As　a　flexible　regulatory　resource　with　both　generation　and　user　attributes,　energy　storage　plays　a　strategically　important　role　in　the　construction　of　new　power　systems.　In　recent　years,　it　has　been　widely　used　on　both　the　generation　and　user　sides.　However,　the　rapid　expansion　of　energy　storage　projects　is　accompanied　by　challenges　such　as　the　lack　of　viable　business　modes　and　limited　profit　channels,　leading　to　idle　storage　devices　and　difficulties　in　investment　recovery　on　both　the　generation　and　user　sides,　which　hinder　the　long-term　development　of　the　energy　storage　industry.　Shared　energy　storage,　as　a　novel　business　mode,　has　emerged　as　a　key　pathway　to　promote　the　marketization　of　energy　storage.　Hence,　this　paper　first　reviews　the　domestic　and　international　support　policies　for　energy　storage　and　shared　energy　storage.　Then,　from　the　perspectives　of　three　shared　energy　storage　business　modes,　i.e.,　co-construction,　interaction,　and　lease,　the　development　status　of　key　technologies　and　domestic　and　international　implementation　practices　related　to　shared　energy　storage　business　modes　on　both　the　generation　and　user　sides　over　the　past　decade　is　comprehensively　reviewed.　Finally,　the　key　challenges　faced　by　the　current　shared　energy　storage　business　modes　in　areas　such　as　the　scale　of　cooperative　entities,　partner　matching　and　multi-market　rules　are　summarized,　and　the　future　research　directions　of　shared　energy　storage　business　modes　on　both　the　generation　and　user　sides　in　new　power　systems　are　prospected.　©　2025　Automation　of　Electric　Power　Systems　Press.　All　rights　reserved.