Environmental Engineering Reference
In-Depth Information
Figure 4.14
Principle of coordinating combined power plants to guarantee renewable
electricity supply.
date:
time:
24.07.06
00:00
25.07.06
26.07.06
27.07.06 28.07.06
one week
29.07.06
30.07.06
25. July 17:00
MW
8.0
7. 0
6.0
solar energy
wind energy
biogas energy
storage energy
(pumped hydro)
export/import
electricity demand
5.0
4.0
3.0
2.0
1. 0
Figure 4.15
Proportion of different renewable power plants covering energy requirements
during the course of a summer week with the combination power plant project.
Source: www.
kombikraftwerk.de.
of the actual German electricity requirement. To do so, a central control centre
received information on load profi les as well as on current weather projections. If
wind and solar plants do not create enough electricity, then other plants have to
step in. In the case of a combination power plant, these would be biogas power
plants and a pumped storage station. As biogas is easily stored, electricity can be
generated at any time. Surplus supplies can then be stored temporarily in pumped
storage stations or used to charge batteries for electric cars. There are very few cases
when the production of wind and solar energy plants has to be cut back due to long
