Over 90% of industrial roofs in Germany lie idle—yet they hold more than 33 GW of untapped solar potential. This guide explains the actual costs and benefits of a PV system on your industrial roof, as well as the regulatory considerations for 2026.

In concrete terms, PV investment costs in 2026 mean: module prices at historic lows coincide with a regulatory window for the energy transition that closes in 2027 with the EEG reform. Turnkey rooftop systems cost €800–1,500/kWp depending on the system type, ground-mounted systems cost €600–1,000/kWp — and the investment deduction (IAB) under Section 7g of the German Income Tax Act (EStG) lowers the entry barrier by up to 50% of the net acquisition costs before the photovoltaic system even generates any electricity.

What will be the return on investment for commercial and industrial solar power systems in 2026—and when will the investment pay for itself? Three detailed scenarios show the actual returns for a manufacturing facility, a logistics center, and an open-space solar power system with direct sales—including all costs, factors that reduce returns, and the key difference between self-consumption and feeding electricity into the grid.