As a one-man, one-office business, Polsky himself secured all the power purchase and steam sales agreements upon which Indeck built its success. Within five years, Polsky had built the business into a nationally recognized company with over 100 employees and four plants in operation.
Under his leadership, Indeck rose to the top of the independent power producers, earning the rating of one of the 100 fastest-growing companies in the United States by Inc. magazine. In 1990, he founded Polsky Energy (later renamed SkyGen Energy); developed major power plants in Nova Scotia, Wisconsin, and Maine; and quickly became one of the country's most successful power plant developers. After selling SkyGen to Calpin in 2000, Polsky founded Invenergy, a developer and acquirer of power generation, transmission facilities, and industrial energy assets in North America.