Question: where does puerto rico's power come from
[{'answer': 'Puerto Rico Electric Power Authority', 'provenance': [{'wikipedia_id': '32185894', 'title': 'Puerto Rico Electric Power Authority', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 36, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Puerto Rico Electric Power Authority ( PREPA )'}, {'provenance': [{'wikipedia_id': '32185894', 'title': 'Puerto Rico Electric Power Authority', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 656, 'bleu_score': 0.9802931511945101, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 535766606734962866}, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '32185894', 'title': 'Puerto Rico Electric Power Authority', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 0, 'bleu_score': 1.0, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 535766606734962866}, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '32185894', 'title': 'Puerto Rico Electric Power Authority', 'section': 'Section::::Structure.:Subsidiaries.\n', 'start_paragraph_id': 25, 'end_paragraph_id': 25, 'meta': {'evidence_span': ['PREPA serves close to 1.5 million customers through several power plants: Puerto Rico has 21 hydroelectric plants.', 'June 11, 2018 after governor Ricardo Rossello. PREPA serves close to 1.5 million customers through several power plants:', 'Puerto Rico has 21 hydroelectric plants.']}}]}]