Renewable Watch

Renewable Watch

"Renewable Watch" or "REWatch" display is updated throughout the day and shows system information as well as wind and solar production. The graph on the bottom right shows system information for prior day conditions compared to current day conditions. It illustrates how different the net system load served by the utility can change throughout the day with changing levels of Photovoltaic (PV) generation and wind generation.

  • Solar irradiance measures the solar resource potential in Watts per meter square (W/m2) available for PV production for different regions. Like wind turbines, PV panels need a certain irradiance level before they can generate electricity.
    • Orange line: West Oahu
    • Pink line: South Oahu
    • Yellow line: Central Oahu
    • Red line: East Oahu
    • North Oahu will be coming soon
  • The green line measures the wind energy production from wind facilities on Oahu.
  • The blue line represents the net system load, which is the amount of energy met by utility generation.
  • The light blue line is the gross system load, which is the total demand, or the total amount of electricity used by customers, on the system. This demand is met by a combination of what is served by the utility and what is provided by local distributed systems, such as PV on rooftops.
  • The difference between the blue and light blue lines represents the estimated aggregated distributed generation produced by local PV generation. This estimate provides a good estimate of how much energy is being produced by rooftop PV systems without our having to meter every rooftop PV system. This perspective provided operations and planning personnel with the information to gauge the impact of rooftop PV on system load and helped explain the decrease in mid-day load.