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Bob launches the smart grid application and views the daily consumption for today (March 12th)
Looking at the graph he notices that his energy consumption was extremely high between 12pm and 3pm.

Pros:
The application provides an intuitive way to view the daily consumption. The graph makes it easy to see the power consumption throughout the day. 

The application presents the user with the option to view the monthly and yearly consumption by clicking the tabs on the bottom of the screen. In addition, the user can view the consumption for a specific device by clicking the device drop down list and selecting the device. These features are easily accessible to the user and the user is not required to click through different screens to discover these features.

Most of the features the application provides are presented to the user, enabling the user to easily explore and discover the various features the application offers.

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There is no way to overlay the consumption pattens of multiple devices, which would enable the user to easily compare the consumption patterns of different devices.

New users may be overwhelmed and confused by all the features presented on this main screen.

New users are more likely to misinterpret the data presented by the graph, not knowing that the different tabs enable them to view different data. 

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The tabs enable the user to view consumption patterns and pricing information for different devices on different dates. The user can easily access these features without having to click too many buttons or menus.

The user can easily access most of the features of the application without having to go to different screens. The user has quick access to most of the features.

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Since there is no way to overlay the consumption patterns of multiple devices, the user would have to work hard to compare the usage or consumption patterns of different devices.

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  There is no way to make data-related errors on the main screen.

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The different tabs allow the user to change the display different data. Since the tabs change the mode of the displayed data, the user can easily make mode errors, such as viewing the information of the wrong device. The ability to view different types of information for different devices with a single click, makes them more likely to forget which mode they are on.

There is no way to undo view actions, such as tab change.

Bob clicks the device list, which lists the available devices sorted by their energy consumption on march 12th, where the top item is the highest consumer. He selects the first item on the list, A/C1, which is one of the air-conditioning systems in his house.

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The graph changes, displaying the total consumption for A/C1 on March 12.
Looking at the graph, Bob learns that A/C consumes a lot of power in the afternoon.

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To see whether the additional power use is costing him much money, Bob looks at the current price information being provided by the grid by clicking the Pricing Info tab. He finds that it is a peak usage time and that prices are high.

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Bob decides to change the conditioner's set point. He clicks the "Config Device" button to edit the settings of A/C1. A/C1's settings screen enables Bob to edit the set point.
Bob increases the set point from 75 degrees to 80 degrees and clicks the OK button.

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Bob checks the status of his solar panels, by clicking the device list and selecting the Solar Panels option.
 

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Bob checks the generated power information by clicking the Power tab below the graph. The app displays a graph showing information about the power generated by the solar panels. He decides to sell some power back to the utility company, so he clicks the Sell Power button.
 

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The app displays the Sell Power screen, showing a list of all the future transactions scheduled to sell extra power generated by the solar panels.
Bob creates an additional transaction by clicking the +add button. 
 

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The app displays a dialog that enables Bob to schedule the transaction. Bob creates a transaction scheduled to take place at 4pm (an hour into the future). He sets the start and end time by clicking the time fields and setting the time. Then he saves the transaction by clicking the OK button and closes the application.
 

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Critics to the overall design

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