Currently listed on CoinExchange: https://www.coinexchange.io/market/NRG/BTC as well as

Crypto-Bridge: https://wallet.crypto-bridge.org/market/BRIDGE.NRG_BRIDGE.BTC

Energi was founded early in 2017 by Tommy World Power (https://twitter.com/TommyWorldPower) and is intended to improve upon the self-funded governance concepts found in projects like Dash and Smartcash.

Official website: https://www.energi.world/