E.ON said Somerville (pictured above) is "building the company’s marketing effort around a truly integrated paid, owned and earned approach".
Moore has left the energy company, which she joined in 2016, to work at law firm Birketts LLP as marketing business development director.
Somerville, who has worked at E.ON for more than 11 years, been head of brand and marketing since 2018. He previously held roles at PR agencies including Trimedia and Atlantic Communications & PR.
E.ON said Somerville is working directly with UK chief executive Michael Lewis, adding: "Scott built his career in integrated brand, marketing and PR agencies helping businesses earn connections with consumers to protect and improve their reputation through engaging storytelling and creative strategies. He has carried forward that belief set and for nearly a decade he has been at the heart of E.ON’s marketing and communications activities.
"During this time he has progressed through its ranks and is helping to build its transformation into a sustainable organisation truly focused on its customers and renewable energy."
Moore told PRWeek: "During my time at E.ON I was proud of the work the team did in constantly pushing how we presented ourselves externally and how we found new and innovative ways to talk to people about the importance of switching to renewable energy.
"Last year our campaign to raise awareness on the issues associated with pollution and the need to ‘clear the air’ was especially impactful - as evidenced by the many awards we won. I am sure the team will continue to develop thought provoking and challenging work and I look forward to seeing what comes next."
Npower communications and corporate responsibility director Guy Esnouf stepped down in April following the energy company's acquisition by E.ON in 2019. The latter folded Npower's domestic and small business customers into its existing British business.