From transferring millions of customers to a new billing system at the height of the pandemic to steering the company through the worst cost of living crisis in memory, outgoing Eon chief executive Michael Lewis admits the biggest challenges of his three-decade career have all come within the last three years. The young environmental specialist who joined what was then Powergen in 1993 could never have foreseen the “perfect storm” of challenges that he would one day be facing. As he departs the company, Lewis gives Utility Week a glimpse into the toughest years of his career, while spelling out his hopes for the future of the sector.