The steam-powered electric generator lets you convert steam power into electric power. You can thus combine the Steam Advantage and Power Advantage mods for even grander builds.
The photovoltaic generators (aka "solar panels") are turning sunlight into electricity, which is then stored in the battery array.
The laser defense turret will vaporize those pesky intruders!
Here we see a build that automatically grinds ore into dust (doubling the yield), smelts it into ingots, and then crafts something from the materials in the automated assembler.
The growth camber controller (the thing with the leaf) supplies dirt, water, and power to all contiguous growth chambers. Growth chambers farm plants in an internal inventory.