James Watt, who improved the steam engine in Britain, introduced the concept of "horsepower" to explain the performance of machines. He used the strength of a horse as a benchmark to describe an invisible force. That force was later formalized into a unit bearing his name: the "watt." It represents a shift in the language humans have developed to understand energy. One watt means the power to use one joule of energy per second. It is a small amount of energy that people can barely feel, roughly the power a smartphone consumes in standby mode.
The power generation facilities operated by Korea East-West Power are expressed in megawatts (MW), a unit equal to one million watts. The total installed capacity is about 9,600 MW, accounting for 6.5 percent of the country's generation facilities. Annual output from these facilities reached approximately 34,556 GWh as of 2024, equivalent to about two-thirds of Seoul's total electricity consumption. Korea's electricity consumption has expanded several hundredfold, from several thousand GWh in the 1960s to more than 540,000 GWh today. As the economy grew and industry expanded, Korean society shifted to an electricity-centered energy consumption structure. In particular, Korea relies on overseas imports for more than 90 percent of its energy consumption, and roughly 30 percent of that is used for power generation. The country uses a large amount of electricity while depending on outside sources for most of its raw materials. That is why shifts in the international situation immediately translate into higher energy import costs and rising prices. The more energy consumed, the more vulnerable the country becomes to external shocks. Changing this structure requires not only expanding power generation but also transforming how electricity is used. Korea's total electricity consumption ranks seventh among Organization for Economic Cooperation and Development (OECD) countries, and its energy intensity, a measure of energy use efficiency, stands at 0.165, 1.7 times higher than the OECD average of 0.097, leaving substantial room for improvement in the structure of electricity consumption.
Amid this growing awareness, the concept of "negawatt" has emerged. Combining the power unit megawatt with "negative," the term treats saved electricity as a resource in itself. Reducing electricity, not just generating it, is now recognized as a form of supply. The negawatt concept is delivering tangible results in the field. Korea East-West Power has pursued integrated efficiency projects covering energy audits, facility upgrades and follow-up management at more than 50 sites, including 21 university campuses and 26 public facilities nationwide, turning "saved electricity" into an actual resource. As a result, the company has cumulatively reduced annual electricity consumption by about 40.3 GWh and cut carbon emissions by roughly 69,000 tons. This has the same effect as securing electricity without building additional power plants, equivalent to 66 MW of combined-cycle generation and 123 MW of solar power. It is an "invisible power plant" made real.
As electrification accelerates in the drive toward carbon neutrality, energy conservation is no longer a supplementary measure. Overcoming the limits of expanding generation facilities requires striking a balance by using less electricity. Saved electricity functions as a new resource, serving as an "invisible power plant" that produces real power though unseen. Using less energy is itself a choice to create energy.
