There is limited centralized data about solar generation in Alaska. This is due largely to the distributed nature of this generation technology in the market. Alaska Energy Authority and the Alaska Center for Energy and Power both collect data on solar installed capacity around the state, but datasets are unlikely to ever be comprehensive.
National Solar Radiation Database
The PVWatts™ tool is an estimate of solar energy potential at any given location across the United States. Users should bear in mind that it is only an estimate and actual solar PV or solar thermal system performance will vary based on your exact site configuration and year-to-year variability of sunshine. AEA advises using this tool as a high-level best-case estimator for system production.
More information about the PVWatts™ Viewer can be found at https://pvwatts.nrel.gov/