Joseph J. Hamrock
President, Chief Executive Officer and Director at NiSource
Thanks, Chris. Good morning everyone and thank you for joining us. Hopefully, you've all had a chance to read our third quarter earnings release, which we issued earlier today. Strong execution of NiSource's significant renewable energy investments continues to be the highlight of our foundation for future growth and we continue to expect that our core infrastructure programs and renewable generation investments will drive industry leading compound annual growth of 7% to 9% in diluted net operating earnings per share through 2024, growth driven by our commitments to safety, reliability, customer affordability and sustainability.
As we begin to refine our outlook for longer-term growth, the preferred path from NIPSCO's 2021 Integrated Resource Plan identifies additional investment opportunities, while advancing the retirement of remaining coal-fired generation between 2026 and 2028 and it supports our plan to reduce greenhouse gas emissions 90% by 2030.
Let's turn now to Slide 3 and take a closer look at our key takeaways. We are updating our guidance for 2021 to target the top end of the range of a $1.32 to a $1.36 per share in non-GAAP diluted net operating earnings or NOEPS. We are also initiating guidance for 2022 of a $1.42 to a $1.48 and that is consistent with our 5% to 7% near term growth commitment. Our long-term diluted NOEPS guidance of 7% to 9% through 2024 is now based on the expected top end of our 2021 guidance range and we reaffirm 5% to 7% growth in 2023.
As I mentioned a moment ago, the preferred plan from NIPSCO's 2021 IRP, advances our plans to retire remaining coal-fired generation between 2026 and 2028 as we shift to lower cost, clean and reliable generation. Investments of up to $750 million will be required to replace retiring coal-fired generation. The NIPSCO portion of this investment will be better understood following further evaluation of the proposals we solicited associated with the IRP. Our regulatory execution progresses with a proposed order approving a settlement in Pennsylvania, a settlement filed in Kentucky and a proposed order in Maryland. In addition, we filed a gas rate case in Indiana in September. We achieved non-GAAP diluted NOEPS of $0.11 in the third quarter of 2021 versus $0.09 in 2020.
Now let's look at some NiSource utilities highlights for the third quarter, starting with our gas operations on Slide 9. Columbia Gas of Ohio rate case continues to progress. Net of the trackers being rolled into base rates, the filing requests an annual revenue increase of approximately $221 million. Pending its decision next year from the Public Utilities Commission of Ohio, new rates would be effective in mid 2022. NIPSCO filed a gas rate case on September 29th requesting a revenue increase of $115 million annually. The case is focused on infrastructure modernization and providing safe, reliable service, while remaining in compliance with state and federal safety requirements.
In Pennsylvania, an Administrative Law Judge issued a proposed order recommending that the Pennsylvania Public Utility Commission approved the settlement in our rate case. The settlement would increased revenue by $58.5 million with new rates effective December 29th of this year. The adjusted rates will help to continue investments in infrastructure upgrades, system reliability and maintenance enhancements. We expect the Commission's final order by mid-December.
In Kentucky, we have filed a proposed settlement of our rate case. The settlement includes an overall increase in revenues of $18.6 million to support continued investments in safety and replacing aging infrastructure. Columbia Gas of Maryland received a proposed order from an administrative law judge on Friday, recommending an increase of approximately $2.56 million in revenues as compared to our request of approximately $4.8 million. We expect a final order from the Maryland Public Service Commission in December.
Before we move on, I'd like to note the Columbia Gas of Ohio, our largest LDC, is ranked number 1 in the Midwest region in J.D. Power's 2021 Gas Utility Business Customer Satisfaction Study. Also congratulations to our customer experience team for the successful launch of the Columbia Gas and NIPSCO mobile apps. They are an important step forward in building our connected digital customer experience.
Let's now turn to our electric operations on Slide 10. NIPSCO's electric TDSIC plan is pending before the Indiana Utility Regulatory Commission or IURC. This is a five-year $1.6 billion proposal that would replace the previous plan, which NIPSCO filed in April to terminate. The pending plan includes newly identified projects aimed at enhancing service and reliability for customers as well as some previously identified projects. The other items on this slide relate to our renewable generation strategy and I'll turn it over to Shawn Anderson to give more detail.