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Neutral hydrogen (HI) intensity mapping (IM) surveys are considered apromising tool for investigating the expansion history of the Universe. In thiswork, we explore the potential of MeerKAT HI IM observations in interferometermode to estimate the power spectrum and constrain cosmological parameterswithin typical dark energy models. We employ an approach called the "delayspectrum," which allows us to separate the weak HI signal from foregroundcontamination in the frequency domain. Our findings indicate that the choice ofsurvey fields significantly impacts the fractional errors on the power spectrum($\Delta P/P$) within a limited observational time of 10 hours. As theintegration time increases from 10 hours to 10,000 hours, $\Delta P/P$progressively decreases until cosmic variance begins to dominate. For a totalobservation time of 10,000 hours, the lowest $\Delta P/P$ at low $k$ can beachieved by tracking 100 points for MeerKAT L-band (900-1200 MHz) and 10 pointsfor MeerKAT UHF-band (580-1000 MHz). Next, we assess the performance of HI IMin constraining typical dark energy models. We find that MeerKAT HI IM surveyin interferometer mode demonstrates limited capability in constraining thedark-energy equation of state, even when combined with Planck data.

HI intensity mapping with MeerKAT: forecast for delay power spectrum measurement using interferometer mode