Ethanolamine-phosphate cytidylyltransferase that catalyzes the second step in the synthesis of phosphatidylethanolamine (PE) from ethanolamine via the CDP-ethanolamine pathway. CTP + H(+) + phosphoethanolamine = CDP-ethanolamine + diphosphate Phospholipid metabolism; phosphatidylethanolamine biosynthesis; phosphatidylethanolamine from ethanolamine: step 2/3. Belongs to the cytidylyltransferase family.