Agreed, if you make it in the console then screen readers can already access it.
That said, if you are willing to put more thought and effort into it, then you can provide a better experience by creating a custom interface.
For instance you can allow players to move around your grid of tiles using the arrow keys, which is a little nicer than the console since a screen reader is designed for reading text in the console, not navigating a grid of tiles.
Tolk is a good library to use for outputting to screen readers, and it is not hard to setup.
If you have any troubles with it feel free to contact me and we can setup a quick skype call.

For an example of a game that represents terrain and units on a grid to players you can try Tactical Battle written by me.
Or check out Castaways written by Aprone.
Both are free and have some limited graphics so you can easily compare what you are seeing visually with what is being output to the screen reader / TTS.

Edit: A game called Time of Conflict by GMA games also uses grids, but goes beyond the previous 2 examples by having lists of nearby units and some other nifty tricks to help players get a sense of what is around the focused tile.
It is a paid game, but I think it still has a demo.
I've never played it myself, had some screen reader issue when I tried the demo years ago, but I've heard from players of Tactical Battle that he put some real thought into helping players get a better sense of their surroundings.
Researching what existing audio games already do for interfaces can save you a lot of time by not needing to reinvent the wheel.

Hope this helps.