The adoption of solar panels by the flower bulb industry increased spectacularly from 5% of the companies in 2013 to 42% in 2019. As from 2023 the favourable conditions for return of energy will be phased out gradually, WUR investigated how surplus production of electricity could be stored profitably. On tulip farms electricity use peaks in July to September, but solar panels produce a surplus in April to June, on lily farms it peaks in November to February and surplus occurs from April to September. For both farm types the daily surplus suffices to cover the nightly average electricity use (from 200 – 300 kWh). Storage in container batteries (20 – 40 ft) with efficiency > 95% is suitable. For long time storage of the average remaining surplus of 12.000 kWh on tulip farms and 50.000 kWh on lily farms, container batteries are not suitable, e.g. the latter requires 25 containers. Storage of the remaining surplus through hydrogen production with an electrolyser and converting back to electricity with a fuel cell has a to low efficiency (35%) and production scale is too small. It is recommended to store surplus electricity for nightly use only, and return the surplus to the grid.
|Name||Rapport / Stichting Wageningen Research, Wageningen Plant Research, Business unit Glastuinbouw - Bollen|