Following her departure from MIT, Telkes worked as a consultant and researcher for various companies and institutions. This allowed her to continue her research into solar energy technologies and to apply her expertise to practical applications.

She continued to refine her designs for solar ovens and water distillers. These devices were particularly useful in developing countries, providing clean water and efficient cooking options in areas where traditional fuels were scarce.

In the 1970s, Telkes worked on thermoelectric devices that could convert solar energy directly into electricity. While these devices were not as efficient as photovoltaic cells, they represented another innovative approach to harnessing solar power.

Telkes consistently focused on developing solar technologies that were affordable, reliable, and accessible to people in various circumstances, particularly in developing countries. Her commitment to practical solutions underscored her dedication to using solar energy to improve lives.