Simplify the following text for a Grade 9 native English-speaking person.
Original: When fully operational in 2011 , the proposed Mojave Solar Park will have an installed capacity of 553 megawatts of solar power , calculated to power 400,000 homes , to PG&E â s customers in northern and central California .
Simplified: The Mojave Solar Park will deliver 553 MW of solar thermal power when fully operational in 2011 .