Ask HN: How can programmers propel the clean energy usage?

Hello HN folks,

I'm a programmer and deep in my heart, I consider myself an engineer(generic). So, quite naturally, I'm interested in and excited by what Elon Musk is doing in the clean energy sector. So, I'm wondering if there's anything that developers can do in the field of clean energy, energy saving & management. I've a few basic ideas for IoT systems for energy management etc. But these ideas are independent of the energy source.

Are there any companies that develop software systems related to clean energy? Is there any scope for programmers to be a part of the clean energy movement? What do you think? Share your thoughts. :)