The company, earlier known as Moser Baer Projects, would be making the investments across solar, thermal and hydro projects in three years.
Hindustan Powerprojects Chairman Ratul Puri said the cumulative investment in the projects would be "about Rs 31,000 to 32,000 crore".
"This (investments) would be for little over 5,000 MW generation capacity, may be 5,200 or 5,300 MW," he told PTI in an interview here.
Two thermal projects - in Madhya Pradesh and Chattisgarh - with a total capacity of nearly 4,000 MW, are already in the works.
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Currently, the company has an operational capacity of about 350 MW and 77.5 MW of solar power is expected to be commissioned by June.
Of the total existing capacity, around 120 MW of solar assets are outside the country. These projects are in Germany, Italy and the United Kingdom.
Puri said the company has invested about Rs 14,500 crore in three years.
"Our asset base in 2010 was about Rs 500 to 600 crore. Today the balance sheet size is around Rs 14,500 crore," he added.
He said: "It is important for businesses to see free cash. We have invested about Rs 5,500 crore into solar (projects) and that is generating a significant amount of free cash flows."
The domestic power sector has been facing challenging times of late, especially on account of fuel shortages and poor financial health of electricity distribution companies.