If photons cannot reach your photovoltaic panels, there will be no solar production. Accumulated snow makes it difficult for photons to reach the panel.
If you live in an area that has net metering, you will be able to use any excess energy credits generated earlier in the year to off-set the usage during these times
Alternatively, if you have battery back-ups, you may be able to use this energy in lieu of incurring charges from the grid.
If you’re really fanatical, you can carefully brush snow off the panels, but that means climbing on your roof in the snow, so BE CAREFUL. (Don’t use a shovel, as you can damage the panels, use a soft-bristle broom.)