After graduating from MIT, Clarke initially faced difficulties finding an engineering position. She returned to GE, working as a 'computer' in the Turbine Engineering Department. This role involved performing complex calculations for turbine design.

Clarke transitioned to a formal engineering role within GE, becoming the first woman employed as an electrical engineer in the company. This was a significant breakthrough, paving the way for other women in the field.

During her time at GE, Clarke specialized in power system analysis, focusing on calculating the parameters for long transmission lines. This was crucial for developing reliable and efficient electrical grids.

Clarke patented the 'Clarke Calculator,' a graphical calculator designed to simplify calculations for solving electrical power transmission problems. This invention greatly improved efficiency and accuracy in power system design.

Clarke travelled extensively throughout the country, primarily presenting at conferences and giving lectures on power transmission, showcasing her expertise and promoting her work. She was a sought-after speaker in her field.

Edith Clarke retired from General Electric in 1945 after a distinguished career of over two decades. However, her contributions to electrical engineering were far from over.