Permanent Daylight Saving Time Would Cut Costs? Only Half That Story Is True
“Switching to daylight saving time permanently would reduce costs compared to twice-yearly clock switching”
The argument in brief
The claim is that locking clocks to daylight saving time permanently would save money compared to switching twice a year. The verdict is partially false. Ending the twice-yearly switch does eliminate real costs, but multiple studies show permanent DST specifically may actually raise energy bills and impose ongoing health costs — with sleep scientists recommending permanent standard time instead.
Why it spread
Changing the clocks is one of those universal annoyances almost everyone agrees on, which makes any permanent solution feel obviously better. It is easy to assume that if the switching is the problem, whichever time we land on must be fine — and since DST means more evening light, it feels like the natural winner. The distinction between ending transitions and choosing which time to keep permanently rarely makes it into the conversation.
The claim sounds straightforward: stop changing the clocks twice a year, save money. But it quietly bundles two separate questions together — whether ditching the biannual switch saves costs (likely yes), and whether permanent daylight saving time is the right fix (much less clear).
The costs of switching are real. Research published in an NBER Working Paper by Austin Smith found the spring transition is linked to more fatal traffic accidents and lost sleep. The Congressional Research Service confirmed in a 2019 report that the twice-yearly change carries measurable productivity and health costs. On that narrow point, the claim has merit.
But permanent DST is not the obvious solution. A landmark study in the American Economic Review by Kotchen and Grant examined Indiana households and found DST actually increased residential electricity costs by about 1% per year — roughly $3.19 extra per household annually. Research in the Journal of Environmental Economics and Management found that while DST cuts lighting use, heating and cooling costs often rise enough to wipe out any savings or push them negative, depending on where you live.
There is also a health cost that gets ignored. A 2019 review in Sleep Medicine Reviews by Roenneberg and colleagues found that permanent standard time — not DST — is what aligns best with human circadian biology. A Brookings Institution analysis of the Sunshine Protection Act echoed this, noting that permanent DST could impose year-round health and productivity penalties, especially for people living on the western edges of time zones, where the sun would rise very late in winter.
The bottom line: ending clock changes is a reasonable goal backed by evidence. But the evidence does not support permanent DST as the cost-saving version of that fix. If anything, the research points toward permanent standard time as the healthier and potentially cheaper choice. Watch for arguments that treat 'stop switching clocks' and 'make DST permanent' as the same thing — they are not.
Sources
- American Economic Review – Kotchen & Grant (2011)
Study of Indiana found that DST actually increased residential electricity costs by about 1% annually, costing households roughly $3.19 more per year, contradicting the assumption that DST saves energy.
- Journal of Environmental Economics and Management – Sexton et al.
Research found that while lighting energy use decreases under DST, heating and cooling costs often increase, making net energy savings negligible or negative depending on climate.
- Congressional Research Service – Daylight Saving Time Report (2019)
CRS found that evidence for energy savings from DST is mixed and inconclusive; some studies show modest savings while others show net costs, and the twice-yearly switching itself has measurable productivity and health costs.
- Sleep Medicine Reviews – Roenneberg et al. (2019)
Permanent standard time (not DST) is recommended by sleep scientists as more aligned with human circadian biology, suggesting permanent DST could impose ongoing health costs not present under standard time.
- Brookings Institution – Analysis of Sunshine Protection Act
Economists and health researchers note that permanent DST would eliminate transition costs but could impose year-round health and productivity costs due to misalignment with solar time, particularly in western edges of time zones.
- NBER Working Paper – Austin Smith (2016)
Found that the spring transition to DST is associated with increased fatal traffic accidents and reduced sleep, suggesting real costs from the twice-yearly switch, but these would be eliminated by any permanent time regime, not specifically permanent DST.
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