What Is Electrification?

Electrification is the process of supplying electric power to a location, a device, or an end use that previously relied on another energy source or on none at all. The term carries two distinct meanings in engineering practice. The first is extension of electric service to unserved populations, the sense used in rural electrification programs and in ongoing energy access work in sub-Saharan Africa and South Asia. The second, dominant in current power engineering, is the substitution of electricity for direct fossil fuel combustion at the point of final consumption: replacing a gas furnace with a heat pump, a diesel bus with a battery electric bus, or a fired process heater with an industrial resistance or heat pump system. The International Energy Agency's treatment of electrification defines it as the shift from any non-electric energy source to electricity at final consumption and tracks it through electricity's share of total final energy.

That share is the standard metric for the transition. It stood near 20 percent globally in the early 2020s, and decarbonization scenarios project it rising past 50 percent by mid-century, which implies both a much larger power system and a differently shaped one.

End-Use Electric Technologies

The technical case rests on devices that deliver a service using electricity more efficiently than combustion does. Air-source and ground-source heat pumps move heat rather than generating it, achieving coefficients of performance between two and four across most climates, so a unit of electricity displaces several units of fuel. Battery electric vehicles convert roughly three quarters of stored energy to wheel work against about a fifth for internal combustion. Induction cooking, electric arc and induction furnaces, resistance and infrared process heating, and electric boilers cover much of the industrial range, while high-temperature processes such as cement calcination and primary steelmaking require newer approaches including electrolytic hydrogen. NREL's Electrification Futures Study analysis of end-use technology cost and performance assembles the cost and efficiency trajectories these assessments depend on.

Demand Growth and Grid Impacts

Electrification changes the magnitude and the shape of demand. Heating electrification shifts winter peaks upward and can turn summer-peaking systems into winter-peaking ones, since heat pump capacity and efficiency both fall at low ambient temperature. Vehicle charging adds an evening ramp unless managed, and fast charging concentrates large loads at specific distribution nodes. Scenario work in the Electrification Futures Study finds electricity's share of United States final energy rising from 19 percent in 2016 to 32 percent under medium adoption and 41 percent under high adoption by 2050, with transportation contributing the largest growth. The consequences run through the whole system: additional generation and transmission capacity, distribution transformer and feeder upgrades, and greater value for flexible loads, time-varying rates, and storage that can spread new demand across off-peak hours.

Efficiency, Emissions, and Sequencing

Whether electrification reduces emissions depends on the generation mix serving the marginal load, so analysts compare end-use efficiency gains against the emissions intensity of the electricity supplied, using either average or short-run marginal factors. In grids with substantial coal generation, near-term gains from switching some end uses can be small, though the equipment installed will keep operating as the grid decarbonizes, which is why sequencing and equipment lifetime matter to the accounting. Fuel switching also interacts with efficiency policy, since building envelope improvements reduce the heat pump capacity required, and with gas system planning, because declining throughput on a distribution network with fixed costs raises rates for remaining customers.

Applications

Electrification has applications in a range of fields, including:

• Building heating, cooling, water heating, and cooking retrofits
• Road, rail, and port transportation, including fleet and transit conversion
• Industrial process heat, melting, and drying operations
• Rural energy access through grid extension, minigrids, and solar home systems
• Utility resource planning, load forecasting, and rate design
• Mining and heavy equipment conversion to battery and trolley assist systems