the financial world, he has lectured and spoken at conferences around the world. Amongst other things, he currently writes the Letter from North America for the Minor Metals Trade Association's bi-monthly publication The Crucible, and was lead author of the chapter on gallium (used in solar cells) in the British Geological Survey's «Critical Metals Handbook».

The article above is an opinion of the author and does not necessarily reflect the opinion of MV Index Solutions or its affiliates.