Ключевые слова: burg tzschocha, castle czocha, castle czocha poland, czocha, czocha castle, elektrownia lena, gry izerskie, hydroelectric dam, hydroelectric power stations, hydroelectricity, hydropower, izerskie mountain, lena, lower silesia, lower silesia voivodeskip, medieval castle, poland, poland castle, polish castle, small hydro, small hydro lesna, water power, zamek, zamek czocha,