What would the risk be other than changing the distribution of heat around the planet? The solar power would have heated up the area locally had it not been captured by the panel. This makes the local temp lower while raising the temp at the point the power is used.
Solar panels have a pretty low albedo compared to most surfaces: they will contribute to warming of the planet to some degree because less light gets reflected back into space. It's just much, much less than the warming from fossil fuels for the same amount of energy.
