While George will cover our 2022 expectations in detail, I’d like to reiterate the direction we gave during the IEA acquisition call of our future expectations. Included in the slide deck we provided, we laid out a path for 2023 of revenues of approximately $13 billion with EBITDA of $1.2 billion. One of the things I’m proudest of during my tenure as CEO over the last 15 years has been our consistency and our ability over many years to meet and exceed guidance.
I’m not pleased that we’ve had to adjust our guidance over the last few quarters. And in planning for 2023 and the early outlook we provided, we were cautious to create targets we felt we could achieve with a high degree of confidence. I understand that today these are just words, but we, as an organization, are motivated and excited to show what MasTec can do and achieve.
I’d like to take this opportunity to thank the men and women of MasTec for their performance and hard work. I’m honored and privileged to lead such a great group. The men and women of MasTec are committed to the values of safety, environmental stewardship, integrity, honesty, and in providing our customers a great quality project at the best value. These traits have been recognized by our customers, and it’s because of our people’s great work that we’ve been able to deliver these financial results in a challenging environment and position ourselves for continued growth and success.
I’ll now turn the call over to George for our financial review. George?
George L. Pita
Chief Financial Officer & Executive Vice President, MasTec, Inc.
Thanks, José, and good morning, everyone. Today, I’ll review our second quarter 2022 financial results and provide some additional color on our guidance expectation for the balance of the year. For the sake of clarity, discussion of 2022 guidance will not include any contribution from the recently announced IEA acquisition, which is expected to close late in the fourth quarter. If any effect from the proposed IEA acquisition is assumed in any future expectation discussed in my remarks, that assumption will be clearly indicated.
As Marc indicated at the beginning of the call, our discussion of financial results and guidance will include non-GAAP adjusted earnings and adjusted EBITDA. Reconciliation and details of non-GAAP measures can be found in our press release, SEC filings or on our website.
Second quarter results were generally in line with our guidance expectation communicated during our first quarter earnings with revenue at $2.3 billion and adjusted EBITDA of $179 million. Second quarter revenue grew approximately $300 million, a 17% year-over-year increase, comprised of approximately $600 million in revenue growth in our non-Oil & Gas segments, mainly our Communications, Power Delivery and Clean Energy and Infrastructure or Clean Energy segments. This revenue growth was partially offset by an expected year-over-year decrease in our Oil & Gas segment of approximately $300 million.
Second quarter revenue trends reflect a strategic shift we have made to expand our operations and capacity in areas where end market demand is growing. To put the significance of this shift in perspective, full year 2022, we expect to generate slightly over $8 billion of revenue from our non-Oil & Gas segments, representing almost 90% of our annual $9.2 billion revenue estimate. As a comparison, less than two years ago, our annual 2020 non-Oil & Gas segment revenue was only $4.5 billion.
In summary, we are in the midst of a significant transition in our end markets business mix while also completing integration efforts on 2021 Power Delivery segment acquisitions. This, coupled with inflationary cost pressures, have made this year disappointing from an earnings perspective. That said, we strongly believe that we have well-positioned the company for long-term opportunities in both revenue growth and operating profit expansion.