Since 1999 development work has taken place with an aim to integrate a large amount of PV (30 MWp or 300.000 m2 PV panels) in a whole city, Valby in Copenhagen to cover 15% of the yearly electricity demand by solar energy in the year 2025. . (See also www. solivalby. dk where a visualisation of where PV can be integrated is shown).

Key actors in this activity have been the Urban Renewal Copenhagen Company, the Copenhagen Energy electricity utility, the energy specialist company Cenergia and the municipality of Copenhagen.

In figure 1 there is an illustration of the size of this PV area and how the use of PV fits into an overall green accounting activity for Valby and Copenhagen. In figure 2 there is an illustration from Copenhagen Energy on the electricity peak shawing effect that only 15 MWp will have on the electricity use in Valby in June.

Due to the widespread use of CHP based electricity production in Denmark PV has a very positive effect because you can limit the operation of the CHP plants in the summer where the need for heat is low. In figure 3 there is shown examples of already realised PV projects in Valby and Copenhagen.

The main idea of working with PV integration for a whole city is to ensure good PV integration solutions so there will be developed a public support for the widespread use of PV instead of an opposition due to bad architectural solutions.

Another interesting aspect of this approach is that PV can be introduced as part of an overall sustainable building solution also aiming at general building qualities and energy savings.

In connection to this an activity of developing and exhibiting a PV assisted CO2 neutral test house in Valby was seen as a very relevant activity.