Here are the details:
Visit us at Toronto-area Walmart and Sears stores or select Canadian Tire and Staples stores during the last two weekends in October to receive a free power bar.
You must be a Toronto Hydro customer on Time-of-Use rates.
To be eligible, bring your original 2010 August or September Toronto Hydro bill to an event.
You'll be required to complete a short survey
One power bar per electricity bill / household.
First 500 customers, while supplies last (500 power bars available at each event, each day).
Visit participating retailers on:
Saturday, October 23, 2010 from 10 a.m.
Sunday, October 24, 2010 from 11 a.m.
Saturday, October 30, 2010 from 10 a.m.
Sunday, October 31, 2010 from 11 a.m.

For a list of all retailers check this link:

Beat the Peak Event Schedule | Toronto Hydro Electric System