The typical cost of building a solar power plant is between $0. Rooftop solar systems are. A significant investment in a solar power plant typically ranges from $1 to $4 million per megawatt of installed capacity, dependent on various factors such as location and technology. Costs may include land acquisition, equipment purchases, installation services, and regulatory compliance. As concerns over climate change and energy independence continue to rise, the focus on renewable energy sources such as solar power becomes critical. In 2024, cumulative solar PV capacity reached some 886 gigawatts in China alone.