What is the Islamic ruling on working for an electricity company that sells its products to mosques and liquor stores?

If your work in this company is not connected to marketing its products for use in unlawful purposes, then there is no objection to it, although seeking another job would be better. However, if you directly market these products to places that propagate evil and assist in it, then it is not permissible for you to continue in this work due to its involvement in aiding evil.