Like many of the Caribbean island nations, the Dominican Republic has a diversified power grid that includes solar, wind, hydroelectric, biomass, natural gas, coal, and petroleum sources of electricity.
Unfortunately for both locals and travelers, the electrical grid is outdated and in need of serious improvements. Due to high operating costs and an ongoing electrical crisis, the power sector in the DR has been a bottleneck to economic growth for years. The country is currently working to improve its power system, with plans to construct additional coal-fired plants and hydroelectric dams, but it could take some time before they are complete.
Power outages are a frequent occurrence in much of the country, especially in remote areas. Fortunately for most tourists, all of the larger resorts and hotels use generators to supply electricity in the event of a blackout. That said, if you plan to travel around the country and visit remote areas, you should definitely prepare yourself to be self-sufficient during a power outage. I recommend that all travelers carry a headlamp, power bank, and portable solar panel outside the large resorts.