Table 10: Risk and return of Portfolios of different power generation in seven regions.

No. Area Return Risk
No.1 North China 26.05% 10.14%
No.2 Northeast China 39.73% 9.77%
No.3 East China 30.44% 10.61%
No.4 Central China 35.51% 11.68%
No.5 Northwest 38.08% 12.88%
No.6 South China 14.87% 3.93%
No .7 whole country 38.42% 8.81%