English to Russian Social Sciences Energy / Power Generation

Доклад о возобновл. источниках энергии.

To make sure that building regulations also promote district energy supply, it is important that policy makers and regulators at the national and local levels take an energy system perspective and not just focus on a single building.
...
Final energy consumption measured at the building level does not take wider efficiency gains on an energy system level into account.
Using primary energy (as an assessment thereof) also considers efficiency improvements found, for example, in the production part, where DHC plants improve energy system efficiency.

Во фразе "as an assessment thereof" не совсем понимаю, к чему относится "thereof".

Спасибо.