The cost in
XXVII Energy Conference EuroPOWER
is:

Price:
2695 PLN + 23% VAT to 6.03.2018
3295 PLN + 23 % VAT from 6.032018

The cost in
Grand Gala Leaders Of The Energy And Manufacturing World
is:

Price:
995 PLN + 23% VAT to 6.03.2018
1495 PLN + 23 % VAT from 6.03.2018