Puerto Rico’s governor has pledged to improve the island’s crumbling electric grid and boost the economy in her first address after being elected as anger intensifies over chronic power outages and an increase in cost-of-living expenses.

The two parties that have dominated Puerto Rican politics for decades are losing their grip as they face the stiffest competition yet from a younger generation fed up with the island’s corruption, chronic power outages and mismanagement of public funds.