Sao Paulo, Brazil
#00170
Case study of
#00182 Transparent emergency demand management: dashboards, escalating tariffs, pressure management and a communicated deadline
Implementer
Sabesp (state water utility) and the State of Sao Paulo
Timeline
Jan 1, 2014 – Dec 31, 2016
Location
Description
During the 2014–2015 Cantareira reservoir crisis, Sabesp implemented a bonus tariff offering a 30% bill discount to households that cut consumption by 20% or more. This reward-framed instrument achieved a 25–27% demand reduction. In parallel, Sabesp ran covert nighttime pressure reductions that functioned as de facto rationing while publicly denying any rationing was occurring during the 2014 election campaign. The Cantareira system fell to 12.5% capacity, after which the utility pumped an undisclosed dead volume below the normal intake level. Unacknowledged pressure cuts fell hardest on poor peripheral districts, where low pressure fails first at network edges and heights.
Metrics
2Funding
Lessons learned
- Reward-framed tariffs (a bonus for saving) achieved higher political acceptance than penalty tariffs and drove a 25–27% demand cut; replicators should consider bonus structures where penalty tariffs face legal or political barriers.
- Covert nighttime pressure reductions denied as rationing shifted burden onto poor peripheral districts and destroyed public trust; any pressure management must be disclosed with explicit geographic equity mapping.
- Electoral timing is a structural risk: the incentive to deny a crisis during a campaign directly undermines demand management; crisis protocols should be insulated from electoral calendars through independent utility governance or pre-committed trigger rules.
Documented Jul 24, 2026