Tesla has officially launched Vehicle-To-Load (V2L) capability for all Model Y Premium trims in the U.S.
This means that you can now use your vehicle’s battery and the Tesla Outlet Adapter to power other devices and appliances including space heaters, power tools, camping gear, fans, etc, with Tesla's $80 Outlet Adapter.
It's also now live on Tesla's online vehicle configurator (second pic below), and it lets you select the adapter during the config process. Since there is no "only Model Ys produced as of" date listed for the capability, presumably all Premium Model Ys have this V2L capability, but I will let you know if I hear anything different.
Outlet Adapter Specs:
• 120V, 20A
• 2.4kW max power
• Gen 3 Mobile connector required