diff --git a/specs/electra/beacon-chain.md b/specs/electra/beacon-chain.md
index 44949a6408..6c6a63d89c 100644
--- a/specs/electra/beacon-chain.md
+++ b/specs/electra/beacon-chain.md
@@ -59,6 +59,7 @@
     - [New `get_active_balance`](#new-get_active_balance)
     - [New `get_pending_balance_to_withdraw`](#new-get_pending_balance_to_withdraw)
     - [Modified `get_attesting_indices`](#modified-get_attesting_indices)
+    - [Modified `get_next_sync_committee_indices`](#modified-get_next_sync_committee_indices)
   - [Beacon state mutators](#beacon-state-mutators)
     - [Updated  `initiate_validator_exit`](#updated--initiate_validator_exit)
     - [New `switch_to_compounding_validator`](#new-switch_to_compounding_validator)
@@ -127,8 +128,6 @@ The following values are (non-configurable) constants used throughout the specif
 
 | Name | Value |
 | - | - |
-| `BLS_WITHDRAWAL_PREFIX` | `Bytes1('0x00')` |
-| `ETH1_ADDRESS_WITHDRAWAL_PREFIX` | `Bytes1('0x01')` |
 | `COMPOUNDING_WITHDRAWAL_PREFIX` | `Bytes1('0x02')` |
 
 ### Domains
@@ -441,6 +440,8 @@ class BeaconState(Container):
 
 #### Updated `compute_proposer_index`
 
+*Note*: The function is modified to use `MAX_EFFECTIVE_BALANCE_ELECTRA` preset.
+
 ```python
 def compute_proposer_index(state: BeaconState, indices: Sequence[ValidatorIndex], seed: Bytes32) -> ValidatorIndex:
     """
@@ -624,6 +625,36 @@ def get_attesting_indices(state: BeaconState, attestation: Attestation) -> Set[V
     return output
 ```
 
+#### Modified `get_next_sync_committee_indices`
+
+*Note*: The function is modified to use `MAX_EFFECTIVE_BALANCE_ELECTRA` preset.
+
+```python
+def get_next_sync_committee_indices(state: BeaconState) -> Sequence[ValidatorIndex]:
+    """
+    Return the sync committee indices, with possible duplicates, for the next sync committee.
+    """
+    epoch = Epoch(get_current_epoch(state) + 1)
+
+    MAX_RANDOM_BYTE = 2**8 - 1
+    active_validator_indices = get_active_validator_indices(state, epoch)
+    active_validator_count = uint64(len(active_validator_indices))
+    seed = get_seed(state, epoch, DOMAIN_SYNC_COMMITTEE)
+    i = 0
+    sync_committee_indices: List[ValidatorIndex] = []
+    while len(sync_committee_indices) < SYNC_COMMITTEE_SIZE:
+        shuffled_index = compute_shuffled_index(uint64(i % active_validator_count), active_validator_count, seed)
+        candidate_index = active_validator_indices[shuffled_index]
+        random_byte = hash(seed + uint_to_bytes(uint64(i // 32)))[i % 32]
+        effective_balance = state.validators[candidate_index].effective_balance
+        # [Modified in Electra:EIP7251]
+        if effective_balance * MAX_RANDOM_BYTE >= MAX_EFFECTIVE_BALANCE_ELECTRA * random_byte:
+            sync_committee_indices.append(candidate_index)
+        i += 1
+    return sync_committee_indices
+```
+
+
 ### Beacon state mutators
 
 #### Updated  `initiate_validator_exit`
@@ -1409,8 +1440,10 @@ def initialize_beacon_state_from_eth1(eth1_block_hash: Hash32,
     # Process activations
     for index, validator in enumerate(state.validators):
         balance = state.balances[index]
-        validator.effective_balance = min(balance - balance % EFFECTIVE_BALANCE_INCREMENT, MAX_EFFECTIVE_BALANCE)
-        if validator.effective_balance == MAX_EFFECTIVE_BALANCE:
+        # [Modified in Electra:EIP7251]
+        validator.effective_balance = min(
+            balance - balance % EFFECTIVE_BALANCE_INCREMENT, get_validator_max_effective_balance(validator))
+        if validator.effective_balance >= MIN_ACTIVATION_BALANCE:
             validator.activation_eligibility_epoch = GENESIS_EPOCH
             validator.activation_epoch = GENESIS_EPOCH
 
diff --git a/tests/core/pyspec/eth2spec/test/altair/block_processing/sync_aggregate/test_process_sync_aggregate.py b/tests/core/pyspec/eth2spec/test/altair/block_processing/sync_aggregate/test_process_sync_aggregate.py
index 37e4439eea..f1a270092c 100644
--- a/tests/core/pyspec/eth2spec/test/altair/block_processing/sync_aggregate/test_process_sync_aggregate.py
+++ b/tests/core/pyspec/eth2spec/test/altair/block_processing/sync_aggregate/test_process_sync_aggregate.py
@@ -24,6 +24,11 @@
     with_presets,
     spec_state_test,
     always_bls,
+    single_phase,
+    with_custom_state,
+    spec_test,
+    default_balances_electra,
+    default_activation_threshold,
 )
 
 
@@ -143,7 +148,9 @@ def is_duplicate_sync_committee(committee_indices):
 
 @with_altair_and_later
 @with_presets([MINIMAL], reason="to create nonduplicate committee")
-@spec_state_test
+@spec_test
+@with_custom_state(balances_fn=default_balances_electra, threshold_fn=default_activation_threshold)
+@single_phase
 def test_sync_committee_rewards_nonduplicate_committee(spec, state):
     committee_indices = compute_committee_indices(state)
 
diff --git a/tests/core/pyspec/eth2spec/test/altair/block_processing/sync_aggregate/test_process_sync_aggregate_random.py b/tests/core/pyspec/eth2spec/test/altair/block_processing/sync_aggregate/test_process_sync_aggregate_random.py
index a402e3d540..792bcb0e33 100644
--- a/tests/core/pyspec/eth2spec/test/altair/block_processing/sync_aggregate/test_process_sync_aggregate_random.py
+++ b/tests/core/pyspec/eth2spec/test/altair/block_processing/sync_aggregate/test_process_sync_aggregate_random.py
@@ -24,6 +24,8 @@
     with_custom_state,
     with_presets,
     spec_test,
+    default_balances_electra,
+    misc_balances_electra,
 )
 
 
@@ -132,7 +134,9 @@ def test_random_with_exits_with_duplicates(spec, state):
 
 @with_altair_and_later
 @with_presets([MINIMAL], reason="to create nonduplicate committee")
-@spec_state_test
+@spec_test
+@with_custom_state(balances_fn=default_balances_electra, threshold_fn=default_activation_threshold)
+@single_phase
 def test_random_only_one_participant_without_duplicates(spec, state):
     rng = random.Random(501)
     yield from _test_harness_for_randomized_test_case(
@@ -144,7 +148,9 @@ def test_random_only_one_participant_without_duplicates(spec, state):
 
 @with_altair_and_later
 @with_presets([MINIMAL], reason="to create nonduplicate committee")
-@spec_state_test
+@spec_test
+@with_custom_state(balances_fn=default_balances_electra, threshold_fn=default_activation_threshold)
+@single_phase
 def test_random_low_participation_without_duplicates(spec, state):
     rng = random.Random(601)
     yield from _test_harness_for_randomized_test_case(
@@ -156,7 +162,9 @@ def test_random_low_participation_without_duplicates(spec, state):
 
 @with_altair_and_later
 @with_presets([MINIMAL], reason="to create nonduplicate committee")
-@spec_state_test
+@spec_test
+@with_custom_state(balances_fn=default_balances_electra, threshold_fn=default_activation_threshold)
+@single_phase
 def test_random_high_participation_without_duplicates(spec, state):
     rng = random.Random(701)
     yield from _test_harness_for_randomized_test_case(
@@ -168,7 +176,9 @@ def test_random_high_participation_without_duplicates(spec, state):
 
 @with_altair_and_later
 @with_presets([MINIMAL], reason="to create nonduplicate committee")
-@spec_state_test
+@spec_test
+@with_custom_state(balances_fn=default_balances_electra, threshold_fn=default_activation_threshold)
+@single_phase
 def test_random_all_but_one_participating_without_duplicates(spec, state):
     rng = random.Random(801)
     yield from _test_harness_for_randomized_test_case(
@@ -181,7 +191,7 @@ def test_random_all_but_one_participating_without_duplicates(spec, state):
 @with_altair_and_later
 @with_presets([MINIMAL], reason="to create nonduplicate committee")
 @spec_test
-@with_custom_state(balances_fn=misc_balances, threshold_fn=default_activation_threshold)
+@with_custom_state(balances_fn=misc_balances_electra, threshold_fn=default_activation_threshold)
 @single_phase
 def test_random_misc_balances_and_half_participation_without_duplicates(spec, state):
     rng = random.Random(1501)
@@ -194,7 +204,8 @@ def test_random_misc_balances_and_half_participation_without_duplicates(spec, st
 
 @with_altair_and_later
 @with_presets([MINIMAL], reason="to create nonduplicate committee")
-@spec_state_test
+@spec_test
+@with_custom_state(balances_fn=default_balances_electra, threshold_fn=default_activation_threshold)
 @single_phase
 def test_random_with_exits_without_duplicates(spec, state):
     rng = random.Random(1502)
diff --git a/tests/core/pyspec/eth2spec/test/context.py b/tests/core/pyspec/eth2spec/test/context.py
index ff2ab80b5c..e805e1c120 100644
--- a/tests/core/pyspec/eth2spec/test/context.py
+++ b/tests/core/pyspec/eth2spec/test/context.py
@@ -16,7 +16,7 @@
     ALLOWED_TEST_RUNNER_FORKS,
     LIGHT_CLIENT_TESTING_FORKS,
 )
-from .helpers.forks import is_post_fork
+from .helpers.forks import is_post_fork, is_post_electra
 from .helpers.genesis import create_genesis_state
 from .helpers.typing import (
     Spec,
@@ -86,7 +86,10 @@ def default_activation_threshold(spec: Spec):
     Helper method to use the default balance activation threshold for state creation for tests.
     Usage: `@with_custom_state(threshold_fn=default_activation_threshold, ...)`
     """
-    return spec.MAX_EFFECTIVE_BALANCE
+    if is_post_electra(spec):
+        return spec.MIN_ACTIVATION_BALANCE
+    else:
+        return spec.MAX_EFFECTIVE_BALANCE
 
 
 def zero_activation_threshold(spec: Spec):
@@ -106,6 +109,18 @@ def default_balances(spec: Spec):
     return [spec.MAX_EFFECTIVE_BALANCE] * num_validators
 
 
+def default_balances_electra(spec: Spec):
+    """
+    Helper method to create a series of default balances for Electra.
+    Usage: `@with_custom_state(balances_fn=default_balances_electra, ...)`
+    """
+    if not is_post_electra(spec):
+        return default_balances(spec)
+
+    num_validators = spec.SLOTS_PER_EPOCH * 8
+    return [spec.MAX_EFFECTIVE_BALANCE_ELECTRA] * num_validators
+
+
 def scaled_churn_balances_min_churn_limit(spec: Spec):
     """
     Helper method to create enough validators to scale the churn limit.
@@ -175,6 +190,21 @@ def misc_balances(spec: Spec):
     return balances
 
 
+def misc_balances_electra(spec: Spec):
+    """
+    Helper method to create a series of balances that includes some misc. balances for Electra.
+    Usage: `@with_custom_state(balances_fn=misc_balances, ...)`
+    """
+    if not is_post_electra(spec):
+        return misc_balances(spec)
+
+    num_validators = spec.SLOTS_PER_EPOCH * 8
+    balances = [spec.MAX_EFFECTIVE_BALANCE_ELECTRA * 2 * i // num_validators for i in range(num_validators)]
+    rng = Random(1234)
+    rng.shuffle(balances)
+    return balances
+
+
 def misc_balances_in_default_range_with_many_validators(spec: Spec):
     """
     Helper method to create a series of balances that includes some misc. balances but
diff --git a/tests/core/pyspec/eth2spec/test/helpers/genesis.py b/tests/core/pyspec/eth2spec/test/helpers/genesis.py
index 3896b41731..ab274b7573 100644
--- a/tests/core/pyspec/eth2spec/test/helpers/genesis.py
+++ b/tests/core/pyspec/eth2spec/test/helpers/genesis.py
@@ -15,8 +15,23 @@
 def build_mock_validator(spec, i: int, balance: int):
     active_pubkey = pubkeys[i]
     withdrawal_pubkey = pubkeys[-1 - i]
-    # insecurely use pubkey as withdrawal key as well
-    withdrawal_credentials = spec.BLS_WITHDRAWAL_PREFIX + spec.hash(withdrawal_pubkey)[1:]
+    if is_post_electra(spec):
+        if balance > spec.MIN_ACTIVATION_BALANCE:
+            # use compounding withdrawal credentials if the balance is higher than MIN_ACTIVATION_BALANCE
+            withdrawal_credentials = (
+                spec.COMPOUNDING_WITHDRAWAL_PREFIX
+                + b'\x00' * 11
+                + spec.hash(withdrawal_pubkey)[12:]
+            )
+        else:
+            # insecurely use pubkey as withdrawal key as well
+            withdrawal_credentials = spec.BLS_WITHDRAWAL_PREFIX + spec.hash(withdrawal_pubkey)[1:]
+        max_effective_balace = spec.MAX_EFFECTIVE_BALANCE_ELECTRA
+    else:
+        # insecurely use pubkey as withdrawal key as well
+        withdrawal_credentials = spec.BLS_WITHDRAWAL_PREFIX + spec.hash(withdrawal_pubkey)[1:]
+        max_effective_balace = spec.MAX_EFFECTIVE_BALANCE
+
     validator = spec.Validator(
         pubkey=active_pubkey,
         withdrawal_credentials=withdrawal_credentials,
@@ -24,7 +39,7 @@ def build_mock_validator(spec, i: int, balance: int):
         activation_epoch=spec.FAR_FUTURE_EPOCH,
         exit_epoch=spec.FAR_FUTURE_EPOCH,
         withdrawable_epoch=spec.FAR_FUTURE_EPOCH,
-        effective_balance=min(balance - balance % spec.EFFECTIVE_BALANCE_INCREMENT, spec.MAX_EFFECTIVE_BALANCE)
+        effective_balance=min(balance - balance % spec.EFFECTIVE_BALANCE_INCREMENT, max_effective_balace)
     )
 
     return validator
diff --git a/tests/core/pyspec/eth2spec/test/phase0/genesis/test_initialization.py b/tests/core/pyspec/eth2spec/test/phase0/genesis/test_initialization.py
index 4c7c5f28c0..ed584ed612 100644
--- a/tests/core/pyspec/eth2spec/test/phase0/genesis/test_initialization.py
+++ b/tests/core/pyspec/eth2spec/test/phase0/genesis/test_initialization.py
@@ -11,6 +11,7 @@
 )
 from eth2spec.test.helpers.forks import (
     is_post_altair,
+    is_post_electra,
 )
 
 
@@ -69,9 +70,14 @@ def test_initialize_beacon_state_some_small_balances(spec):
     if is_post_altair(spec):
         yield 'description', 'meta', get_post_altair_description(spec)
 
+    if is_post_electra(spec):
+        max_effective_balance = spec.MAX_EFFECTIVE_BALANCE_ELECTRA
+    else:
+        max_effective_balance = spec.MAX_EFFECTIVE_BALANCE
+
     main_deposit_count = spec.config.MIN_GENESIS_ACTIVE_VALIDATOR_COUNT
     main_deposits, _, deposit_data_list = prepare_full_genesis_deposits(
-        spec, spec.MAX_EFFECTIVE_BALANCE,
+        spec, max_effective_balance,
         deposit_count=main_deposit_count, signed=True,
     )
     # For deposits above, and for another deposit_count, add a balance of EFFECTIVE_BALANCE_INCREMENT
@@ -99,6 +105,8 @@ def test_initialize_beacon_state_some_small_balances(spec):
     assert state.eth1_data.deposit_count == len(deposits)
     assert state.eth1_data.block_hash == eth1_block_hash
     # only main deposits participate to the active balance
+    # NOTE: they are pre-ELECTRA deposits with BLS_WITHDRAWAL_PREFIX,
+    # so `MAX_EFFECTIVE_BALANCE` is used
     assert spec.get_total_active_balance(state) == main_deposit_count * spec.MAX_EFFECTIVE_BALANCE
 
     # yield state