The correct answer is option 'A': Pravara Project and Koyna Project.

Explanation:
The state of Maharashtra in India has implemented several river projects to harness the hydroelectric potential of its rivers and provide electricity to industries. Among these projects, the Pravara Project and the Koyna Project are two significant ones that contribute to the hydroelectricity generation in Maharashtra.

Pravara Project:
- The Pravara River project is located in the Ahmednagar district of Maharashtra.
- It is a multipurpose project that aims to provide irrigation, drinking water, and hydroelectricity.
- The project includes the construction of the Pravara Dam, which creates a reservoir for storing water.
- The stored water is utilized for irrigation, and the release of water from the dam is used to generate hydroelectricity.
- The Pravara hydroelectric power station has an installed capacity of 24 MW and contributes to the industrial electricity requirements of Maharashtra.

Koyna Project:
- The Koyna River project is situated in the Satara district of Maharashtra.
- It is one of the largest hydroelectric projects in India and plays a crucial role in Maharashtra's power generation.
- The project includes the construction of the Koyna Dam, which forms the Koyna Reservoir, one of the largest reservoirs in Maharashtra.
- The dam's stored water is released at a controlled rate through the powerhouses to generate electricity.
- The Koyna hydroelectric power station has an installed capacity of 1,920 MW, making it a major source of hydroelectricity for Maharashtra's industries.

Significance:
- The Pravara and Koyna projects significantly contribute to the hydroelectric power generation in Maharashtra.
- The electricity generated from these projects is utilized by various industries, including manufacturing, agriculture, and services.
- This availability of hydroelectric power helps in the growth and development of industries in Maharashtra, providing a reliable and sustainable source of energy.

In conclusion, the Pravara Project and Koyna Project are two river projects in Maharashtra that provide hydroelectricity to the industries in the state. These projects have been instrumental in meeting the industrial electricity requirements and supporting the economic development of Maharashtra.

Answer:
The river projects that provide hydroelectricity to the industries of Maharashtra are the Pravara Project and Koyna Project.
Pravara Project:
- Located in Ahmednagar district of Maharashtra.
- It harnesses the water of the Pravara River.
- Provides hydroelectric power to industries in the region.
Koyna Project:
- Located in Satara district of Maharashtra.
- Utilizes the water of the Koyna River.
- One of the largest hydroelectric projects in India.
- Supplies electricity to various industries in Maharashtra.
These two river projects play a crucial role in meeting the power requirements of industries in Maharashtra. The Pravara Project and Koyna Project contribute significantly to the state's hydroelectric power generation and help in promoting industrial growth and development.