diff --git a/ydb/core/persqueue/partition.cpp b/ydb/core/persqueue/partition.cpp
index a26171cc45ba..8b4384b5f0eb 100644
--- a/ydb/core/persqueue/partition.cpp
+++ b/ydb/core/persqueue/partition.cpp
@@ -245,7 +245,7 @@ void TPartition::EmplaceResponse(TMessage&& message, const TActorContext& ctx) {
     );
 }
 
-ui64 TPartition::MeteringDataSize() const {
+ui64 TPartition::UserDataSize() const {
     if (DataKeysBody.size() <= 1) {
         // tiny optimization - we do not meter very small queues up to 16MB
         return 0;
@@ -260,25 +260,39 @@ ui64 TPartition::MeteringDataSize() const {
     return size >= lastBlobSize ? size - lastBlobSize : 0;
 }
 
+ui64 TPartition::MeteringDataSize(TInstant now) const {
+    if (IsActive() || NKikimrPQ::TPQTabletConfig::METERING_MODE_REQUEST_UNITS == Config.GetMeteringMode()) {
+        return UserDataSize();
+    } else {
+        // We only add the amount of data that is blocked by an important consumer.
+        ui64 size = 0;
+        auto expirationTimestamp = now - TDuration::Seconds(Config.GetPartitionConfig().GetLifetimeSeconds()) - WAKE_TIMEOUT;
+        for (size_t i = 1; i < DataKeysBody.size() && DataKeysBody[i].Timestamp < expirationTimestamp; ++i) {
+            size += DataKeysBody[i].Size;
+        }
+        return size;
+    }
+}
+
 ui64 TPartition::ReserveSize() const {
-    return TopicPartitionReserveSize(Config);
+    return IsActive() ? TopicPartitionReserveSize(Config) : 0;
 }
 
 ui64 TPartition::StorageSize(const TActorContext&) const {
-    return std::max<ui64>(MeteringDataSize(), ReserveSize());
+    return std::max<ui64>(UserDataSize(), ReserveSize());
 }
 
 ui64 TPartition::UsedReserveSize(const TActorContext&) const {
-    return std::min<ui64>(MeteringDataSize(), ReserveSize());
+    return std::min<ui64>(UserDataSize(), ReserveSize());
 }
 
 ui64 TPartition::GetUsedStorage(const TInstant& now) {
     const auto duration = now - LastUsedStorageMeterTimestamp;
     LastUsedStorageMeterTimestamp = now;
 
-    auto dataSize = MeteringDataSize();
+    auto dataSize = MeteringDataSize(now);
     auto reservedSize = ReserveSize();
-    ui64 size = dataSize > reservedSize ? dataSize - reservedSize : 0;
+    auto size = dataSize > reservedSize ? dataSize - reservedSize : 0;
     return size * duration.MilliSeconds() / 1000 / 1_MB; // mb*seconds
 }
 
@@ -749,7 +763,7 @@ void TPartition::Handle(TEvPQ::TEvPartitionStatus::TPtr& ev, const TActorContext
 
         result.SetReadBytesQuota(maxQuota);
 
-        result.SetPartitionSize(MeteringDataSize());
+        result.SetPartitionSize(UserDataSize());
         result.SetUsedReserveSize(UsedReserveSize(ctx));
 
         result.SetLastWriteTimestampMs(WriteTimestamp.MilliSeconds());
diff --git a/ydb/core/persqueue/partition.h b/ydb/core/persqueue/partition.h
index 8be4308842af..e45dcd6def1a 100644
--- a/ydb/core/persqueue/partition.h
+++ b/ydb/core/persqueue/partition.h
@@ -457,7 +457,9 @@ class TPartition : public TActorBootstrapped<TPartition> {
     }
 
     // The size of the data realy was persisted in the storage by the partition
-    ui64 MeteringDataSize() const;
+    ui64 UserDataSize() const;
+    // The size of the data was metered to user
+    ui64 MeteringDataSize(TInstant now) const;
     // The size of the storage that was reserved by the partition
     ui64 ReserveSize() const;
     // The size of the storage that usud by the partition. That included combination of the reserver and realy persisted data.
@@ -951,4 +953,3 @@ class TPartition : public TActorBootstrapped<TPartition> {
 };
 
 } // namespace NKikimr::NPQ
-
diff --git a/ydb/core/persqueue/partition_write.cpp b/ydb/core/persqueue/partition_write.cpp
index e0346e2f9010..2cb1f0664618 100644
--- a/ydb/core/persqueue/partition_write.cpp
+++ b/ydb/core/persqueue/partition_write.cpp
@@ -1764,7 +1764,7 @@ bool TPartition::WaitingForSubDomainQuota(const TActorContext& /*ctx*/, const ui
         return withSize > 0 || Size() > 0;
     }
 
-    return MeteringDataSize() + withSize > ReserveSize();
+    return UserDataSize() + withSize > ReserveSize();
 }
 
 void TPartition::RequestBlobQuota(size_t quotaSize)
diff --git a/ydb/core/persqueue/pq_impl.cpp b/ydb/core/persqueue/pq_impl.cpp
index 52a59d047da5..f86b619bbaf8 100644
--- a/ydb/core/persqueue/pq_impl.cpp
+++ b/ydb/core/persqueue/pq_impl.cpp
@@ -1171,7 +1171,6 @@ void TPersQueue::InitializeMeteringSink(const TActorContext& ctx) {
         return result;
     };
 
-
     MeteringSink.Create(ctx.Now(), {
             .FlushInterval  = TDuration::Seconds(pqConfig.GetBillingMeteringConfig().GetFlushIntervalSec()),
             .TabletId       = ToString(TabletID()),
@@ -1180,7 +1179,7 @@ void TPersQueue::InitializeMeteringSink(const TActorContext& ctx) {
             .YdbDatabaseId  = Config.GetYdbDatabaseId(),
             .StreamName     = streamName,
             .ResourceId     = streamPath,
-            .PartitionsSize = Config.PartitionsSize(),
+            .PartitionsSize = CountActivePartitions(Config.GetPartitions()),
             .WriteQuota     = Config.GetPartitionConfig().GetWriteSpeedInBytesPerSecond(),
             .ReservedSpace  = storageLimitBytes,
             .ConsumersCount = countReadRulesWithPricing(ctx, Config),
diff --git a/ydb/core/persqueue/utils.cpp b/ydb/core/persqueue/utils.cpp
index 7d4ad4698cbe..828e20cfbec0 100644
--- a/ydb/core/persqueue/utils.cpp
+++ b/ydb/core/persqueue/utils.cpp
@@ -36,6 +36,12 @@ bool SplitMergeEnabled(const NKikimrPQ::TPQTabletConfig& config) {
     return config.has_partitionstrategy() && config.partitionstrategy().has_partitionstrategytype() && config.partitionstrategy().partitionstrategytype() != ::NKikimrPQ::TPQTabletConfig_TPartitionStrategyType::TPQTabletConfig_TPartitionStrategyType_DISABLED;
 }
 
+size_t CountActivePartitions(const ::google::protobuf::RepeatedPtrField< ::NKikimrPQ::TPQTabletConfig_TPartition >& partitions) {
+    return std::count_if(partitions.begin(), partitions.end(), [](const auto& p) {
+        return p.GetStatus() == ::NKikimrPQ::ETopicPartitionStatus::Active;
+    });
+}
+
 static constexpr ui64 PUT_UNIT_SIZE = 40960u; // 40Kb
 
 ui64 PutUnitsSize(const ui64 size) {
diff --git a/ydb/core/persqueue/utils.h b/ydb/core/persqueue/utils.h
index 55097d10c7d2..27373a851831 100644
--- a/ydb/core/persqueue/utils.h
+++ b/ydb/core/persqueue/utils.h
@@ -11,6 +11,8 @@ ui64 TopicPartitionReserveThroughput(const NKikimrPQ::TPQTabletConfig& config);
 
 bool SplitMergeEnabled(const NKikimrPQ::TPQTabletConfig& config);
 
+size_t CountActivePartitions(const ::google::protobuf::RepeatedPtrField< ::NKikimrPQ::TPQTabletConfig_TPartition >& partitions);
+
 ui64 PutUnitsSize(const ui64 size);
 
 TString SourceIdHash(const TString& sourceId);
diff --git a/ydb/core/tx/schemeshard/schemeshard__init.cpp b/ydb/core/tx/schemeshard/schemeshard__init.cpp
index 0b77b71a9656..3082db929199 100644
--- a/ydb/core/tx/schemeshard/schemeshard__init.cpp
+++ b/ydb/core/tx/schemeshard/schemeshard__init.cpp
@@ -2475,8 +2475,12 @@ struct TSchemeShard::TTxInit : public TTransactionBase<TSchemeShard> {
                 Y_ABORT_UNLESS(it != Self->Topics.end());
                 Y_ABORT_UNLESS(it->second);
                 TTopicInfo::TPtr pqGroup = it->second;
-                if (pqInfo->AlterVersion <= pqGroup->AlterVersion)
+                if (pqInfo->AlterVersion <= pqGroup->AlterVersion) {
                     ++pqGroup->TotalPartitionCount;
+                    if (pqInfo->Status == NKikimrPQ::ETopicPartitionStatus::Active) {
+                        ++pqGroup->ActivePartitionCount;
+                    }
+                }
                 if (pqInfo->PqId >= pqGroup->NextPartitionId) {
                     pqGroup->NextPartitionId = pqInfo->PqId + 1;
                     pqGroup->TotalGroupCount = pqInfo->PqId + 1;
@@ -4058,7 +4062,9 @@ struct TSchemeShard::TTxInit : public TTransactionBase<TSchemeShard> {
 
             if (path->IsPQGroup()) {
                 auto pqGroup = Self->Topics.at(path->PathId);
-                auto delta = pqGroup->AlterData ? pqGroup->AlterData->TotalPartitionCount : pqGroup->TotalPartitionCount;
+                auto partitionDelta = pqGroup->AlterData ? pqGroup->AlterData->TotalPartitionCount : pqGroup->TotalPartitionCount;
+                auto activePartitionDelta = pqGroup->AlterData ? pqGroup->AlterData->ActivePartitionCount : pqGroup->ActivePartitionCount;
+
                 auto tabletConfig = pqGroup->AlterData ? (pqGroup->AlterData->TabletConfig.empty() ? pqGroup->TabletConfig : pqGroup->AlterData->TabletConfig)
                                                        : pqGroup->TabletConfig;
                 NKikimrPQ::TPQTabletConfig config;
@@ -4066,12 +4072,12 @@ struct TSchemeShard::TTxInit : public TTransactionBase<TSchemeShard> {
                 bool parseOk = ParseFromStringNoSizeLimit(config, tabletConfig);
                 Y_ABORT_UNLESS(parseOk);
 
-                const PQGroupReserve reserve(config, delta);
+                const PQGroupReserve reserve(config, activePartitionDelta);
 
-                inclusiveDomainInfo->IncPQPartitionsInside(delta);
+                inclusiveDomainInfo->IncPQPartitionsInside(partitionDelta);
                 inclusiveDomainInfo->IncPQReservedStorage(reserve.Storage);
 
-                Self->TabletCounters->Simple()[COUNTER_STREAM_SHARDS_COUNT].Add(delta);
+                Self->TabletCounters->Simple()[COUNTER_STREAM_SHARDS_COUNT].Add(partitionDelta);
                 Self->TabletCounters->Simple()[COUNTER_STREAM_RESERVED_THROUGHPUT].Add(reserve.Throughput);
                 Self->TabletCounters->Simple()[COUNTER_STREAM_RESERVED_STORAGE].Add(reserve.Storage);
             }
diff --git a/ydb/core/tx/schemeshard/schemeshard__operation_alter_pq.cpp b/ydb/core/tx/schemeshard/schemeshard__operation_alter_pq.cpp
index dac4b58742ce..1c28386c9b82 100644
--- a/ydb/core/tx/schemeshard/schemeshard__operation_alter_pq.cpp
+++ b/ydb/core/tx/schemeshard/schemeshard__operation_alter_pq.cpp
@@ -577,6 +577,8 @@ class TAlterPQ: public TSubOperation {
             return result;
         }
 
+        alterData->ActivePartitionCount = topic->ActivePartitionCount;
+
         bool splitMergeEnabled = AppData()->FeatureFlags.GetEnableTopicSplitMerge()
                 && NKikimr::NPQ::SplitMergeEnabled(tabletConfig)
                 && NKikimr::NPQ::SplitMergeEnabled(newTabletConfig);
@@ -593,6 +595,7 @@ class TAlterPQ: public TSubOperation {
 
             for (const auto& split : alter.GetSplit()) {
                 alterData->TotalGroupCount += 2;
+                ++alterData->ActivePartitionCount;
 
                 const auto splittedPartitionId = split.GetPartition();
                 if (!topic->Partitions.contains(splittedPartitionId)) {
@@ -654,6 +657,7 @@ class TAlterPQ: public TSubOperation {
             }
             for (const auto& merge : alter.GetMerge()) {
                 alterData->TotalGroupCount += 1;
+                --alterData->ActivePartitionCount;
 
                 const auto partitionId = merge.GetPartition();
                 if (!topic->Partitions.contains(partitionId)) {
@@ -737,6 +741,10 @@ class TAlterPQ: public TSubOperation {
         }
 
         alterData->TotalPartitionCount = topic->TotalPartitionCount + alterData->PartitionsToAdd.size();
+        if (!splitMergeEnabled) {
+            alterData->ActivePartitionCount = alterData->TotalPartitionCount;
+        }
+
         alterData->NextPartitionId = topic->NextPartitionId;
         for (const auto& p : alterData->PartitionsToAdd) {
             if (p.GroupId == 0 || p.GroupId > alterData->TotalGroupCount) {
@@ -780,8 +788,8 @@ class TAlterPQ: public TSubOperation {
             return result;
         }
 
-        const PQGroupReserve reserve(newTabletConfig, alterData->TotalPartitionCount);
-        const PQGroupReserve oldReserve(tabletConfig, topic->TotalPartitionCount);
+        const PQGroupReserve reserve(newTabletConfig, alterData->ActivePartitionCount);
+        const PQGroupReserve oldReserve(tabletConfig, topic->ActivePartitionCount);
 
         const ui64 storageToReserve = reserve.Storage > oldReserve.Storage ? reserve.Storage - oldReserve.Storage : 0;
 
diff --git a/ydb/core/tx/schemeshard/schemeshard__operation_create_pq.cpp b/ydb/core/tx/schemeshard/schemeshard__operation_create_pq.cpp
index a83c459588bd..4cd1303a1fa3 100644
--- a/ydb/core/tx/schemeshard/schemeshard__operation_create_pq.cpp
+++ b/ydb/core/tx/schemeshard/schemeshard__operation_create_pq.cpp
@@ -155,6 +155,7 @@ TTopicInfo::TPtr CreatePersQueueGroup(TOperationContext& context,
 
     pqGroupInfo->TotalGroupCount = partitionCount;
     pqGroupInfo->TotalPartitionCount = partitionCount;
+    pqGroupInfo->ActivePartitionCount = partitionCount;
 
     ui32 tabletCount = pqGroupInfo->ExpectedShardCount();
     if (tabletCount > TSchemeShard::MaxPQGroupTabletsCount) {
diff --git a/ydb/core/tx/schemeshard/schemeshard__operation_drop_pq.cpp b/ydb/core/tx/schemeshard/schemeshard__operation_drop_pq.cpp
index 70d663c713eb..5e4f9ca67177 100644
--- a/ydb/core/tx/schemeshard/schemeshard__operation_drop_pq.cpp
+++ b/ydb/core/tx/schemeshard/schemeshard__operation_drop_pq.cpp
@@ -183,7 +183,7 @@ class TPropose: public TSubOperationState {
         bool parseOk = ParseFromStringNoSizeLimit(config, tabletConfig);
         Y_ABORT_UNLESS(parseOk);
 
-        const PQGroupReserve reserve(config, pqGroup->TotalPartitionCount);
+        const PQGroupReserve reserve(config, pqGroup->ActivePartitionCount);
 
         auto domainInfo = context.SS->ResolveDomainInfo(pathId);
         domainInfo->DecPathsInside();
diff --git a/ydb/core/tx/schemeshard/schemeshard_info_types.h b/ydb/core/tx/schemeshard/schemeshard_info_types.h
index 938107d12c6b..4eb70beac9c8 100644
--- a/ydb/core/tx/schemeshard/schemeshard_info_types.h
+++ b/ydb/core/tx/schemeshard/schemeshard_info_types.h
@@ -1126,6 +1126,7 @@ struct TTopicInfo : TSimpleRefCount<TTopicInfo> {
     TTabletId BalancerTabletID = InvalidTabletId;
     TShardIdx BalancerShardIdx = InvalidShardIdx;
     THashMap<ui32, TTopicTabletInfo::TTopicPartitionInfo*> Partitions;
+    size_t ActivePartitionCount = 0;
 
     TString PreSerializedPathDescription; // Cached path description
     TString PreSerializedPartitionsDescription; // Cached partition description
@@ -1222,6 +1223,7 @@ struct TTopicInfo : TSimpleRefCount<TTopicInfo> {
         alterData->AlterVersion = AlterVersion + 1;
         Y_ABORT_UNLESS(alterData->TotalGroupCount);
         Y_ABORT_UNLESS(alterData->TotalPartitionCount);
+        Y_ABORT_UNLESS(0 < alterData->ActivePartitionCount && alterData->ActivePartitionCount <= alterData->TotalPartitionCount);
         Y_ABORT_UNLESS(alterData->NextPartitionId);
         Y_ABORT_UNLESS(alterData->MaxPartsPerTablet);
         alterData->KeySchema = KeySchema;
@@ -1235,6 +1237,7 @@ struct TTopicInfo : TSimpleRefCount<TTopicInfo> {
         TotalGroupCount = AlterData->TotalGroupCount;
         NextPartitionId = AlterData->NextPartitionId;
         TotalPartitionCount = AlterData->TotalPartitionCount;
+        ActivePartitionCount = AlterData->ActivePartitionCount;
         MaxPartsPerTablet = AlterData->MaxPartsPerTablet;
         if (!AlterData->TabletConfig.empty())
             TabletConfig = std::move(AlterData->TabletConfig);
@@ -3275,7 +3278,7 @@ bool ValidateTtlSettings(const NKikimrSchemeOp::TTTLSettings& ttl,
     const THashMap<TString, ui32>& colName2Id,
     const TSubDomainInfo& subDomain, TString& errStr);
 
-std::optional<std::pair<i64, i64>> ValidateSequenceType(const TString& sequenceName, const TString& dataType, 
+std::optional<std::pair<i64, i64>> ValidateSequenceType(const TString& sequenceName, const TString& dataType,
     const NKikimr::NScheme::TTypeRegistry& typeRegistry, bool pgTypesEnabled, TString& errStr);
 
 }
diff --git a/ydb/core/tx/schemeshard/ut_base/ut_base.cpp b/ydb/core/tx/schemeshard/ut_base/ut_base.cpp
index 5e85a674c428..5ce0598b4342 100644
--- a/ydb/core/tx/schemeshard/ut_base/ut_base.cpp
+++ b/ydb/core/tx/schemeshard/ut_base/ut_base.cpp
@@ -10125,7 +10125,7 @@ Y_UNIT_TEST_SUITE(TSchemeShardTest) {
                                               }, 100);
             UNIT_ASSERT_VALUES_EQUAL(splitKey, "(Uint64 : 0, Utf8 : a, Uint32 : 1)");
         }
-        
+
         {
             TString splitKey =
                     schemaHelper.FindSplitKey({
@@ -11072,6 +11072,74 @@ Y_UNIT_TEST_SUITE(TSchemeShardTest) {
         AssertReserve("/MyRoot/Topic2", 3 * 17);
     }
 
+    Y_UNIT_TEST(TopicWithAutopartitioningReserveSize) {
+        TTestEnvOptions opts;
+        opts.EnableTopicSplitMerge(true);
+        opts.EnablePQConfigTransactionsAtSchemeShard(true);
+
+        TTestBasicRuntime runtime;
+
+        TTestEnv env(runtime, opts);
+        ui64 txId = 100;
+
+        const auto AssertReserve = [&] (TString path, ui64 expectedReservedStorage) {
+            TestDescribeResult(DescribePath(runtime, path),
+                               {NLs::Finished,
+                                NLs::TopicReservedStorage(expectedReservedStorage)});
+        };
+
+        // create with WriteSpeedInBytesPerSecond
+        TestCreatePQGroup(runtime, ++txId, "/MyRoot", R"(
+            Name: "Topic1"
+            TotalGroupCount: 1
+            PartitionPerTablet: 1
+            PQTabletConfig {
+                PartitionConfig {
+                    LifetimeSeconds: 13
+                    WriteSpeedInBytesPerSecond : 19
+                }
+                MeteringMode: METERING_MODE_RESERVED_CAPACITY
+                PartitionStrategy {
+                    MinPartitionCount: 1
+                    MaxPartitionCount: 7
+                    PartitionStrategyType: CAN_SPLIT_AND_MERGE
+                }
+            }
+        )");
+        env.TestWaitNotification(runtime, txId);
+        AssertReserve("/MyRoot/Topic1", 1 * 13 * 19);
+
+        TestAlterPQGroup(runtime, ++txId, "/MyRoot", R"(
+            Name: "Topic1"
+            Split {
+                Partition: 0
+                SplitBoundary: 'A'
+            }
+        )");
+        env.TestWaitNotification(runtime, txId);
+        AssertReserve("/MyRoot/Topic1", 2 * 13 * 19); // There are only 2 active partitions
+
+        TestAlterPQGroup(runtime, ++txId, "/MyRoot", R"(
+            Name: "Topic1"
+            Split {
+                Partition: 1
+                SplitBoundary: '0'
+            }
+        )");
+        env.TestWaitNotification(runtime, txId);
+        AssertReserve("/MyRoot/Topic1", 3 * 13 * 19); // There are only 3 active partitions
+
+        TestAlterPQGroup(runtime, ++txId, "/MyRoot", R"(
+            Name: "Topic1"
+            Merge {
+                Partition: 2
+                AdjacentPartition: 4
+            }
+        )");
+        env.TestWaitNotification(runtime, txId);
+        AssertReserve("/MyRoot/Topic1", 2 * 13 * 19); // There are only 2 active partitions
+    }
+
     Y_UNIT_TEST(FindSubDomainPathId) {
         TTestBasicRuntime runtime;
         TTestEnv env(runtime);