John Wanina Karanja, CEO of Melanin Solar and co-founder of Bitab Africa, presents at the Black Blockchain Summit about sustainable energy adoption in black communities through blockchain technology. He discusses the significant energy access challenges in Africa, where 600 million people lack reliable power, and the potential of leveraging cryptocurrency mining to capture and store solar energy. Melanin Solar aims to empower households by creating a peer-to-peer energy market and installing smart boxes for energy transactions. The initiative seeks to target countries in Africa and the Caribbean, aiming to connect 500,000 households by 2025. Karanja emphasizes education and training for engineers to support this vision.