Tata Power is to acquire Welspun Renewables for an enterprise value of Indian rupees (INR) 92.49 billion.
Tata Power indicated that it intends to maintain leverage at the current improved levels post-acquisition through strategic measures.
If the acquisition is fully debt funded, Tata Power's debt will increase by about 25 per cent.
"We believe Tata Power will share further details on its capital structure in due course. Tata Power's operating performance in the fiscal year ended March 2016 wasabove our expectations," said S&P.
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The company's ratio of funds from operations to debt was stronger at about 12 per cent for the fiscal year ended March 2016, against S&P's expectation of about 9 per cent.
"In our view, Tata Power's business position is unlikely to be materially changed after the acquisition. The company will likely emerge as one of the larger renewable energy players in India but, overall, renewable energy accounts for less than 30 per cent of India's power generation," said S&P in a statement.
"We believe Tata Power will need to manage its liquidity appropriately as the planned short-term bridge facility could accentuate the pressure from high short-term debt and continuing covenant breach at the Mundra project.
"However, Tata Power has satisfactory banking relationships and access to support from its promoters if required," he observed.