Currently the stats for grid resources include production, demand, stored, and surplus/deficit, with the latter being the primary stat displayed. This leaves out some important information. Exactly which information depends on the resource in question.
Power: Not every power deficit is a cause for worry. If you have enough in storage, a deficit in the middle of the night, while one's solar panels are off, is more of a distraction rather than something that needs attention. However, whether or not a deficit is a problem depends on the total output of power storages, a stat which is currently not displayed in the game, but which you can work out if you count the number and types of batteries in your colony. Alternatively, it would be good to know the total distribution capacity, which is surplus + total output (of batteries with reserves of power). Arguably this stat is even more important than surplus, and should be the one displayed on the main screen, but whether or not that's so, it's still a very useful stat which should be easily accessible.
Water: water production works a little differently to power, because water production is always capped at water demand so that deposits don't go to waste. However, this means that water production minus consumption is not a very useful stat. Of course you need to know that you're not in deficit, but other than that it doesn't tell you very much. For example, if you want to build a new dome or plant a crop with high water usage, you don't know whether you have the capacity for that. To find out you currently need to click on all of your water extractors to find out how much unused production they have. So... we need to have easy access to total production capacity. Additionally, like with power, we need to have access to total distribution capacity, particularly when anticipating a dust storm or dust devil. In the case of water, however, total distribution capacity is not surplus + total output of storages, like it is for power. Instead water distribution capacity = production capacity + total output of storages. Again, I think it would be more useful to display the total distribution capacity on the main screen instead of surplus / deficit, but whether or not I'm right about that, it's still a very useful stat which should be easily accessible.
Oxygen: This one is the least complicated of the three, but it would still be good to know the total output and / or total distribution capacity.