The energy crisis requires more generation capability, and that is why the importance of the storage technologies increases. In the liberalized energy market the energy storage activity, this way of the ldquoenergy speculationrdquo is welcome. In this paper a small scale buy-sale optimization strategy is investigated. In the Budapest Tech a model has been built in the renewable energy park. The strategy could be realized in practice by our small scale pumped storage hydro plant, Fuel cell, wind turbine and PV system.