Compose an immersive and detailed 8K image encapsulating the essence of a Frostpunk city, centered around its solitary main generator. Visualize the generator as the epicenter of survival in a frozen wasteland, radiating warmth and light across the cityscape. Highlight the architectural elements surrounding the generator, illustrating the city's dependence on this vital source of heat. Emphasize the stark contrast between the intense cold of the surroundings and the comforting glow emanating from the generator. Capture the resilience and unity of the city's inhabitants gathered around this lifeline, conveying their shared struggle for survival. Pay careful attention to the subtle details, such as frost- covered structures and the expressions of determination on the faces of the people, to create a powerful and emotionally resonant image that encapsulates the harsh beauty and challenges of life in the Frostpunk world