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CMEP said to be lining up GracoRoberts for sale; ECP reacquires nuclear waste management company

Reported by Pehub
Apr 9, 2026· 2 min read
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Key Takeaways
  • • Energy Capital Partners (ECP) has reacquired EnergySolutions, marking the second time the firm has purchased the nuclear waste management company, signaling continued strategic interest in the sector.
  • • Castanea Partners/Energy Management Partners (CMEP) is preparing to divest GracoRoberts, indicating portfolio optimization activity within the energy infrastructure investment space.
  • • The EnergySolutions reacquisition by ECP demonstrates repeat investment patterns in nuclear waste handling, a specialized infrastructure asset class with long-term contract visibility.
Summary
Energy Capital Partners has completed a reacquisition of EnergySolutions, the nuclear waste management company, in what marks the firm's second purchase of the asset. This transaction underscores ECP's strategic focus on specialized infrastructure assets within the nuclear and energy sectors, where established operations and regulatory frameworks provide predictable revenue streams.

Concurrent with ECP's EnergySolutions activity, Castanea Partners/Energy Management Partners (CMEP) is advancing plans to sell GracoRoberts, a portfolio company. The dual transaction activity reflects broader portfolio repositioning within the energy infrastructure investment community, as firms adjust holdings to match market conditions and strategic priorities.

The EnergySolutions reacquisition is particularly noteworthy given ECP's prior ownership, suggesting the firm views nuclear waste management as a resilient, defensible asset class. Nuclear waste handling represents a specialized service with high barriers to entry, regulatory compliance requirements, and long-term contractual relationships with utilities and government entities. The fact that ECP returned to acquire the asset a second time indicates confidence in the business model's fundamentals and potential value creation opportunities.

These transactions reflect broader trends in energy infrastructure investing, where established private equity firms are consolidating positions in specialized sub-sectors like nuclear waste management while simultaneously pruning non-core or mature assets from their portfolios. The activity also highlights ongoing capital deployment in the energy sector despite macroeconomic volatility.

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Sources

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AlphaMaven summarised this story from the reporting below. Each link opens the original article.

Pehub CMEP said to be lining up GracoRoberts for sale; ECP reacquires nuclear waste management company