Tales of BESS #14 - SPECIAL - Co-Located Asset : PV + BESS – Impact on Budget forecast​

The site is operated by the Technical Asset Management team of Greensolver on the behalf of the Asset owner. The site is 8MWp + 4MW/4MWh located in France.

As part of the TAM scope of services, Greensolver team is leading regular Analysis to compare Actual Performance to the Budget forecasts generated by the PV part. ​

For this example located in France, the EYA carried out to serve as reference for the PV revenue forecasts did not consider the Curtailment periods generated by the BESS part.​

Indeed, within a co-located Asset, Grid substation is shared between PV production and BESS export/import dispatch. BESS usage can lead to important Revenue impacts for the PV part.​

When BESS delivers Ancillary Services (AS=FCR, aFRR or mFRR) to the Grid, the TSO obliges to curtail the PV production to the Max Exportable Capacity minus the Max Capacity awarded for delivring the AS. ​

For instance if your site can Export 8 MW of PV and the BESS deliver AS to 4 MW, the PV part is curtailed to 4MW, reducing by 50% the revenue generated by the PV part.​

Greensolver can both bring you support during the Development phase to ensure a robust EYA considering the BESS curtailment impacts and during the Operation phase by monitoring the Performance to the Budget.

Written by Léo Chalon