> For the complete documentation index, see [llms.txt](https://docs.greenbtc.club/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.greenbtc.club/v1-getting-started/art-and-arec.md). # ART and AREC ## AREC AREC, Arkreen Renewable Energy Certificate, is the REC issued on the basis of the renewable energy generation proof sourcing from the Arkreen Network. With the help of high efficiency and amazing composability of the Web3 technology, AREC targets to be the fundamental financial instrument to gear up the global carbon emission reduction progress. ## ART ART tokens are minted while an AREC NFT is liquidized by the user. Liquidization is the process in which the user transfers the owned AREC NFT to the ART smart contract, the AREC NFT is set to ***Liquidized*** state, and the exact same amount of ART tokens as the amount of the RE output in the liquidized AREC NFT are minted to the user's account. **1 ART = 1000 kWh**