However You Want
As far as we're aware, hyperspace isn't a real thing. It's a handy evasion of the cosmic speed limit for narrative purposes.
So its properties are whatever the author (in this case, you) want them to be. Do you want it to destroy the planet? Go for it, though that gives anyone who knows how to make a hyperspace engine a weapon of mass destruction. It could just as easily be completely harmless, unless you're looking directly at the hyperspace portal when it opens, in which case you instantly go mad.
Any further speculation would just be opinion-based, so I'll leave you to come up with what your hyperspace does.
In light of comment, I'll clarify: hyperspace is also not a theoretical thing. It is purely fictional, so asking questions about it requires that its parameters (what its portals do, how one travels through it, and how much energy is required to reach it) be defined.
As an example, hyperspace in Star Wars is an alternate dimension accessible by "breaking the speed of light", while hyperspace in Star Control II is an alternate dimension reachable by hyperspace field generators and can be reached while stationary. The properties of the dimension are different, with the only real commonality being that they are coterminous with "realspace".