Challenge and objective

  • Simultaneous activation of flexibility from thermal loads can cause adverse rebounds later.
  • DSO must be aware of such impacts.
  • This work propose parameters for flexibility activation from electric water heaters (EWHs) are proposed and flexibility potentials are computed for Norway.

Work performed

  • Maximum flexibility activation time calculation method is suggested.
  • Uncoordinated flexibility activation impact is characterized.
  • Simple rebound reduction technique is proposed and compared with blind activation.

Significant results

  • Highest average flexible power potential is 54% at 8:00 a.m. for a duration of 1 h.
  • EWHs can serve as FCR at peak hours with high ramp-up and ramp-down rates of 48.5% and 23.8% per minute and as FRR during non-peak hours.

Impact for distribution system innovation

  • DSO must have an overview of the impact of flexibility activation on the demand side.
EWH rebound characteristics
EWH rebound characteristics

Magnus Korpås

WP3 Lead
+47 970 42 009
Magnus Korpås
WP3 Lead


Reference in CINELDI