Zámecký mlýn U Čtrnácti in Jindřichův Hradec is a historic water mill and power plant that highlights the region's rich industrial heritage. Situated between the castle and brewery on Hamerský potok, this monument has been protected since it became part of the national heritage site Zámek Jindřichův Hradec. Its history dates back to the 15th century, with significant expansions in the 16th century by Jáchym z Hradce and a transformation into a hydroelectric power plant at the end of the 19th century by František Křižík.

The origins of Zámecký mlýn U Čtrnácti trace back to the 15th century when it was first documented as a mill owned by Ondřej. It quickly changed hands, being sold to Ambrož shortly after. The mill's significance grew in 1551 when Jáchym z Hradce expanded and reconstructed it, marking his contribution with a coat of arms alongside that of his wife Anna z Rožmberka. This period was marked by the Luxembourg dynasty's rule over Bohemia, setting the stage for the mill's development amidst significant political and religious changes leading up to the Hussite Wars.

Architecturally, Zámecký mlýn U Čtrnácti has undergone several phases of development. Initially constructed in the 15th century, it saw major expansions and reconstructions in the 16th and 19th centuries. The late 19th-century transformation into a hydroelectric power plant by František Křižík introduced modern Francis turbines to its structure, marking a significant technological advancement.

Ownership of the mill has seen dramatic changes over the centuries. After its initial ownership by Ondřej and Ambrož in the 15th century, it was expanded by Jáchym z Hradce in 1551. The mill faced destruction twice due to fires in 1615 and 1773 but was rebuilt each time. In 1853, it underwent reconstruction under the design of Ing. Gustav Hannak. By the late 19th century, it became part of Velkostatku hraběte Eugena Czernina before being modernized into an electric power plant.

Key events in the mill's history include its expansion and reconstruction by Jáchym z Hradce in 1551, destruction in fires at the Jesuit seminary in 1615 and during a castle fire in 1773, and its reconstruction under Ing. Gustav Hannak's design in 1853. The transformation into a hydroelectric power plant by František Křižík marked a pivotal moment, making it one of the first in the region.

Today, Zámecký mlýn U Čtrnácti remains functional and continues to supply electricity through its connection with EON's distribution network. It houses a museum that offers insights into the history of electricity, fishing, and forestry, providing visitors with a unique glimpse into the past. The mill's location near Jindřichův Hradec Castle and brewery adds to its appeal, making it a worthwhile destination for those interested in exploring the cultural and historical landscape of the area.

Zámecký mlýn U Čtrnácti stands as a remarkable example of industrial evolution and heritage preservation. Its journey from a simple mill to a pioneering hydroelectric power plant reflects broader technological and societal shifts over centuries. Visitors are invited to explore this historic site, where past innovations continue to illuminate the present.