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International Sustainable Energy Foundation

EIN 87-2509491Austin, TXEnvironmentLatest 990 FY2024

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Listed with the IRS. Every screen came back clear.

A 501(c)(3) on Publication 78 and the IRS master file.

A paid feature, included from the $75 plan up. Sign in to download.Checked Oct 15, 2026, 7:13 PM ET
IRS listing
Listed
Revocation
None
IRS files
Agree
Sanctions
No match
IRS bulletin
No notice
California
No record
Charity type
509(a)(1)

$30Mrevenue
FY2024
3staff
3 of 3years filed
’22’23’24
Revenue and spendingRevenueSpendingDeficit
$0$10M$20M$30M$40M’22’23’24
Against similar nonprofits FY2024
Operating margin−1.8%
Months of reserve14.2mo
Revenue growth (annualized)+11.4%
Middle half of peersMedianInternational Sustainable Energy
Where the money goes FY2024 · $31M spent
Programs$30M97%Management and general$357k1%Fundraising$439k1%990 FY2024 · Part IX line 25