SDM120C energy monitor https://thingspeak.com/apps/plugins/14346 https://thingspeak.com/apps/plugins/129446 https://thingspeak.com/apps/plugins/129648
Power Consumption Meter based of Openenrgy Monitor Arduino Libraries and CT Current Transducers.
GAHE GHDS100E Energy Meter is equipped with RS485 Communication. Readings are retrieved by ESP8266 (Wemos Mini) running Modbus RTU library, then send the data directly to Thingspeak every 15 seconds.
Readings from a PowerBlade power meter through an ESP32 BLE Gateway