https://www.cnbc.com/2018/11/07/blockchain-tech-is-taking-on-renewable-energy-trading-in-one-country.html

Blockchain, the technology underpinning cryptocurrency bitcoin, has been recommended and theorized for uses across a broad spectrum of sectors and countries. Now, one Southeast Asian city-state is putting the tech to work in reshaping its energy industry.

In Singapore, companies can buy and sell so-called renewable energy certificates (RECs) that represent a unit of green energy production from the likes of wind or solar power. The idea is that firms seeking to offset their non-green energy production can purchase RECs from a company producing excess green power.