Building the business case for co-located BESS  ess-news.com

mc Advisory modeled a 4 MWp German solar project with 4 MWh or 8 MWh batteries, comparing solar-only, co-located “Green” batteries charged only by solar, and “Gray” batteries that can also charge from the grid. The analysis found storage raised annual revenues by up to €315,000 before ancillary services; adding aFRR up revenues lifted the 8 MWh Gray case to €835,000 a year, highlighting the trade-offs among battery size, EEG support and market participation.