The first impression is that the translator didn't really knew the corresponding Hungarian technical expressions (and was guessing).

Bingo, same impression as the French version gave me. Whereas the Eng-lang questionnaire echoes the Eng-lang Green Paper, the French questionnaire didn't make use of the competent GP translation...

Q4 : I take "competitive" to mean "competition-based", rather than "in competition with one another". But the word is thrown around loosely by the GP drafters:

A truly competitive single European electricity and gas market would bring down prices, improve security of supply, and boost competitiveness. (p.5)

(Exploding heads please queue up, the nurse will see you shortly).

"Cost-effective" is important, it's really the core of that response: only do energy savings that come through cost-effectiveness studies well. (Imagine wizened gnomes in mountain hideout counting piles of ancient coins while outside the planet roasts).