Ross Mackay is Co-Founder and CPO at tem, an AI-native energy transactions platform connecting UK businesses directly with renewable energy generators. tem has raised over $94 million total funding and serves 2,600+ customers including Boohoo, Fever-Tree, and Newcastle United FC.

Ross studied at The University of Manchester and previously worked at Eigen Technologies and Limejump, where he gained deep energy sector expertise. He co-founded tem in 2021 with three other former Limejump colleagues.

Ross and his co-founders witnessed firsthand the inefficiencies of traditional wholesale energy markets, inspiring them to build a platform that removes middlemen and reduces business energy bills by up to 30%. tem facilitated over 2TWh of energy transactions in 2025 alone.

tem raised a $75 million Series B in February 2026 led by Lightspeed Venture Partners, valuing the company at over $300 million. The platform uses AI to process 1.8 billion energy matches every second.

tem is democratizing renewable energy access across the UK and expanding to Texas and Australia. The company aims to become the Stripe of energy by building AI-native infrastructure that makes energy transactions fairer, more transparent, and radically more efficient.