Houston-based private equity firm Pelican Energy Partners has raised a $450 million fund to invest in nuclear energy services and equipment companies.

Pelican had aimed to raise $300 million for Pelican Energy Partners Base Zero LP and had imposed an initial “hard cap” of $400 million. Investors include endowments, foundations, family offices, and pension plans.

As of the fund’s closing date, the fund had wrapped up six investments, with several more deals expected to close by the end of this year.

In a news release, Pelican says the fund “is committed to growing and improving nuclear services companies, which are critical to sustaining and enhancing the installed nuclear power generation base.” Nuclear energy accounts for more than one-fifth of U.S. power generation and nearly half of U.S. carbon-free electricity.

“The wide-ranging enthusiasm for Base Zero is a testament to the growing interest and necessity of nuclear power. We look forward to continuing to build an outstanding portfolio where we can add substantial value and achieve excellent returns for our partners,” says Jay Surina, managing director of Pelican.

Since 2012, Pelican has raised over $1 billion for investments in companies in the energy services, equipment manufacturing, and technology sectors.

Houston-area companies that have received Pelican investments include AWC Frac Technology, Axon Energy Services, GHT, Vault Pressure Control, Epic International, P360 Management Solutions, Multilift Wellbore Technology, EnerCorp, Downhole Technology, and Capline Environmental Services.