As Europe’s energy transition advances, developers continue to pursue wind and solar opportunities, but falling capture rates—particularly for solar—are eroding long-term revenue expectations. In response, two strategies are gaining traction: Power Purchase Agreements (PPAs) to diversify financial risk and Battery Energy Storage System (BESS) co-location to mitigate cannibalisation. Each approach is complex to value on its own; combining PPAs with BESS further increases pricing and revenue uncertainty.

While PPA–BESS co-location remains an emerging trend, PPAs are already being signed in increasingly volatile power markets, shaped by uncertain renewable generation, fuel prices, and demand dynamics over long contract tenures. Adding BESS introduces additional valuation variables, including “Green BESS” versus “Gray BESS” constraints and the extent to which storage dispatch supports the PPA delivery profile. The key question is not only whether storage adds value, but how that value is reflected in PPA pricing and revenues.

This case study examines:

• How a co-located “Green BESS” can improve fair value PPA pricing under a pay-as-produced contract in Germany

• The impact of BESS on total revenue and generation over a PPA tenure

• Differences in revenue gains between onshore wind and solar when BESS is added

The analysis is based on the webinar PPA Market Focus: Will 2026 be the year of BESS?, presented on 3 February 2026, which reviewed power market developments, PPA trends, and the role of battery storage in shaping renewable revenues. The full webinar recording with visuals is available via PPA market trends and BESS outlook 2026.