People on day/night plans aren't the primary targets though.Anyway, surely the best way to do that is by revising the pricing structure in such a way as to encourage (or drive) consumers towards smart packages. As a day/night electricity consumer for the past 40 years I have no intention of becoming "smart" (sic) until the calculations make it worth my while - and the evidence is that many consumers feel exactly the same way.
The smart plans already make sense for a lot of people. On the average usage rates, the smart plans are close in price overall to the standard 24 hour tariffs. Even based on my own numbers, I'm not far off the point where a smart plan would save me money and I work from home. Have you done the calculations on your own usage and if so, how are you measuring use during peak time?