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Exhibit 3-11

Seasonal Variability

Seasnal Variation in Direct Normal Insolation (2005)
Month Houston dallas Brownsville Lubbock San Antonio El Paso Austin
1 1591 1836 1845 1486 1710 2397 1653
2 1323 1617 1292 2325 1087 2311 1319
3 2814 2764 2620 3938 3161 4432 3220
4 3371 3717 3098 4958 3273 5701 3775
5 3615 2947 3234 3588 2772 5160 2995
6 4323 4535 3896 5335 4213 6370 4797
7 3453 4166 3637 5299 4128 5210 4000
8 3431 3878 4098 4508 3867 4352 4052
9 3106 3612 3339 3975 3497 4364 3694
10 3138 2748 2549 2844 2664 3403 3172
11 1934 2370 2178 3082 2096 3368 2230
12 1596 1970 1344 1977 1633 2605 1738

Seasonal Variation in Global Horizontal Insolation (2005)
Month Houston dallas Brownsville Lubbock San Antonio El Paso Austin
1 2694 2745 3207 2679 2809 3417 2639
2 2860 3006 2991 3545 2484 3718 2691
3 4571 4489 4651 5377 4883 6008 4637
4 5573 5781 5565 6737 5518 7386 5685
5 6168 5527 5888 6041 5440 7286 5582
6 6912 6972 6555 7472 6769 8215 7047
7 5909 6351 6170 7273 6513 7295 6338
8 5676 5997 6350 6387/td> 6027 6391 6129
9 5164 5331 5336 5719 5370 5990 5374
10 4683 4216 4317 4144 4222 4715 4439
11 3306 3408 3732 3897 3365 4256 3461
12 2696 2848 2627 2871 2741 3484 2775

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