[kvvic]

Then I'll throw out "solving problems of". This won't change the meaning and the sentence will be a little bit easier to read, I hope.

Development and improvement of technologies for producing novel materials and methods for their protection are vital prerequisites when ensuring reliability and high efficiency of stationary or vehicular power plants, as well as creating new-generation engines.

...ensuring [zero article] reliability and high efficiency...
Could you please explain it to me? There're no articles in my mother tongue and so I don't always use them properly. I thought ...the reliability and high efficiency... would mean the degree of reliability and the level of efficiency that are required of the power plants.