DONE - Area Visualizer: Shows you the area that the controller currently powers.
PARTLY DONE - Area/Building Picker: Lets you choose the area you want the controller to power. Buildings can be picked since 2.12.0, including ones you built. A free-drawn area can't be picked.
DONE - Backup Generator: Convert a generator into an Off-Grid backup: the controller starts it when the batteries run low, and it charges them too. (3.0.0)
DONE - Transformers / Player-built Grids: Placeable transformers or distribution equipment extend controllers' power
reach through a player-built electrical network. (2.12.0)
DONE - Solar Lights: Streetlights / Light Poles with built-in solar panels and batteries. (2.12.0)
DONE - Realistic Mode: A sandbox option that makes panels produce what 1993 panels did, with Alwar's figures. (2.12.0, Suggestions board)
DONE - How rare solar finds are: Sandbox options for how many houses have a solar rig in the yard and how many storage barns hold spare solar gear. 0 turns either off. (2.12.0, Suggestions board)
PLANNED - Foraging for solar components: Slowly find replacement solar components by foraging. (Suggestions board)
PLANNED - Salvage-only building in Realistic Mode: In Realistic Mode, standard and premium panels can only be found, not built; makeshift panels are built from parts salvaged out of damaged ones. (Suggestions board)
PLANNED - Wind Turbines: Turbines that charge your batteries when the wind blows, beside your solar panels or on their own.