No. There always needs to be a load to balance out the power generation on the grid. Ideally, when there is excess generation, load (that is, work) can be added in some form of battery for later useful discharge, like: charging a battery, pumping water up a hill, spinning flywheels faster, etc. In one interesting example, some large industrial users that operate big freezers will take the freezer temp much lower when there is excess generation (i.e. the freezer needs to be below 0F, but it will go way below that when energy is cheap).