International students must submit TOEFL or IELTS scores from the past two years to demonstrate language proficiency. To be eligible for admission, applicants must score at least a 100 on the TOEFL (send to institutional code C527), or 7.0 on the IELTS (e-deliver score results to Northwestern University - Master in Energy & Sustainability). Note that this requirement may be waived if undergraduate coursework was taught in English. In this case, the student's transcripts must clearly state English as the language of instructions or must secure a letter from their degree program stating that English was the language of instruction.