Because the specific design and configuration of solar power plants vary from region to region and project to project, an accurate standard answer cannot be provided. However, I can give a rough reference range.

A megawatt (1 MW) solar power plant typically requires an area of about 1 to 5 acres (0.4 to 2 hectares). This range can be affected by a number of factors, including:

1. Efficiency of solar panels: Efficient solar panels can produce more electricity on a smaller area, thus reducing the area required.

2. Light conditions: Light intensity and sunshine time have a direct impact on the output of solar power generation. In lower light conditions, a larger area may be required to obtain the required power generation.

3. Mounting systems: The design and layout of different solar mounting systems, such as fixed tilt or tracking systems, also affect the area required.

4. Terrain and space utilization: The degree of relief of the terrain and the limitations of available space also affect the installation area requirements.

Therefore, when planning a one megawatt solar power plant, a detailed engineering and design analysis is required to determine the specific area requirements. Professional solar engineers and design teams can provide accurate area assessments and planning recommendations based on site conditions and project requirements.