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| Year Ended December 31, | ||||||||||||
| PNM Plan | 2010 | 2009 | 2008 | |||||||||
| Discount rate for determining December 31 PBO |
5.72 | % | 6.47 | % | 7.25 | % | ||||||
| Discount rate for determining net periodic benefit cost (income) |
6.47 | % | 7.25 | % | 6.88 | % | ||||||
| Expected return on plan assets |
8.75 | % | 8.75 | % | 8.50 | % | ||||||
| Rate of compensation increase |
N/ | A | N/ | A | N/ | A | ||||||
| TNMP Plan |
||||||||||||
| Discount rate for determining December 31 PBO |
5.50 | % | 6.31 | % | 7.25 | % | ||||||
| Discount rate for determining net periodic benefit cost (income) |
6.31 | % | 7.25 | % | 6.72 | % | ||||||
| Expected return on plan assets |
8.75 | % | 8.75 | % | 8.50 | % | ||||||
| Rate of compensation increase |
N/ | A | N/ | A | N/ | A | ||||||
| Year Ended December 31, | ||||||||||||
| 2010 | 2009 | 2008 | ||||||||||
| (In thousands) | ||||||||||||
| PNM Plan |
||||||||||||
| Service cost |
$ | 419 | $ | 417 | $ | 713 | ||||||
| Interest cost |
7,650 | 7,388 | 8,344 | |||||||||
| Expected return on plan assets |
(5,572 | ) | (5,832 | ) | (6,128 | ) | ||||||
| Amortization of net (gain) loss |
5,489 | 3,290 | 4,816 | |||||||||
| Amortization of prior service credit |
(4,143 | ) | (4,262 | ) | (5,687 | ) | ||||||
| Net periodic benefit cost |
$ | 3,843 | $ | 1,001 | $ | 2,058 | ||||||
| TNMP Plan |
||||||||||||
| Service cost |
$ | 289 | $ | 260 | $ | 284 | ||||||
| Interest cost |
711 | 733 | 716 | |||||||||
| Expected return on plan assets |
(514 | ) | (495 | ) | (486 | ) | ||||||
| Amortization of net (gain) loss |
(195 | ) | (265 | ) | (271 | ) | ||||||
| Amortization of prior service cost |
60 | 60 | 60 | |||||||||
| Net periodic benefit cost |
$ | 351 | $ | 293 | $ | 303 | ||||||
| Year Ended December 31, | ||||||||||||
| PNM Plan | 2010 | 2009 | 2008 | |||||||||
| Discount rate for determining December 31 APBO |
5.59 | % | 6.42 | % | 7.25 | % | ||||||
| Discount rate for determining net periodic benefit cost |
6.42 | % | 7.25 | % | 6.91 | % | ||||||
| Expected return on plan assets |
8.75 | % | 8.75 | % | 8.50 | % | ||||||
| Rate of compensation increase |
N/ | A | N/ | A | N/ | A | ||||||
| TNMP Plan |
||||||||||||
| Discount rate for determining December 31 APBO |
5.59 | % | 6.42 | % | 7.25 | % | ||||||
| Discount rate for determining net periodic benefit cost |
6.42 | % | 7.25 | % | 6.91 | % | ||||||
| Expected return on plan assets |
6.70 | % | 6.70 | % | 6.50 | % | ||||||
| Rate of compensation increase |
N/ | A | N/ | A | N/ | A | ||||||