Build many many solar sats to get your total energy to the needed level,
There are plenty of ways to make the process easier, for example a hot planet would produce more energy per satellite requiring you to build less,
and you could use
Zorg Tools to calculate the needed resources.
It's usually a good idea to go for level 2 at the same time, this can be done with a high level nanite building to up the production speed.
Once you have completed it, get a friend to attack the planet to remove the sats, as they are a healthy source of crystal for other players.