Energy Access: The Reason Any of This Matters

Who Is Actually Without Power

The number without electricity fell from roughly 1.2 billion in 2010 to about 700 million, one of the more substantial development achievements of the period, driven largely by India, Bangladesh, Kenya and Indonesia. It then stalled and briefly reversed during the pandemic and the energy price shock, when affordability rather than availability pushed households back off the grid.

The remaining population is concentrated: roughly four fifths in sub-Saharan Africa, and within that, heavily rural. Nigeria, the Democratic Republic of Congo and Ethiopia account for a large share between them. These are the households furthest from existing infrastructure, which is precisely why they were connected last.

Being connected is also not the same as having power. Grid reliability in many countries means several hours of supply a day, or unpredictable supply, which is why backup diesel generators are ubiquitous in Nigerian cities and why a connection statistic overstates what people actually have.

The tier framework used by the World Bank captures this better than a binary. Tier 1 is a few hours of light and phone charging. Tier 3 supports a refrigerator and a fan. Tier 5 is what a European household would recognise as normal supply. Most newly connected households are at tier 1 or 2, which is transformative compared with nothing and far from sufficient for economic activity.

The Problem That Kills More People

Roughly 2 billion people cook over wood, charcoal, dung or crop residue, usually indoors and usually on an open fire or a basic stove. The smoke contains fine particulates at concentrations far above any outdoor air quality standard, and the people breathing it are overwhelmingly women and small children.

Household air pollution from cooking is associated with around 3 million premature deaths a year - more than malaria and tuberculosis combined, and more than the lack of electricity causes by any direct mechanism. It is among the largest environmental health burdens in the world and among the least discussed.

The other costs compound it. Gathering firewood consumes hours daily, almost entirely of women's and girls' time, displacing school and paid work. It drives deforestation in already stressed regions. And in conflict areas the journey to gather fuel carries physical danger.

Solutions exist at every price point and none has scaled as hoped. Improved biomass stoves cut smoke substantially and cost little but require the user to change habits. Liquefied petroleum gas is clean at the point of use and requires a supply chain and recurring cash, which is what defeats it for households whose income is irregular. Electric induction cooking works where supply is reliable enough, which returns to the first problem. Progress here has been consistently slower than electrification, and it is the larger health prize.

Why the Grid Stopped Being the Answer

For a century, electrification meant extending a national grid. For a remote village of a few hundred people, that meant kilometres of line for a load smaller than a single European street, and the arithmetic rarely worked. Many such villages were scheduled for connection in plans that were never funded.

Two cost collapses changed this. Solar modules fell more than 99 percent in price over fifty years, and lithium batteries about 90 percent since 2010. At the same time LED lighting and efficient direct-current appliances cut the load itself by a factor of five to ten, so a system that once needed a kilowatt now needs a hundred watts to do the same job.

The result is a genuinely new option. A solar home system with a panel, a small battery, LED lights and a phone charger costs tens of dollars and reaches tier 1 access with no infrastructure at all. Around 200 million people now use them, largely paid for through mobile-money instalments - the pay-as-you-go model, which solved the financing problem as much as the technology solved the supply one.

Mini-grids sit between. A village-scale system with solar, batteries and often a diesel backup serves a few hundred connections and can support tier 3 to 4, which is enough for refrigeration, milling and small workshops. They are the fastest-growing segment because they reach the level where electricity starts generating income rather than only providing comfort.

The decentralised route is not universally better; grid connection remains cheaper per household in dense areas and supports the industrial loads that economies need. It is that the choice now exists, and for the most remote quarter of the unserved population it is the only realistic one this decade.

What It Would Actually Take

The energy quantities involved are strikingly small. Providing tier 3 access to everyone currently without it would require a fraction of a percent of global electricity generation. The reason it has not happened is not that the world lacks energy.

It is capital, and specifically the cost of capital. A solar mini-grid is almost entirely upfront expenditure with twenty years of low operating cost - the same profile as any capital-heavy technology, and therefore acutely sensitive to the discount rate. In countries where borrowing costs 15 to 20 percent, a project that would be comfortably viable in Europe at 4 percent is not viable at all. The technology is identical; the finance is not.

Institutions are the second constraint. Mini-grid developers need to know what happens if the national grid arrives in year six of a twenty-year investment. Tariff regulation, licensing and the rules for grid arrival are what determine whether private capital appears, and countries that settled those questions have seen far faster deployment than countries with better solar resources and unclear rules.

It is worth stating the moral arithmetic plainly, because it is frequently muddled. The 700 million people without electricity contribute a negligible share of global emissions, and giving all of them tier 3 access would add a fraction of a percent to world demand. Framing energy access as a climate trade-off is a category error: it is a development question whose solution happens, now, to be cheapest when it is clean. That is the argument this whole library ultimately serves - not that one technology should win, but that energy should be available, continuously, to everyone who does not yet have it.