Sonnedix said on August 3 it closed a €730 million ($841 million) financing package secured against a portfolio of operating solar PV and battery storage assets across Italy, Spain, Portugal and France. The syndicate spans nine lenders: AIB, Crédit Agricole CIB, CIBC, ING, Intesa Sanpaolo, Sabadell, Santander CIB, Société Générale, and UniCredit. Roughly 540 MW of operating PV sit inside the collateral pool, alongside two battery energy storage assets. Italy alone contributes more than 350 MW of the PV base.
Proceeds refinance existing debt, fund optimization work on operating sites, and cover construction of new PV and battery projects in the four markets. CEO Axel Thiemann framed the transaction as a step in the company’s push to scale storage across Europe, following its recent battery portfolio acquisition in Italy. Sonnedix runs a 12 GW total platform: 4 GW operating, more than 1 GW under construction, and roughly 6 GW in development across nine countries.
Why this matters
Three signals sit inside the transaction, and they matter beyond the specific portfolio.
Bank appetite is back. A nine-lender consortium at this size for a mid-market renewables platform is a marker that European project-finance banks have re-underwritten the risk they pulled back from during the 2023-24 lithium-price crash and rate shock. That the syndicate spans both the major eurozone banks and the pan-European coverage banks means pricing was competitive enough to justify wide participation, which typically implies debt terms tightened rather than loosened.
Storage is inside the collateral pool, not a rider. The specific mention of two BESS assets inside a portfolio historically dominated by PV is the more structurally interesting piece. A year ago most European solar refinancings ring-fenced BESS as a separate, more expensive tranche because lenders wanted to price the merchant-revenue exposure independently. Rolling storage inside the same secured pool suggests lenders now treat co-located storage cash flows as sufficiently underwritten by capacity-market and ancillary-services frameworks to sit alongside contracted PV revenue.
Italy is the anchor. With 350+ MW concentrated there, the deal reinforces that Italian storage economics, driven largely by the MACSE capacity mechanism, are pulling capital in ahead of most other EU markets. That has knock-on implications for battery-cell offtake demand in the Mediterranean corridor over 2027-28.
What to watch
Whether US project-finance syndication follows the same “storage-inside-the-pool” pattern in the second half of the year is the tell. So far, US utility-scale solar-plus-storage refinancings have kept battery tranches structurally separate, in part because the FEOC material-assistance rules under IRS Notice 2026-15 have left lenders wary of underwriting battery-cell supply chains without more clarity. If domestic financings start bundling BESS the way this Sonnedix deal did, that would indicate US lenders have gotten comfortable with FEOC-compliant sourcing paths. If they don’t, it points to a widening cost-of-capital gap between EU and US storage build-out through 2027.