The phrase "is the key solution" is correct and usable in written English.
You can use it when you want to emphasize that a certain solution is the most important one. For example: 'Reducing carbon emissions is the key solution to combatting climate change.'.
At the center is the key solution provider, whose size is variable due to various factors.
So it is obvious that distributing data packets among the discovered multipaths is the key solution.
The main difference between the two technologies is the key solution they provide for the distribution problems: local interaction and mobile logic versus location transparency.
When we worked on the G8 themes we found that education is the key solution to all of our world's problems.
While affordable and stable housing is the key solution to prevent homelessness, in the interim, healthcare and public health practitioners must identify strategies to improve health outcomes in this population.
More recently, Li-ion and other battery-related technologies have been the most convenient form of energy storage and are the key solution to the global energy crisis.
Entrepreneurship skills and attitudes often exist in the nonprofit sectors, but at present, due to changes in business approaches, entrepreneurs are the key solution to financial and non-financial problems of organizations.
Preventive measures taken in the home and, more importantly, increased awareness of this potential risk of injury by the parents are the key solutions to this problem.
Improving workforce performance, availability of essential commodities, and well-integrated health service delivery were the key solutions proposed.
The robot is the key to his solution.
This dilemma is the key challenge whose solution will be the catalyst for China's aggressive growth and future status as a world power.
