The Refinadora Costarricense de Petróleo has installed 160 solar panels on the sprawling dining hall on the refinery grounds in Moín.
The petroleum monopoly spent $113,281 with the firm Elvatron S.A. for the job. On a sunny day the panels will generate 40 kilowatts of power, said the refinery. All of the power generated will be used there, it added.
The refinery has two other solar installations on the site, and together they generate 91 kilowatts in sunny weather, it said.
The company, known as RECOPE, pays for electricity at a higher rate than homeowners because it is a commercial installation.
The firm said part of the reason for installing the panels was to mitigate climate change.