If the actual frequency drops to 59.90 Hz when the bias setting is 50 MW/.1 Hz, what is the immediate impact on power generation?

To understand the immediate impact on power generation given that the actual frequency has dropped to 59.90 Hz with a bias setting of 50 MW/.1 Hz, it helps to recognize how frequency and bias settings relate to generation levels.

Typically, a frequency drop indicates that the system is under-generating compared to the demand. The bias setting of 50 MW/.1 Hz means that for every 0.1 Hz drop in frequency, the generation should ideally increase by 50 MW to stabilize the frequency. In this scenario, since the frequency has decreased from the nominal level of 60 Hz to 59.90 Hz, there is a drop of 0.1 Hz.

Applying the bias setting to this frequency drop indicates that the system would need to increase power generation by 50 MW to maintain stability at the desired frequency level. However, in this case, the question posits the generation state rather than the corrective action needed.

If no additional power generation occurs in response to the frequency drop, the system would be 50 MW under-generating, as it would not be meeting the demand required to maintain the frequency at 60 Hz. Consequently, if we examine the last option in terms of generation, saying that we are 25 MW