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While dynamic tariffs can unlock short-term flexibility, they expose households to a risk\u2013reward trade-off. This paper quantifies how home battery storage reshapes the trade-off across residential energy services modeled with three different load types (elastic, interruptible and non-interruptible). Using load profiles from a German utility and an optimal-control scheduling framework under mixed dynamic tariffs, we evaluate cost and risk impacts over a range of storage sizes. Three results stand out. First, small batteries deliver most of the value: a capacity of about 20% of average daily demand captures roughly two-thirds of attainable savings while already lowering bill risk. Second, cost reduction potential is heterogeneous across devices:\n                    <jats:italic>Elastic loads profit the most from additional storage capacities<\/jats:italic>\n                    ; Non-interruptible and Interruptible loads profit less. Third, overall returns diminish and effectively plateau near a capacity of 60% of average daily demand. These findings offer actionable guidance: pair dynamic tariffs with modest storage to achieve substantial savings and risk reduction\u2014especially in low-flexibility or strongly market-aligned households\u2014and avoid over-investment in regards to diminishing returns.\n                  <\/jats:p>","DOI":"10.1186\/s42162-025-00602-9","type":"journal-article","created":{"date-parts":[[2026,1,31]],"date-time":"2026-01-31T03:17:28Z","timestamp":1769829448000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Risk and reward: evaluating household energy storage for optimizing demand-side flexibility under dynamic tariffs"],"prefix":"10.1186","volume":"9","author":[{"given":"Justus","family":"Ameling","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Robin Thomas","family":"Derzbach","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Gunther","family":"Gust","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Christoph Michael","family":"Flath","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2026,1,31]]},"reference":[{"key":"602_CR1","doi-asserted-by":"publisher","DOI":"10.1016\/j.eneco.2021.105774","volume":"106","author":"B Guo","year":"2022","unstructured":"Guo B, Weeks M (2022) Dynamic tariffs, demand response, and regulation in retail electricity markets. 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