Turbine Repair

H5 Turbine Repair Presented on November 14 2022

11/9/2022

1

Request for Purchase Order • IPL staff recommends approval of a Purchase Order to General Electric (GE) to inspect and repair the turbine section of Combustion Turbine H5.

11/9/2022

2

CT H5 Turbine Vibration • One of our two gas fired turbines, most frequently called on by SPP • Unknown vibration in the turbine section, preventing it from reaching continuous operating speed • Manufactured and serviced by General Electric (GE) • Proposal provided by GE to repair the unit and return it to service.

11/9/2022

3

GE 5000 Series Generator Rotor

11/9/2022

4

GE 5000 Series Combustion Turbine

11/9/2022

5

Repair H5 • Purchase Order request to include multiple contingencies depending on scope of work required as well as moving forward the next Major Inspection • GE representatives addressed the Council last year to provide technical expertise on GE Frame 5 Combustion Turbines and additional insight into the life expectancy of these units.

11/9/2022

6

GE 5000 Series: Robust Workhorse • Life extension inspections: 5000 fired startups or 200,000 fired hours.

• For comparison, H5 (2825 starts and 23,654 hours) H6 (2615 starts and 19,528 hours) • Approximately 3000 Frame 5 and Frame 3 turbines still in operation.

• Approximately 60% of all Frame 5 turbines produced, still in operation

11/9/2022

7

Increased wind turbine capacity contributes to volatility and price spikes when the wind drops off 140

14,000

120

12,000

100

10,000

80

8,000

60

6,000

40

4,000

20

2,000

-

-

(20)

Price ($/MWh)

16,000

1:00 3:00 5:00 7:00 9:00 11:00 13:00 15:00 17:00 19:00 21:00 23:00 1:00 3:00 5:00 7:00 9:00 11:00 13:00 15:00 17:00 19:00 21:00 23:00

Generation (MW)

Wind Generation and Electricity Price (Typical 48h Period)

Wind Generation

11/9/2022

Electricity Price

8

Growth of renewable-based capacity and volatility creates an opening for on system peaking units • Renewable resources (mostly wind turbines) account for growing share of SPP capacity – Renewables only produce when the wind is blowing and sun is shining

• SPP relies on other resources that can fill the gap left by renewables

• Baseload units (traditional coal plants) have trouble competing with renewables on a cost basis and can’t turn on/off quickly enough to meet demand when the price is right • Peaking units (natural gas turbines) ramp up quickly to provide electricity for short periods of time when electricity demand and price are high • Peaking units can fill gaps left by renewables, quickly and cost competitively

11/9/2022

9

IPL CTs Support the Grid • Calendar Year 2022 – IPL diesel fueled turbines have been called on more than 150 times.

• Generation credits with SPP (after fuel costs) have totaled almost $750,000 • Typically, H5 is called on before the other units and more often had it been available.

11/9/2022

10

Summary • Repair H5 Turbine and maintain asset benefits ▪ Maintain 17 MW of required Capacity ▪ Return a productive asset to operation ▪ Provide internal strength to IPL’s system Reliability and Resilience ▪ Keep options open for future decisions

11/9/2022

11

Questions ?

11/9/2022

12