Bob,

Here are scheduled CA NG plant changes for 2018-2020.

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The Calpine plant is in AZ - South Point Energy Center. I have no problem with the 7 year PPA as APS will be losing capacity(315MW) and generation from Navajo coal which closes at end of year.

Let's see what happens to their other coal plants over next few years. I am guessing that solar/storage plans along with NG from Calpine plant means that Cholla coal shutdown will be announced within next couple of years.

Four Corners - APS' stake in Four Corners makes 970 megawatts of energy available to the APS system.
Cholla - APS operates the plant and owns Units 1 and 3, which are capable of producing 387 megawatts of electricity. Note: Unit 2 at this plant was already shut down.

Overall AZ is still way behind where they should be in terms of clean generation. They have 31 TW of coal generation per year(29% of total) and solar only represented 6.3% of their total generation in 2018. They should be easily able flip the coal and solar numbers within the next 10 years.

New Mexico Embraces Transition to 100% Clean Energy