Although I question how many homes are actually as well-insulated as you claim, you're right – heating demand doesn't have diurnal cycles of much significance.

Although I question how many homes are actually as well-insulated as you claim, you're right – heating demand doesn't have diurnal cycles of much significance. Diurnal "peakiness" isn't the issue at hand here, though. It's less predictable outliers in demand (e.g cold snaps) that can strain the grid's capacity to the point of failure. It seems like the point he's trying to make is that meeting unpredictable and dynamic energy demand is a tougher problem to solve at scale with electricity than with gas. As other folks here have pointed out, he largely ignores the actual practical reality of distributing gas, though, which undermines a lot of this whole point anyway.