Grid capacity in Hungary and Romania is filling fast and the development window for well-positioned projects is narrowing. Solar has driven the majority of new capacity in both markets since 2015, but rapid build-out is now creating structural bottlenecks: connection queues of 3–5 years, tightening transmission headroom, and increasing geographic concentration risk. This report maps where grid headroom still exists, which revenue frameworks are replacing legacy subsidies, and where actionable projects are in the market right now. Three screened Romanian opportunities are profiled in full, with grid status, development stage, and entry mechanics.