The reigning Formula E champion took victory by more than 13 seconds in the first of two races in Saudi Arabia, but never featured in the sequel.
This was after the Andretti driver failed to make it through his qualifying group when a red flag was deployed on his final effort and he was forced to start 14th for the 36-lap race in Diriyah.
Despite having strong pace the Briton failed to make progress, and was eventually being classified outside the points with a lack of one-lap pace a growing concern.
“The red flag didn’t ruin our weekend to be honest, we weren’t making the duels even if I finished that lap, that wasn’t the issue,” Dennis told Autosport.
“Just pure pace over one lap was nowhere, but we proved in the race that we were quick again.
“Fastest lap and definitely one of the quickest cars in the race, but just no pace over one lap.
“It’s becoming a bit of a trend, sometimes we can drag a lap out of it and get it into the top five but it’s a real difficult task.”
Source: Autosport