S. 2235 would authorize the appropriation of $100 million for each of fiscal years 2026 through 2029 for the Environmental Protection Agency to provide grants and rebates to state, local, and tribal governments for programs that reduce emissions from diesel engines. In 2025, $90 million was appropriated for those purposes.
Assuming appropriation of the specified amounts and using historical spending patterns for those activities, CBO estimates that implementing the bill would cost $390 million over the 2026-2030 period and $10 million after 2030. The costs of the legislation, detailed in Table 1, fall within budget function 300 (natural resources and environment).
Table 1.
Estimated Increases in Spending Subject to Appropriation Under S. 2235
By Fiscal Year, Millions of Dollars
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2026-2030
2026-2035
Authorization
100
100
100
100
0
0
0
0
0
0
400
400
Estimated Outlays
30
90
100
100
70
10
0
0
0
0
390
400
The CBO staff contact for this estimate is Katherine Chou. The estimate was reviewed by H. Samuel Papenfuss, Deputy Director of Budget Analysis.
