Offshore Electricity Infrastructure in Europe - European Wind Energy ...

Annex d – details of results
table 13.4: tested mesh inteRcOnnectORs
case country From name country to name MW Voltage technology Mesh design
h_1 NL IJmuiden Hub 03 DE Gaia Group 1,000 500 HVDC VSC -
h_2 NO Idunn DE Gaia Group 1,000 500 HVDC VSC -
h_3 NO Idunn SE Skogssater 1,000 500 HVDC VSC -
h_4 NL IJmuiden Hub 03 BE Zeebrugge 1,000 500 HVDC VSC Direct + Split
h_5 NO Idunn DE Gaia Group 2,000 500 HVDC VSC -
h_6 NO Lista NO Idunn 2,000 500 HVDC VSC Split
h_7 NL IJmuiden Hub 03 DE Gaia Group 2,000 500 HVDC VSC -
h_8 NL Oterleek BE Zeebrugge 1,000 500 HVDC VSC -
h_9 NO Lista SE Skogssater 1,000 500 HVDC VSC Direct
h_10 NO Idunn GB Dogger Bank E 1,000 500 HVDC VSC Direct
h_11 GB Dogger Bank E NL IJmuiden Hub 3 1,000 500 HVDC VSC Split
h_12 NO Idunn GB Dogger Bank E 2,000 500 HVDC VSC Split
h_13 GB Dogger Bank E NL IJmuiden Hub 3 2,000 500 HVDC VSC -
h_14 GB Dogger Bank E DE Gaia Group 2,000 500 HVDC VSC -
h_15 DE Gaia Group DE
Globaltech
Group
1,000 500 HVDC VSC -
h_16 NL IJmuiden Hub 03 NL IJmuiden Hub 2 1,000 500 HVDC VSC -
h_17 GB Dogger Bank E GB Dogger Bank C 1,000 500 HVDC VSC Split
h_18 SE
Södra
Midsjöbanken
LT Klaipeda 1,000 320 HVDC VSC -
h_19 DE
Arkona-Becken
Südost
words electricity is bought where it is cheapest and
it is sold where it can be sold for the highest price.
If interconnection capacity would be unlimited, the
wholesale market price levels would be equal across
Europe. However the limited interconnection capacity
between countries limits the trade and the prices cannot
be fully levelled. The price differences thus reflect
the price for transmission capacity between countries.
If new interconnecting lines are built either on- or offshore,
the trading volumes are increased and price
levels differences are reduced. One could also interpret
it as follows: the supply curve of interconnection
capacity is increased and therefore the price for it is
reduced.
In particular new transmission capacities allow the
electricity to be produced where the production costs
are lowest and therefore additional transmission
capacity can lower the overall electricity generation
costs. This system cost reduction is considered as
the benefits of the transmission capacity that has to
be compared with the infrastructure cost in order to
determine the net benefits.
SE
Södra
Midsjöbanken
1,000 320 HVDC VSC -
In order to assess this task the price levels between
all countries were listed and the highest price levels
were identified. This sorted list of highest price differences
between countries was used as an indicator for
the most beneficial interconnections. As detailed in
chapter 4.5 the OffshoreGrid consortium tested two
methodologies. The Direct Design approach and the
Split Design approach:
• The Direct Design approach starts from the Hub
Base Case scenario 2030 and adds direct interconnections
between the countries. In the next step
hub-to-hub connections and finally meshed grid elements
are added.
• The Split Design equals the Direct Design, but
in the first step the direct interconnections are
mirrored with split wind farm connections (s. chapter
4.3.1) where beneficial.
At each of these steps the price levels between the
countries are changed. This is displayed for the direct
approach in Table 13.6 and for the Split Design approach
in Table 13.5.
138 OffshoreGrid – Final Report