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To stabilize high voltage in a lightly loaded area, focusing on the absorption of VARs (Volt-Ampere Reactive) by utilizing generators is essential. In lightly loaded conditions, the system may experience high voltage levels due to reduced demand for reactive power, leading to excess voltage.

Generators can be employed to absorb VARs, thereby helping to counteract the high voltage condition by effectively reducing the voltage levels in the system. This absorption occurs by drawing reactive power from the system, which helps reduce the voltage to a more stable and manageable level.

In contrast to other options, activating additional generation might introduce more complexity to the system without directly addressing the voltage issue, while increasing system inertia generally relates to frequency stability rather than voltage regulation. Reducing transmission line load tends to focus on easing the strain on the lines and may not solve the immediate high voltage problem effectively. Therefore, utilizing generators to absorb VARs is the most direct and effective method to bring high voltage levels under control in this context.