In the letter, they spell out the new rates - they apply to all new electronic meters. They also present a nifty little graph to show the difference between the peak, off-peak and "shoulder" rates. It looks like this:
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The graph is not very informative in terms of rates as the vertical axis is not labelled - you have to read the table over the page to find the actual rates. The clear implication is that peak rates are roughly double off-peak rates with shoulder rates somewhere in between.
Thanks to trusty Photoshop, here's what the graph would look like with actual rates on it:
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The vertical axis is in cents per kWh - peak power is roughly 500% dearer than off-peak, and about 270% dearer than shoulder rates. A classic case of spin if I ever saw one - never trust a graph with missing labels.
I wish I had known about the new rates when we were planning our house - I stupidly assumed that they would be fairly similar to the old rates. If we had known about this, it would have given me an excuse to opt for a bottled-gas powered cooktop instead of the electric model.
The last part of the EA letter says
All true, but it's terribly inconvenient to postpone cooking dinner till after 8pm.