Shares in German renewables utility Innogy surged on the stock exchange amid unconfirmed media reports that French energy giant Engie is weighing an offer for Innogy, which now has a market capitalisation of €18.46bn ($19.64bn)

Innogy shares soared 6.12%% to €35.47 in electronic trading in Frankfurt as the DAX index fell 0.01% at 11.15 local time Tuesday. Engie shares were down 0.48%