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Lease Commitments (Details) - PNM $ in Millions	Jan. 15, 2016 USD ($) lease MW	Sep. 30, 2018 USD ($) lease	Jan. 31, 2016 lease	Jan. 16, 2016 lease	Jan. 15, 2015 lease
Palo Verde Nuclear Generating Station, Unit 1 Leases
Operating Leased Assets [Line Items]
Number of leases, expiring					4
Number of leases under which lease term was extended					4
Palo Verde Nuclear Generating Station, Unit 2 Leases
Operating Leased Assets [Line Items]
Number of leases, expiring				4
Number of leases under which lease term was extended				1
Number of leases under which assets were purchased	3	3	3	3
Leased capacity to be purchased (in megawatts) | MW	32.76
Palo Verde Nuclear Generating Station, Unit 2 Leases, 31.25 MW
Operating Leased Assets [Line Items]
Number of leases under which assets were purchased	1
Payment to lessors | $	$ 78.1
Palo Verde Nuclear Generating Station, Unit 2 Leases, January 15, 2016
Operating Leased Assets [Line Items]
Leased capacity to be purchased (in megawatts) | MW	31.25
Palo Verde Nuclear Generating Station, Unit 2 Leases, 32.76 MW
Operating Leased Assets [Line Items]
Number of leases under which assets were purchased	2
Payment to lessors | $	$ 85.2
Palo Verde Nuclear Generating Station
Operating Leased Assets [Line Items]
Loss contingency, lease arrangements (up to) | $		$ 163.8

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The difference between the maximum amount of estimated loss and the amount recorded as of the balance sheet date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 05
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=99385795&loc=d3e12631-108344

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