Amid rising interest rates and investors’ preference for cyclical sectors, utilities stocks and the corresponding ETFs are struggling this year. For example, the Utilities Select Sector SPDR (NYSEArca: XLU), the largest utilities ETF by assets, is down nearly 6% year-to-date.

Some market observers believe that heightened market uncertainties, which could appear later this year, could bolster the case for defensive sectors, including utilities.

To this point in 2018, “we’ve seen large divergences in performance across the risk spectrum of assets, a situation that’s ‘fine for now,’ but by the end of 2018, that hierarchy will be ‘misplaced’ given a more uncertain outlook, based on tightening financial conditions and growth rates that look ‘peaky,’” reports Teresa Rivas for Barron’s, citing Morgan Stanley’s Michael Wilson.

Rate Impact on Utilities Sector

Nevertheless, the utilities sector remains sensitive to changes in interest rates. Once the Fed eventually hikes interest rates, the higher rates will make fixed-income instruments more attractive on a relative basis, and bond-like equities, like utilities, less enticing. Consequently, utilities may remain flat or underperform other segments of the equities market once rates start ticking higher.

The Federal Reserve raised interest rates for the second time this year last week and is expected to increase borrowing costs two more times before the end of 2018.

Related: 4 Utilities ETFs Shine Amid Market Uncertainty