Explains why household appliances increasingly need to communicate with each other as the supply side becomes variable (sun and wind) and the grid becomes decentralised. Starts with the simplest form, local control on the device itself (e.g. PV inverter voltage curtailment), then local control with external measurements (an EV charger reading the digital meter to soak up surplus solar). Shows why multiple isolated control loops in one home start fighting each other — the 'see-saw with a screen between players'.
Introduces interoperability through open standards, both decentralised (devices aware of each other's intent) and centralised (a HEMS hub coordinating dispatch, including less-controllable loads via their data). Extends beyond the home into energy communities and flexibility via aggregators, and closes with the three concrete benefits: lower CO2 emissions, lower household costs, and a more stable grid.
