2.58MW Solar Pile Ground Mounting System have been done in Japan
Here is the project picture:

MG Solar Pile Ground Mount Solar Structure System is one kind of driven-pile system, servicing for large-scale MW solar farms.
Features
1. Suitable for different regions, such as low-cost concretes and high wind and heavy snow regions.
2. Ground screw foundation and concrete foundation can be acceptable
3. Parts have been high pre-assembly on factory to save your installation time
4. Simple and fast installation
5. High quality galvanized steel material