Final answer:
Texas has the greatest wind power capacity in megawatts, with approximately 8.7 GW of installed wind capability as of 2018, surpassing Oklahoma, Iowa, and California.
Step-by-step explanation:
The state with the greatest wind power capacity in megawatts (MW) is Texas. As of the latest information provided, Texas has a higher total wind power generation capacity compared to California, Iowa, and Oklahoma. In 2018, Texas had approximately 8.7 gigawatts (GW) of installed wind capacity, making it the leader in wind energy production in the United States.
By comparison, Oklahoma and Iowa had 3.2 GW and 2.5 GW of installed wind capacity, respectively. Although when comparing wind generation as a function of area, both Oklahoma and Iowa have higher concentrations of wind generation installations relative to their size compared to Texas. Moreover, it's important to note that the overall potential to expand wind power is considerable, given the comparison to the estimated fully-developed potential.