Sudhakar Kesavan
Analyst · SunTrust
Thanks, Doug, and good afternoon, everyone, and thank you for participating in our review of ICF's first quarter results and business outlook. First quarter results represented a solid start to the year and demonstrated the benefit of the diversification strategy we have implemented over the last 3 years to build out our commercial and international businesses.
Domestic commercial revenue grew 7.7% compared to last year's first quarter. International government revenues more than doubled. And together, commercial and international government growth more than offset lower U.S. federal government revenue. In the aggregate, commercial and international government revenues accounted for 37% of total revenue for the quarter, up from 33% in last year's first quarter.
And as expected, our state and local business saw positive comparisons this quarter, primarily due to the ramp-up of disaster recovery work for the State of New Jersey and the ramp-up of the large West Coast infrastructure project, for which we managed the environmental assessment. As a result, our revenues from non-U.S. federal clients, that are comprised of work with commercial, international government and state and local clients, accounted for 47% of ICF's total first quarter 2014 revenue, up from 41% in last year's first quarter and about 50% higher than the 32% it represented 3 years ago.
Our federal government business declined $9.5 million, 6.8% compared to last year's first quarter. A significant portion of the fall off was due to the severe weather on the U.S. East Coast, which resulted in 4 days of federal government office closings in the first quarter, including the well-documented ice storm in Atlanta, where we have more than 200 people working for the CDC. We estimate the dollar value of the lost revenues due to weather to be approximately $4 million to $5 million, largely related to our federal business.
While we expect commercial and international government revenues to continue to outpace our federal business in terms of revenue growth, we do expect the federal business to pick up in subsequent quarters of this year. This expectation is based on our backlog and ICF's recognized domain expertise in health and energy, broadly defined where demand is strong.
The key growth drivers in our commercial business this quarter were digital interactive, energy efficiency, health care consulting and a pickup in our energy market transaction advisory work. In digital interactive, we benefited from additional assignments from existing clients and new projects, thanks to our expanded fleet of services and successful cross-selling efforts.
Energy efficiency remains the biggest growth driver of our commercial business, increasing 6.1% and accounting for 40% of total commercial revenue. We won a mix of add-ons and new business in this area in the first quarter and the dollar value of energy efficiency programs in our pipeline at the end of the first quarter was equal to over 60% of the total value of the commercial bids in our pipeline.
We are pleased by the positive momentum we continue to see in our commercial health care business, which is growing at an impressive rate year-over-year, reflecting our unique ability to leverage our subject matter expertise to gain traction in the payers and providers market.
And we have continued to notice a pickup in demand for advisory work around energy market transactions. This business, similar to our aviation consulting work, tends to be lumpier than our core commercial activity, and there is not enough visibility for quarterly results to be considered a trend. However, we see important opportunities to continue to grow both these high-margin areas, health care and energy, by expanding our service offerings and broadening our client base.
First quarter results benefited from 2 months of the Mostra acquisition and about 2 weeks of the CITYTECH acquisition. Integration of both companies is progressing well, and we have already begun the cross-selling process. In the first quarter, we took some contract write-downs related to ECA, the small technology acquisition we made in the middle of last year, and we released the estimated fair value of their earnout. We still believe that the acquired capabilities of implementing Hybris, a multichannel e-commerce software platform, is very valuable and rounds out ICF's suite of digital interactive business capabilities that we provide to commercial and government clients.
Hybris has since been acquired by SAP. Also, since the acquisition of CITYTECH, we have seen promising opportunities to bundle the Adobe capabilities of CITYTECH, Hybris and our legacy digital interactive business to pursue new work that leverages the collective capabilities and client relationships of these now-combined entities.
The weather, ECA and acquisitions affected our reported first quarter results. Our CFO, James Morgan, will review each of these items in detail later in the call. Excluding all of these impacts, the estimated revenue would have been between $249 million and $250 million, EBITDA between $22.6 million and $23 million and diluted EPS would have been between $0.51 and $0.52. Acquisitions remain an important element to ICF's growth strategy and we continue to explore opportunities to extend our footprint in key business and geographic markets.
Therefore, to sum up, first quarter results benefited from our increasingly diversified business mix. I will now turn the call over to ICF's President and Chief Operating Officer, John Wasson, to provide a more detailed operating review.